CN111819787A - Crystal calibration method, chip and bluetooth headset - Google Patents

Abstract

A method, a chip and a Bluetooth headset for crystal calibration are provided. The method comprises the following steps: obtaining a count difference of at least one pulse signal, the at least one pulse signal including a pulse signal generated by the crystal based on at least one parameter of a plurality of parameters, the count difference of each pulse signal of the at least one pulse signal being a difference between system tick count values based on the corresponding pulse signal obtained using two external interrupts triggered by a reference pulse signal; determining a target parameter based on the count difference of the at least one pulse signal; and determining the pulse signal generated based on the target parameter as the pulse signal after crystal calibration. The target parameter is determined through the counting difference value of the at least one pulse signal, so that the automatic calibration of the pulse signals can be realized, the labor cost is reduced, and the calibration efficiency is improved while the complexity of a calibration mechanism is reduced.

Description

Crystal calibration method, chip and bluetooth headset

technical field

The embodiments of the present application relate to the field of electronics, and more particularly, to a crystal calibration method, a chip, and a Bluetooth headset.

Background technique

When the single-chip microcomputer is running, it needs a pulse signal as the trigger signal to execute the instruction by itself. Usually, the pulse signal is generated by using a crystal connected to the application circuit of the single-chip microcomputer and an external capacitor connected to the crystal. The crystal has a nominal load capacitance value. When the load capacitance value is close to or equal to the real capacitance value of the external capacitor, the frequency of the pulse signal generated by the crystal is the most accurate.

However, the material parameters of the same batch will not be exactly the same. The fluctuation of material parameters will cause the load capacitance of the same batch of crystals produced by the same manufacturer, the capacitance of the same batch of external capacitors produced by the same manufacturer, and other product parameters will be within a certain range. The frequency of the pulse signal generated by the crystal is not accurate enough.

SUMMARY OF THE INVENTION

Provided are a crystal calibration method, a chip and a Bluetooth headset, which can realize automatic crystal calibration.

In a first aspect, a method for crystal calibration is provided, applicable to a chip having a crystal, the method comprising:

Obtaining a count difference value of at least one pulse signal, the at least one pulse signal including a pulse signal generated by the crystal based on at least one parameter in a plurality of parameters, and the count difference value of each pulse signal in the at least one pulse signal is Use the difference between the system tick count values based on the corresponding pulse signal obtained by two external interrupts triggered by the reference pulse signal;

determining a target parameter based on the count difference of the at least one pulse signal;

The pulse signal generated based on the target parameter is determined as the pulse signal after crystal calibration.

Determining the target parameter by the count difference of the at least one pulse signal can not only realize automatic calibration of the pulse signal and reduce labor costs, but also improve the calibration efficiency while reducing the complexity of the calibration mechanism.

In some possible implementation manners, the acquiring the count difference value of the at least one pulse signal includes:

The count difference value of the at least one pulse signal is obtained by using a dichotomy method.

Obtaining the count difference of at least one pulse signal through binary differentiation avoids acquiring the count difference of all pulse signals, reducing the total amount of count difference that needs to be obtained, which can improve the calibration efficiency while ensuring the calibration accuracy. Reduce time cost.

In some possible implementation manners, the obtaining the count difference value of the at least one pulse signal by using a dichotomy method includes:

Determine the minimum and maximum parameters among multiple parameters;

generating a first pulse signal and a second pulse signal based on the minimum parameter and the maximum parameter, respectively;

respectively acquiring the first count difference of the first pulse signal and the second count difference of the second pulse signal;

Wherein, determining the target parameter based on the count difference of the at least one pulse signal includes:

The target parameter is determined based on the first count difference and the second count difference.

In some possible implementation manners, the determining the target parameter based on the first count difference value and the second count difference value includes:

In the case that the average value of the first count difference value and the second count difference value is equal to the preset count difference value, the average value of the minimum parameter and the maximum parameter is determined as the target parameter.

In some possible implementation manners, the determining the target parameter based on the first count difference value and the second count difference value includes:

When the average value of the first count difference value and the second count difference value is greater than the preset count difference value, adding 1 to the average value of the minimum parameter and the maximum parameter is determined as the first count parameter;

generating a third pulse signal based on the first parameter;

acquiring a third count difference of the third pulse signal;

The target parameter is determined based on the third difference count value and the second difference count value.

In some possible implementation manners, the determining the target parameter based on the first count difference value and the second count difference value includes:

In the case where the average value of the first count difference value and the second count difference value is smaller than the preset count difference value, subtract one from the average value of the minimum parameter and the maximum parameter to determine the second count. parameter;

generating a fourth pulse signal based on the second parameter;

obtaining the fourth count difference of the fourth pulse signal;

The target parameter is determined based on the fourth count difference and the first count difference.

In some possible implementation manners, the acquiring the count difference value of the at least one pulse signal includes:

acquiring a plurality of pulse signals respectively generated by the crystal based on the plurality of parameters;

acquiring multiple count differences corresponding to the multiple pulse signals;

Wherein, determining the target parameter based on the count difference of the at least one pulse signal includes:

Using the dichotomy method, obtain the target count difference value that is closest to the preset count difference value among the plurality of count difference values;

A parameter corresponding to the target count difference value is determined as the target parameter.

Obtaining the target count difference by the dichotomy method avoids ergodic comparison of the preset count difference and the count difference of each pulse signal, reduces the calculation amount of the chip, improves the calibration efficiency and reduces the time cost.

In some possible implementations, the method further includes:

The plurality of count differences are sorted in ascending or descending order.

In some possible implementations, the parameter values of the plurality of parameters decrease as the frequency of the pulse signal increases.

By defining the characteristics of the multiple parameters, the acquired difference counts can be automatically sorted in the order from large to small or from small to large, which avoids re-counting the multiple counts after acquiring the multiple count differences. The step of reordering the difference values effectively reduces the time cost of calibrating the pulse signal on the basis of obtaining the target parameter or target count difference value through the dichotomy method.

In some possible implementations, the parameter values of the plurality of parameters are inversely proportional to the frequency of the pulse signal.

In some possible implementation manners, the acquiring the count difference value of the at least one pulse signal includes:

According to the ascending or descending order of parameter values, the count difference value of at least one pulse signal is obtained in sequence.

In some possible implementations, the method further includes:

The calibration signaling sent by the test equipment is received by using the universal serial bus USB to serial port and the universal asynchronous transceiver UART hub HUB, and the calibration signaling is used to trigger the chip to perform crystal calibration.

In some possible implementations, the calibration signaling includes the plurality of parameters.

In some possible implementations, the method further includes:

The plurality of parameters are stored in a register to transmit the plurality of parameters to the crystal by controlling the register.

The crystal is triggered by the register to generate the pulse signal to be calibrated, that is, the register is responsible for and controls the operation of the crystal to generate the signal to be calibrated, which reduces the workload of the chip and effectively improves the work efficiency of the chip for pulse signal calibration.

In some possible implementations, the method further includes:

A calibration result is stored in the register, and the calibration result is used to indicate the target parameter.

In some possible implementations, the method further includes:

The calibration result and/or the count difference of the at least one pulse signal are sent to the test equipment by using the universal serial bus USB to serial port and the universal asynchronous transceiver UART hub HUB, the calibration result is used to indicate the target parameter, so The count difference value of the at least one pulse signal is used for the test device to compare with a preset count difference value on the display interface.

By sending the count difference of the at least one pulse signal to the testing device, the user can observe each count difference and all the count differences of the at least one pulse signal on the display interface of the testing device. The corresponding relationship between the preset count difference values is convenient for the user to manually adjust the target count difference value, so as to realize the calibration mechanism of automatic calibration and manual calibration. Similarly, by sending the calibration results to the test equipment, it is convenient for designers to perform batch calibrations and adjust parameter designs.

In some possible implementation manners, the acquiring the count difference value of the at least one pulse signal includes:

Acquiring multiple count differences of each pulse signal in the at least one pulse signal;

At least one count difference that is later in time among the multiple count differences of each pulse signal in the at least one pulse signal is determined as the count difference of the corresponding pulse signal.

In this way, the count difference value corresponding to each pulse signal can be accurately obtained, and accordingly, the calibration accuracy of the pulse signal can be improved. In other words, by testing each pulse signal in the at least one pulse signal, and then obtaining the count difference value corresponding to each pulse signal, it is possible to avoid the counting of pulse signals measured when the system is unstable or the crystal is unstable. The difference value is inaccurate, which can improve the accuracy of the count difference value and the calibration accuracy of the pulse signal.

In some possible implementations, the method further includes:

The reference pulse signal generated using the calibrated application system is received.

Triggering the calibrated chip by the application system to generate the reference pulse signal can simplify the structure of the chip and reduce the hardware cost on the basis of acquiring the reference pulse signal.

In some possible implementations, the reference pulse signal is a pulse width modulated PWM signal.

In some possible implementation manners, the chip is a Bluetooth low energy BLE chip.

In a second aspect, a chip is provided, and the chip includes:

a crystal for generating at least one pulsed signal based on at least one of the plurality of parameters;

a processing unit connected to the crystal for:

Obtain the count difference value of the at least one pulse signal, and the count difference value of each pulse signal in the at least one pulse signal is the system tick count value based on the corresponding pulse signal obtained by using two external interrupts triggered by the reference pulse signal difference between;

determining a target parameter based on the count difference of the at least one pulse signal;

The pulse signal generated based on the target parameter is determined as the pulse signal after crystal calibration.

In some possible implementations, the processing unit is specifically used for:

The count difference value of the at least one pulse signal is obtained by using a dichotomy method.

In some possible implementations, the processing unit is more specifically used to:

Determine the minimum and maximum parameters among multiple parameters;

generating a first pulse signal and a second pulse signal based on the minimum parameter and the maximum parameter, respectively;

respectively acquiring the first count difference of the first pulse signal and the second count difference of the second pulse signal;

The target parameter is determined based on the first count difference and the second count difference.

In some possible implementations, the processing unit is more specifically used to:

In the case that the average value of the first count difference value and the second count difference value is equal to the preset count difference value, the average value of the minimum parameter and the maximum parameter is determined as the target parameter.

In some possible implementations, the processing unit is more specifically used to:

When the average value of the first count difference value and the second count difference value is greater than the preset count difference value, adding 1 to the average value of the minimum parameter and the maximum parameter is determined as the first count parameter;

generating a third pulse signal based on the first parameter;

acquiring a third count difference of the third pulse signal;

The target parameter is determined based on the third difference count value and the second difference count value.

In some possible implementations, the processing unit is more specifically used to:

In the case where the average value of the first count difference value and the second count difference value is smaller than the preset count difference value, subtract one from the average value of the minimum parameter and the maximum parameter to determine the second count. parameter;

generating a fourth pulse signal based on the second parameter;

obtaining the fourth count difference of the fourth pulse signal;

The target parameter is determined based on the fourth count difference and the first count difference.

In some possible implementations, the processing unit is specifically used for:

acquiring a plurality of pulse signals respectively generated by the crystal based on the plurality of parameters;

acquiring multiple count differences corresponding to the multiple pulse signals;

Using the dichotomy method, obtain the target count difference value that is closest to the preset count difference value among the plurality of count difference values;

A parameter corresponding to the target count difference value is determined as the target parameter.

In some possible implementations, the processing unit is also used for:

The plurality of count differences are sorted in ascending or descending order.

In some possible implementations, the parameter values of the plurality of parameters decrease as the frequency of the pulse signal increases.

In some possible implementations, the parameter values of the plurality of parameters are inversely proportional to the frequency of the pulse signal.

In some possible implementations, the processing unit is specifically used for:

According to the ascending or descending order of parameter values, the count difference value of at least one pulse signal is obtained in sequence.

In some possible implementations, the chip further includes:

Universal serial bus USB-to-serial and universal asynchronous transceiver UART hub HUB, the USB-to-serial is connected to the processing unit through the UART HUB, and the processing unit receives the test through the USB-to-serial and the UARTHUB Calibration signaling sent by the device, where the calibration signaling is used to trigger the chip to perform crystal calibration.

In some possible implementations, the calibration signaling includes the plurality of parameters.

In some possible implementations, the chip further includes:

a register, the processing unit is connected to the crystal through the register, and the processing unit is configured to store the plurality of parameters to the register so as to send the plurality of parameters to the crystal by controlling the register.

In some possible implementations, the processing unit is further configured to store a calibration result in the register, where the calibration result is used to indicate the target parameter.

In some possible implementations, the chip further includes:

Universal serial bus USB to serial port and universal asynchronous transceiver UART hub HUB, the USB to serial port is connected to the processing unit through the UART HUB, and the processing unit passes the USB to serial port and the UARTHUB to test The device sends a calibration result and/or a count difference value of the at least one pulse signal, the calibration result is used to indicate the target parameter, and the count difference value of the at least one pulse signal is used by the test device to communicate with the test device on the display interface. The preset count difference is compared.

In some possible implementations, the processing unit is specifically used for:

Acquiring multiple count differences of each pulse signal in the at least one pulse signal;

At least one count difference that is later in time among the multiple count differences of each pulse signal in the at least one pulse signal is determined as the count difference of the corresponding pulse signal.

In some possible implementations, the processing unit is specifically used for:

The reference pulse signal generated using the calibrated application system is received.

In some possible implementations, the reference pulse signal is a pulse width modulated PWM signal.

In some possible implementation manners, the chip is a Bluetooth low energy BLE chip.

In a third aspect, a Bluetooth headset is provided, including:

The chip described in the second aspect or any possible implementation manner of the second aspect.

Description of drawings

FIG. 1 is a schematic diagram of a system architecture of an embodiment of the present application.

FIG. 2 is a schematic flowchart of a method for crystal calibration according to an embodiment of the present application.

FIG. 3 is another schematic flowchart of a method for crystal calibration according to an embodiment of the present application.

FIG. 4 is a schematic block diagram of a chip according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

The methods involved in the embodiments of the present application can be applied to various crystals (also called resonators), and can also be applied to various chips or electronic devices having crystals. For example, adding an IC to form a crystal element of an oscillator circuit inside the package. The method can also be applied to crystal oscillators (also known as oscillators). The crystal can also be called a passive crystal oscillator, and the crystal oscillator can also be called an active crystal oscillator. For example, a crystal oscillator can be understood as a combination device of the crystal and the capacitor connected to the crystal.

For another example, the chip may be a single-chip (Single-Chip Microcomputer) or an integrated circuit chip. For example, the chip may be a central processing unit (Central Processing Unit, CPU), a random access memory (Random Access Memory, RAM), a read only memory (Read Only Memory, ROM) with data processing capabilities using VLSI technology. , a variety of I/O ports and interrupt systems, integrate timer/counter and other functions (may also include display driver circuit, pulse width modulation circuit, analog multiplexer, A/D converter and other circuits) into a single silicon chip A small but complete microcomputer system composed of

Wherein, the crystal can generate the pulse signal through the cooperation of the capacitor connected with the crystal. In this embodiment, the capacitor connected to the crystal can be integrated into the chip, and the value of the capacitor can be made into a configurable state. For example, the capacitance value is configured as a plurality of parameters for representing the capacitance value, so that the crystal in the chip can respectively generate a plurality of pulse signals based on the plurality of parameters. For example, a crystal in a chip can generate pulse signals of multiple frequencies, respectively, based on multiple parameters configured. At this time, the user can adjust the frequency of the pulse signal by modifying the capacitance value (that is, modifying the configured parameter). Due to the consistency of the components in each circuit, each product needs to be individually set with an optimal capacitance value before it is put into use, so that the frequency of the pulse signal meets the application requirements. The crystal calibration involved in the embodiments of the present application may refer to the process of obtaining the optimum capacitance value (or optimum parameter) before the chip is put into use. Of course, the above-described crystal calibration may include post-repair calibration or testing to determine whether the product performs or functions according to the original product specifications.

FIG. 1 is a schematic block diagram of a system architecture of an embodiment of the present application.

As shown in FIG. 1 , the system architecture 100 may include a test device 110 , an intermediate device or system 120 , and a chip 130 . The testing device 110 can be used to start or trigger the entire calibration process, for example, to deliver the parameters used to generate the pulse signal to the intermediate device or system 120, so that the intermediate device or system can forward it to the The chip 130 is described above. The test equipment 110 may also be used to display calibration results. The intermediate device or system 120 may also be used to generate a reference pulse signal. The chip 130 may compare the reference pulse signal generated by the intermediate device or system 120 with the pulse signal to be calibrated generated by the crystal in the chip 130 to determine the calibration result. The chip 130 can also send the calibration result to the testing device 110 through the intermediate device or system 120, so that the testing device 110 can display the calibration result.

The test equipment 110 may also be referred to as a calibration tool or test bench. For example, the testing device may be a personal computer or a personal computer (Personal Computer, PC). For example, traditional desktop computers, DIY computers, notebook computers, and tablet computers, all-in-one computers, ultrabooks, PDAs, embedded computers, etc. that have become popular in recent years.

In some embodiments of the present application, the testing device 110 may include a Universal Asynchronous Receiver/Transmitter (UART) 111 . The UART 111 converts the information or data to be transmitted between serial communication and parallel communication. For example, the UART 111 can be integrated into the connection of the communication interface of the test equipment 110 for a chip that converts a parallel input signal into a serial output signal. The testing device 110 may send a reference pulse signal trigger command to the intermediate device or system 120 through the UART 111, where the reference pulse signal trigger command is used to trigger the intermediate device or system 120 to generate at least one reference pulse signal. For example, the reference pulse signal trigger command is used to trigger the intermediate device or system 120 to generate a reference pulse signal.

The intermediate device or system 120 may be a physical device independent of the test device 110 and the chip 130 , or may be an apparatus or an application program integrated on the test device 110 or the chip.

In some embodiments of the present application, the intermediate device or system 120 may further include an application system 121 for generating a reference pulse signal. For example, the application system 121 can generate 16 reference pulse signals. For example, the reference pulse signal may be a clock signal (clock signal, CLK), ie CLK . . . CLK16. Optionally, the intermediate device or system 120 may include a universal serial bus (Universal Serial Bus, USB) to serial port 122, which is used to convert the USB interface of the test device 110 into a universal serial port, which is convenient for quickly receiving the test. Information or data sent by device 110 . For example, the USB to serial port 122 can convert one serial port into four serial ports. Optionally, the test equipment may further include a Universal Asynchronous Receiver/TransmitterHub (UARTHUB) 123, and the UARTHUB 123 may be used to divide the received signal into multiple serial ports. For example, the UARTHUB 123 can be used to convert the received 4-channel serial port into 16-channel serial port of the layer. That is, the UARTHUB 123 can be connected to the UART1...UART16 serial ports. For example, the intermediate device or system 120 may broadcast the information to be sent to the chip 130 through the serial ports of UART 1 . . . UART 16 .

A serial port can also be called a serial interface, a serial communication interface or a serial communication interface (such as a COM interface), and is an extended interface using a serial communication method. Serial Interface (Serial Interface) sequentially transmits data bit by bit, its communication line is simple, and can realize two-way communication (the telephone line can be directly used as a transmission line).

The chip 130 may be referred to as a device under test (Device Under Test, DUT), which is also referred to as a device under test (EUT) and a unit under test (UUT). The device under test may be a manufactured product that is tested at the time of first manufacture or later in its life cycle. The above-mentioned chip 130 may be any type of chip including a crystal or a crystal oscillator. For example, the chip 130 may be a Bluetooth Low Energy (Bluetooth Low Energy, BLE) chip, and the BLE chip may also be referred to as a Bluetooth low energy chip.

In some embodiments of the present application, the chip 130 may include a crystal 131 for generating a pulse signal, so that the chip 130 can operate normally. Optionally, the chip 130 may further include a processing unit 132, and the processing unit may be used to perform a crystal calibration process, that is, to determine whether the pulse signal to be calibrated can reach an expected frequency, or to compare the pulse signal to be calibrated with a reference Pulse signal. Optionally, the chip 130 may further include a register 133 for storing parameters for generating the pulse signal. During the calibration process, the processing unit 132 may send the parameters to be calibrated to the crystal by controlling the register 133, so that the crystal generates a corresponding pulse signal.

It should be noted that, in the framework of FIG. 1 , the intermediate device or system 120 can simultaneously generate 16 reference signals (ie CLK1...CLK16), and the intermediate device or system 120 can also generate 16 serial ports (UART 1... UART 16 serial port) to send information or data. In other words, the frame 100 shown in FIG. 1 can be used to calibrate 16 chips simultaneously, wherein the chip 130 can be one of the 16 chips. Of course, in actual operation, one or more chips may be calibrated according to requirements, and reference pulse signals (or UART serial ports) with less than 16 channels or more than 16 channels may also be set, which is not limited in this embodiment of the present application.

FIG. 2 is a schematic flow diagram of a method 200 of crystal calibration according to an embodiment of the present invention. The method 200 is applicable to the crystal 131 or the chip 130 shown in FIG. 1 , and is also applicable to the system frame 100 . For ease of understanding, the method 200 is described below by taking an example where the execution body of the method 200 is a chip. For example, a Bluetooth Low Energy (Bluetooth Low Energy, BLE) chip.

As shown in FIG. 2, the above-described method 200 may include:

S210: Acquire a count difference value of at least one pulse signal, where the at least one pulse signal includes a pulse signal generated by the crystal based on at least one parameter among multiple parameters, and the count difference of each pulse signal in the at least one pulse signal The value is the difference between the system tick count values based on the corresponding pulse signal obtained using two external interrupts triggered by the reference pulse signal.

S220: Determine a target parameter based on the count difference of the at least one pulse signal.

S230: Determine the pulse signal generated based on the target parameter as the pulse signal after crystal calibration.

In short, after the crystal in the chip generates at least one pulse signal based on the acquired at least one parameter, the processing unit of the chip can determine the at least one pulse signal by comparing the at least one pulse signal with the reference pulse signal. The count difference value of the signal (that is, each pulse signal in the at least one pulse signal is a clock signal, the two count values output by the system tick counter are acquired through two external interrupts triggered by the reference pulse signal, and the The difference between the two count values is used as the count difference of the same pulse signal), and then a calibration result (ie, the target parameter) is determined based on the count difference of the at least one pulse signal. Wherein, the frequency of the pulse signal generated by the crystal based on the target parameter best matches the expected frequency. The calibration result may be used to indicate the target parameter or a pulse signal generated based on the target parameter, or the calibration result may also be used to indicate a count difference value corresponding to the target parameter.

Determining the target parameter by the count difference of the at least one pulse signal can not only realize automatic calibration of the pulse signal and reduce labor costs, but also improve the calibration efficiency while reducing the complexity of the calibration mechanism.

The reference pulse signal may be a pulse signal generated by triggering other calibrated chips by the application system 121 as shown in FIG. 1 .

In some embodiments of the present application, the method 200 may further include:

The chip receives the reference pulse signal generated using a calibrated application system.

Of course, the embodiments of the present application are not limited to this. For example, in other alternative embodiments, a high precision can also be provided by a hardware circuit integrated with a Field Programmable Gate Array (FPGA) or a Complex Programmable Logic Device (CPLD). the reference pulse signal.

The reference pulse signal may be any pulse signal whose accuracy is met. For example, the reference pulse signal may be a pulse width modulation (Pulse Width Modulation, PWM) signal. The signal can be modulated by analog control to generate the PWM signal. For example, the required waveform (including shape and amplitude) can be equivalently obtained by modulating the width of the pulse, and then the analog signal level can be digitally encoded to generate information or data that can be used for transmission. For example, changes in signal, energy, etc. can be adjusted by adjusting for changes in duty cycle. The duty cycle may refer to the percentage of the entire signal cycle when the signal is at a high level in one cycle, for example, the duty cycle of a square wave is 50%.

In some embodiments of the present application, the PWM signal may be directly generated by an internal module of the chip. For example, the PWM signal may be generated by the chip 130 or the application system 121 shown in FIG. 1 . For example, the I/O interface of the chip 130 may be provided with an integrated module. In other words, the chip 130 may be provided with function modules with PWM signal output in the program. The I/O interface may be a link between the chip 130 and the controlled object to exchange information. The chip 130 can exchange data with external devices through the I/O interface. The I/O interface can be a programmable interface, that is, the working mode of the I/O interface can be controlled by a program.

The method for obtaining the count difference of at least one pulse signal by the chip in the embodiment of the present application will be described below.

In some embodiments of the present application, the application system 121 may be a system that has been calibrated using a spectrum analyzer before crystal calibration, and the clock frequency accuracy has reached a state that is more accurate than a standard protocol (eg, a BLE standard protocol). In actual operation, the application system 121 can generate a precise PWM signal of a certain frequency (eg, 40 Hz) to the chip 130 . The chip 130 samples the PWM signal generated by the application system 121 through an I/O interface that can be used as an external interrupt input. The calibration process can be performed in the chip 130 and driven by the PWM signal generated by the application system 121 .

Taking the method of traversing to obtain multiple count differences corresponding to the multiple pulse signals as an example, with reference to FIG. 1 , when the test equipment 110 sends a serial port command to start the calibration process, the chip 130 writes a parameter into the register 133 (ie the parameters used to generate the pulse signal). For example, the parameter may be an offset value. For another example, the initial value of the offset value may be 0. Then, the chip 130 can calculate and record the difference of the system tick clock count between two external interrupts (assuming the clock frequency of the system tick clock is set to 64M, if the crystal has been calibrated, the clock frequency of the system tick clock will be Infinitely close to 64M, when the frequency of the system tick clock is 64M, the difference between the two external interrupts triggered by the 40Hz PWM signal should be 1600000, that is, the preset count difference can be 1600000), after the parameter +1 and write to register 133, calculate and record the difference of the system tick clock count between two external interrupts again, after traversing all crystal calibration parameters, find out the difference of the system tick count value that is closest to the parameter corresponding to 1600000, It is the target parameter of crystal calibration (can be used to reflect the calibration result).

It should be noted that the register can trigger the crystal to generate a calibrated pulse signal based on the target parameter. For example, the register can modify (or adjust) the capacitance value of the capacitor connected to the crystal to the target based on the target parameter. The capacitance value corresponding to the parameter to generate the calibrated pulse signal. In other words, the above-mentioned parameters correspond to the configured capacitance values respectively. For example, the plurality of parameters are in one-to-one correspondence with the plurality of capacitance values. The target parameter is selected from the plurality of parameters as the optimal parameter, so that the pulse signal generated based on the capacitance value corresponding to the target parameter is the most expected (ie the most accurate) pulse signal.

In the above process, the traversal method is used to test each possible parameter, and then the optimal parameter is selected as the calibration result. For example, in the present application, the time cost is reduced, and the number of samples of parameters or count difference values can be reduced. The target parameter can be determined only by the count difference value of the at least one pulse signal, which can not only realize the automatic calibration of the pulse signal, but also reduce the labor cost. It is also possible to improve calibration efficiency while reducing the complexity of the calibration mechanism.

In some embodiments of the present application, the S210 may include:

The count difference value of the at least one pulse signal is obtained by using a dichotomy method.

For example, at least one sampling parameter may be obtained from the plurality of parameters by first using a dichotomy method, and then the count difference value of the at least one pulse signal may be obtained based on the at least one pulse signal respectively generated by the at least one sampling parameter.

In other words, the chip can sample multiple parameters based on the dichotomy method, then generate a pulse signal based on the sampled parameters, and then perform crystal calibration based on the count difference of the pulse signal. In other words, the chip may sample the plurality of parameters based on the dichotomy method, and then determine whether to continue sampling based on the count difference of the obtained pulse signal.

In some embodiments of the present application, the chip may first determine the minimum parameter and the maximum parameter among the multiple parameters; then generate the first pulse signal and the second pulse signal respectively based on the minimum parameter and the maximum parameter; and then obtain the first pulse signal respectively The first count difference of the pulse signal and the second count difference of the second pulse signal; at this time, the chip may determine the target parameter based on the first count difference and the second count difference.

For example, the chip may determine the target parameter by comparing a preset count difference value and an average value of the first count difference value and the second count difference value.

The preset count difference value may be a count difference value corresponding to a preset pulse signal, that is, the preset count difference value may be a calibrated-based difference value obtained by using two external interrupts triggered by a reference pulse signal. The difference between the system tick count values of the pulsed signal. The preset count difference value may be a preset count difference value, or a pre-measured count difference value. Of course, it may also be a count difference value measured during the calibration process, which is not the case in this embodiment of the present application. Do limit.

In other words, the chip can first use the maximum parameter and the minimum parameter as sampling parameters among the plurality of parameters, so as to obtain a pulse signal based on the sampling parameters, and then based on the difference between the first count and the second count The average value is used to determine whether it is necessary to continue to acquire sampling parameters from the plurality of parameters.

For example, in the case that the average value of the first count difference value and the second count difference value is equal to a preset count difference value, the average value of the minimum parameter and the maximum parameter may be determined as the target parameter. In other words, the chip does not need to acquire sampling parameters after acquiring the first count difference and the second count difference.

For another example, in the case where the average value of the first count difference value and the second count difference value is greater than the preset count difference value, the average value of the minimum parameter and the maximum parameter may be increased by 1 determine a first parameter; generate a third pulse signal based on the first parameter; obtain a third count difference value of the third pulse signal; determine the third count difference value based on the third count difference value and the second count difference value the target parameters. In other words, after the chip obtains the first count difference value and the second count difference value, the chip also needs to use the dichotomy method to use the first parameter as a sampling parameter to obtain the third pulse signal. Optionally, the plurality of parameters are continuous parameters. Optionally, the plurality of parameters include the first parameter. Optionally, among the plurality of parameters, the parameter values of the plurality of parameters decrease as the count difference of the pulse signal increases; or, the parameter values of the plurality of parameters decrease with the count difference of the pulse signal. increases as the value decreases.

Using the dichotomy method to determine the sampling parameters among the plurality of parameters can reduce the sampling parameters under the condition of ensuring the calibration accuracy, that is, reduce the pulse signal that needs to be generated, and also reduce the count difference value that needs to be measured, which can effectively improve the calibration efficiency and reduce calibration time.

For another example, in the case that the average value of the first count difference value and the second count difference value is smaller than the preset count difference value, the average value of the minimum parameter and the maximum parameter may be reduced by one determine a second parameter; generate a fourth pulse signal based on the second parameter; obtain a fourth count difference of the fourth pulse signal; determine the fourth count difference based on the fourth count difference and the first count difference the target parameters. In other words, after the chip obtains the first count difference value and the second count difference value, the chip also needs to use the dichotomy method to use the second parameter as a sampling parameter to obtain the fourth pulse signal. Optionally, the plurality of parameters are continuous parameters. Optionally, the plurality of parameters include the second parameter. Optionally, among the plurality of parameters, the parameter values of the plurality of parameters decrease as the count difference of the pulse signal increases; or, the parameter values of the plurality of parameters decrease with the count difference of the pulse signal. increases as the value decreases.

Using the dichotomy method to determine the sampling parameters among the plurality of parameters can reduce the sampling parameters under the condition of ensuring the calibration accuracy, that is, reduce the pulse signal that needs to be generated, and also reduce the count difference value that needs to be measured, which can effectively improve the calibration efficiency and reduce calibration time.

In summary, the use of binary differentiation to obtain the count difference of at least one pulse signal avoids obtaining the count difference of all pulse signals, reduces the total amount of count difference that needs to be obtained, and can ensure the calibration accuracy at the same time. , improve calibration efficiency and reduce time cost.

FIG. 3 is a schematic flowchart of a method 300 for crystal calibration according to an embodiment of the present application.

As shown in FIG. 3, the method 300 may include some or all of the following:

S310, the chip obtains the minimum parameter and the maximum parameter.

S320, the chip generates a first pulse signal and a second pulse signal based on the minimum parameter and the maximum parameter, respectively, and determines whether the first pulse signal and the second pulse signal have been triggered externally by a reference pulse signal interrupted?

S330, if the external interrupt of the first pulse signal and the second pulse signal have been triggered respectively by the reference pulse signal, the chip obtains the count difference of the first pulse signal and the count difference of the second pulse signal value. If the external interrupt of the first pulse signal or the second pulse signal is not triggered by the reference pulse signal, return to S320 and execute.

S340. Has the chip obtained the difference between the counts of the first pulse signal and the count of the second pulse signal for five times?

S350, if the chip has obtained the difference between the five counts of the first pulse signal and the five counts of the second pulse signal, the chip calculates the difference between the five counts of the first pulse signal The average value of the last 3 count differences in the first pulse signal is determined as the first count difference corresponding to the first pulse signal; The average value is determined as the second count difference value corresponding to the second pulse signal. If the chip does not acquire the 5 count difference of the first pulse signal or the 5 count difference of the second pulse signal, return to S320 and execute.

S360, is the minimum parameter smaller than the maximum parameter?

S390, if the minimum parameter is equal to the maximum parameter, the chip determines the minimum parameter or the maximum parameter as a target parameter.

S370, if the minimum parameter is smaller than the maximum parameter, determine whether the average value of the first count difference and the second count difference is equal to a preset count difference?

S371 , if the average value of the first count difference value and the second count difference value is equal to a preset count difference value, the chip determines the average value of the minimum parameter and the maximum parameter as a target parameter.

S380, if the average value of the first count difference value and the second count difference value is not equal to the preset count difference value, determine whether the average value of the first count difference value and the second count difference value is greater than The preset count difference?

S381, if the average value of the first count difference value and the second count difference value is greater than the preset count difference value, the chip adds 1 to the average value of the minimum parameter and the maximum parameter to re-determine is the minimum parameter, return to S320 and execute.

S382, if the average value of the first count difference value and the second count difference value is less than the preset count difference value, the chip decrements the average value of the minimum parameter and the maximum parameter by 1 to re-determine For the maximum parameter, return to S320 and execute.

S390, the calibration ends.

In other embodiments of the present application, the S210 may include:

acquiring a plurality of pulse signals respectively generated by the crystal based on the plurality of parameters;

At this time, the chip can first obtain a plurality of count differences corresponding to the plurality of pulse signals; and then obtain the target count difference that is closest to the preset count difference among the plurality of count differences by using the dichotomy method value; finally, the parameter corresponding to the target count difference value is determined as the target parameter.

Obtaining the target count difference by the dichotomy method avoids ergodic comparison of the preset count difference and the count difference of each pulse signal, reduces the calculation amount of the chip, improves the calibration efficiency and reduces the time cost.

In some embodiments of the present application, the method 200 may further include:

The plurality of count differences are sorted in ascending or descending order.

In other words, after acquiring the plurality of count differences, the chip arranges the plurality of count differences in ascending or descending order, and then uses a dichotomy method to find the difference from the preset count based on a set of arranged count differences. The closest target count difference.

For example, the chip may first determine the set composed of the multiple count differences as the first difference set; then, within the first difference set, use the dichotomy method to determine the target count difference. The count differences in the first difference set are sorted in ascending or descending order.

At this time, the chip may first determine the count difference value of the middle position in the first difference value set; in the case that the count difference value of the middle position is equal to the preset count difference value, set the count difference value of the middle position The count difference value of the position is determined as the target count difference value. In the case that the count difference value at the intermediate position is smaller than the preset count difference value, if the first difference value set is sorted in ascending order, the target is determined in the second half of the first difference value set The count difference value, if the first difference value combination is sorted in descending order, the target count difference value is determined in the first half of the first difference value set. In the case where the count difference value at the middle position is greater than the preset count difference value, if the first difference value set is sorted in ascending order, the target count is determined in the first half of the first difference value set The difference value, if the first difference value combination is sorted in descending order, the target count difference value is determined in the second half of the first difference value set.

In some embodiments of the present application, the parameter values of the plurality of parameters decrease as the frequency of the pulse signal increases.

For example, the parameter values of the plurality of parameters are inversely proportional to the frequency of the pulse signal.

In other words, the parameter values of the plurality of parameters decrease as the count difference of the pulse signal increases. For example, the parameter values of the plurality of parameters are inversely proportional to the count difference of the pulse signal.

By defining the characteristics of the multiple parameters, the acquired difference counts can be automatically sorted in the order from large to small or from small to large, which avoids re-counting the multiple counts after acquiring the multiple count differences. The step of reordering the difference values effectively reduces the time cost of calibrating the pulse signal on the basis of obtaining the target parameter or target count difference value through the dichotomy method.

In other words, the parameter values of the plurality of parameters are decreased as the frequency of the pulse signal increases, so that the parameter values of the plurality of parameters decrease as the count difference of the pulse signal increases, or all The parameter values of the plurality of parameters increase as the count difference value of the pulse signal decreases, so that the chip determines the target parameter or the target count difference value by using a dichotomy method.

In some embodiments of the present application, the S210 may include:

According to the ascending or descending order of parameter values, the count difference value of at least one pulse signal is obtained in sequence.

In some embodiments of the present application, the method 200 may further include:

The calibration signaling sent by the test equipment is received by using the USB to serial port and the UART HUB, and the calibration signaling is used to trigger the chip to perform crystal calibration.

In some embodiments of the present application, the calibration signaling includes the plurality of parameters.

In some embodiments of the present application, the method 200 may further include:

The plurality of parameters are stored in a register to transmit the plurality of parameters to the crystal by controlling the register.

The crystal is triggered by the register to generate the pulse signal to be calibrated, that is, the register is responsible for and controls the operation of the crystal to generate the signal to be calibrated, which reduces the workload of the chip and effectively improves the work efficiency of the chip for pulse signal calibration.

In some embodiments of the present application, the method 200 may further include:

A calibration result is stored in the register, and the calibration result is used to indicate the target parameter.

In some embodiments of the present application, the method 200 may further include:

Send the calibration result and/or the count difference value of the at least one pulse signal to the test equipment by using the USB to serial port and the UART HUB, where the calibration result is used to indicate the target parameter, and the count difference value of the at least one pulse signal is used as The test device compares with the preset count difference on the display interface.

By sending the count difference of the at least one pulse signal to the testing device, the user can observe each count difference and all the count differences of the at least one pulse signal on the display interface of the testing device. The corresponding relationship between the preset count difference values is convenient for the user to manually adjust the target count difference value, so as to realize the calibration mechanism of automatic calibration and manual calibration. Similarly, by sending the calibration results to the test equipment, it is convenient for designers to perform batch calibrations and adjust parameter designs.

In some embodiments of the present application, the S210 may include:

Acquiring multiple count differences of each pulse signal in the at least one pulse signal;

At least one count difference that is later in time among the multiple count differences of each pulse signal in the at least one pulse signal is determined as the count difference of the corresponding pulse signal.

In this way, the count difference value corresponding to each pulse signal can be accurately obtained, and accordingly, the calibration accuracy of the pulse signal can be improved. In other words, by testing each pulse signal in the at least one pulse signal, and then obtaining the count difference value corresponding to each pulse signal, it is possible to avoid the counting of pulse signals measured when the system is unstable or the crystal is unstable. The difference value is inaccurate, which can improve the accuracy of the count difference value and the calibration accuracy of the pulse signal.

In addition, the present application also provides a chip that can be used to execute the above method 200 or 300 .

FIG. 4 is a schematic block diagram of a chip 400 according to an embodiment of the present application. The chip 400 may be the chip 130 shown in FIG. 1 .

As shown in FIG. 4 , the chip 400 may include:

a crystal 410 for generating a plurality of pulse signals based on a plurality of parameters;

A processing unit 420, which is connected to the crystal 410, is used to:

acquiring at least one pulse signal generated by the crystal 410 based on at least one parameter among the plurality of parameters;

Obtaining a count difference value of at least one pulse signal, where the count difference value of each pulse signal in the at least one pulse signal is between the system tick count values based on the corresponding pulse signal obtained by using two external interrupts triggered by the reference pulse signal difference;

determining a target parameter based on the count difference of the at least one pulse signal;

The pulse signal generated based on the target parameter is determined as the pulse signal after calibration of the crystal 410 .

In some embodiments of the present application, the processing unit 420 is specifically configured to:

The count difference value of the at least one pulse signal is obtained by using a dichotomy method.

In some embodiments of the present application, the processing unit 420 is more specifically used for:

Determine the minimum and maximum parameters among multiple parameters;

generating a first pulse signal and a second pulse signal based on the minimum parameter and the maximum parameter, respectively;

respectively acquiring the first count difference of the first pulse signal and the second count difference of the second pulse signal;

The target parameter is determined based on the first count difference and the second count difference.

In some embodiments of the present application, the processing unit 420 is more specifically used for:

In the case that the average value of the first count difference value and the second count difference value is equal to the preset count difference value, the average value of the minimum parameter and the maximum parameter is determined as the target parameter.

In some embodiments of the present application, the processing unit 420 is more specifically used for:

When the average value of the first count difference value and the second count difference value is greater than the preset count difference value, adding 1 to the average value of the minimum parameter and the maximum parameter is determined as the first count parameter;

generating a third pulse signal based on the first parameter;

acquiring a third count difference of the third pulse signal;

The target parameter is determined based on the third difference count value and the second difference count value.

In some embodiments of the present application, the processing unit 420 is more specifically used for:

In the case where the average value of the first count difference value and the second count difference value is smaller than the preset count difference value, subtract one from the average value of the minimum parameter and the maximum parameter to determine the second count. parameter;

generating a fourth pulse signal based on the second parameter;

obtaining the fourth count difference of the fourth pulse signal;

The target parameter is determined based on the fourth count difference and the first count difference.

In some embodiments of the present application, the processing unit 420 is specifically configured to:

acquiring a plurality of pulse signals respectively generated by the crystal 410 based on the plurality of parameters;

acquiring multiple count differences corresponding to the multiple pulse signals;

Using the dichotomy method, obtain the target count difference value that is closest to the preset count difference value among the plurality of count difference values;

A parameter corresponding to the target count difference value is determined as the target parameter.

In some embodiments of the present application, the processing unit 420 is further configured to:

The plurality of count differences are sorted in ascending or descending order.

In some embodiments of the present application, the parameter values of the plurality of parameters decrease as the frequency of the pulse signal increases.

In some embodiments of the present application, the parameter values of the plurality of parameters are inversely proportional to the frequency of the pulse signal.

In some embodiments of the present application, the processing unit 420 is specifically configured to:

According to the ascending or descending order of parameter values, the count difference value of at least one pulse signal is obtained in sequence.

In some embodiments of the present application, the chip further includes:

Universal serial bus USB to serial port and universal asynchronous transceiver UART hub HUB, the USB to serial port is connected to the processing unit 420 through the UART HUB, and the processing unit 420 passes the USB to serial port and the UART The HUB receives the calibration signaling sent by the test equipment, and the calibration signaling is used to trigger the chip to perform crystal 410 calibration.

In some embodiments of the present application, the calibration signaling includes the plurality of parameters.

In some embodiments of the present application, the chip further includes:

A register, the processing unit 420 is connected to the crystal 410 through the register, and the processing unit 420 is configured to store the plurality of parameters in the register, so as to send the plurality of parameters to the crystal 410 by controlling the register parameters.

In some embodiments of the present application, the processing unit 420 is further configured to store a calibration result in the register, where the calibration result is used to indicate the target parameter.

In some embodiments of the present application, the chip further includes:

Universal serial bus USB to serial port and universal asynchronous transceiver UART hub HUB, the USB to serial port is connected to the processing unit 420 through the UART HUB, and the processing unit 420 passes the USB to serial port and the UART The HUB sends the calibration result and/or the count difference value of the at least one pulse signal to the test device, the calibration result is used to indicate the target parameter, and the count difference value of the at least one pulse signal is used by the test device in the The display interface compares with the preset count difference.

In some embodiments of the present application, the processing unit 420 is specifically configured to:

Acquiring multiple count differences of each pulse signal in the at least one pulse signal;

At least one count difference that is later in time among the multiple count differences of each pulse signal in the at least one pulse signal is determined as the count difference of the corresponding pulse signal.

In some embodiments of the present application, the processing unit 420 is specifically configured to:

The reference pulse signal generated using the calibrated application system is received.

In some embodiments of the present application, the reference pulse signal is a pulse width modulated PWM signal.

In some embodiments of the present application, the chip is a Bluetooth low energy BLE chip.

In addition, the present application also provides a Bluetooth headset, and the Bluetooth headset may include the above-mentioned chip 400 .

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (41)

1. A method of crystal alignment, adapted for use with a chip having a crystal, the method comprising:

obtaining a count difference of at least one pulse signal, the at least one pulse signal including a pulse signal generated by the crystal based on at least one parameter of a plurality of parameters, the count difference of each pulse signal of the at least one pulse signal being a difference between system tick count values based on the corresponding pulse signal obtained using two external interrupts triggered by a reference pulse signal;

determining a target parameter based on the count difference of the at least one pulse signal;

and determining the pulse signal generated based on the target parameter as the pulse signal after crystal calibration.

2. The method of claim 1, wherein obtaining a count difference for at least one pulse signal comprises:

and acquiring a counting difference value of the at least one pulse signal by utilizing a dichotomy.

3. The method of claim 2, wherein said obtaining a count difference of said at least one pulse signal using bisection comprises:

determining a minimum parameter and a maximum parameter of a plurality of parameters;

generating a first pulse signal and a second pulse signal based on the minimum parameter and the maximum parameter, respectively;

respectively acquiring a first counting difference value of the first pulse signal and a second counting difference value of the second pulse signal;

wherein determining a target parameter based on the count difference of the at least one pulse signal comprises:

determining the target parameter based on the first count difference and the second count difference.

4. The method of claim 3, wherein determining the target parameter based on the first count difference and the second count difference comprises:

determining the average value of the minimum parameter and the maximum parameter as the target parameter when the average value of the first count difference and the second count difference is equal to a preset count difference.

5. The method of claim 3 or 4, wherein said determining the target parameter based on the first count difference and the second count difference comprises:

determining the average value of the minimum parameter and the maximum parameter plus 1 as a first parameter when the average value of the first count difference and the second count difference is greater than the preset count difference;

generating a third pulse signal based on the first parameter;

acquiring a third count difference value of the third pulse signal;

determining the target parameter based on the third count difference and the second count difference.

6. The method of any of claims 3 to 5, wherein said determining the target parameter based on the first count difference and the second count difference comprises:

when the average value of the first counting difference value and the second counting difference value is smaller than the preset counting difference value, subtracting one from the average value of the minimum parameter and the maximum parameter to determine the average value as a second parameter;

generating a fourth pulse signal based on the second parameter;

acquiring a fourth count difference value of the fourth pulse signal;

determining the target parameter based on the fourth count difference and the first count difference.

7. The method of claim 1, wherein obtaining a count difference for at least one pulse signal comprises:

acquiring a plurality of pulse signals respectively generated by the crystal based on the parameters;

acquiring a plurality of counting difference values corresponding to the plurality of pulse signals;

wherein the determining a target parameter based on the count difference of the at least one pulse signal comprises:

obtaining a target counting difference value which is closest to a preset counting difference value in the plurality of counting difference values by utilizing a bisection method;

and determining the parameter corresponding to the target counting difference as the target parameter.

8. The method of claim 7, further comprising:

the plurality of count differences are sorted in ascending or descending order.

9. The method according to any one of claims 1 to 8, wherein the parameter values of the plurality of parameters decrease with increasing frequency of the pulse signal.

10. The method of claim 9, wherein the parameter values of the plurality of parameters are inversely proportional to the frequency of the pulse signal.

11. The method of claim 9, wherein obtaining a count difference for at least one pulse signal comprises:

and sequentially acquiring the counting difference value of at least one pulse signal according to the ascending or descending order of the parameter values.

12. The method according to any one of claims 1 to 11, further comprising:

and receiving a calibration signaling sent by the test equipment by using a Universal Serial Bus (USB) to serial port and a universal asynchronous receiving and transmitting transmitter (UART) HUB, wherein the calibration signaling is used for triggering the chip to carry out crystal calibration.

13. The method of claim 12, wherein the calibration signaling comprises the plurality of parameters.

14. The method according to any one of claims 1 to 13, further comprising:

storing the plurality of parameters to a register to send the plurality of parameters to the crystal by controlling the register.

15. The method of claim 14, further comprising:

storing a calibration result to the register, the calibration result indicating the target parameter.

16. The method according to any one of claims 1 to 15, further comprising:

and sending a calibration result and/or a counting difference value of the at least one pulse signal to the test equipment by utilizing a Universal Serial Bus (USB) to serial port and a universal asynchronous receiver-transmitter (UART) HUB (HUB), wherein the calibration result is used for indicating the target parameter, and the counting difference value of the at least one pulse signal is used for comparing the test equipment with a preset counting difference value on a display interface.

17. The method of any one of claims 1 to 16, wherein said obtaining a count difference of at least one pulse signal comprises:

acquiring a plurality of counting differences of each pulse signal in the at least one pulse signal;

determining at least one count difference value later in time of the plurality of count difference values of each of the at least one pulse signal as the count difference value of the corresponding pulse signal.

18. The method according to any one of claims 1 to 17, further comprising:

receiving the reference pulse signal generated with the calibrated application system.

19. The method according to any one of claims 1 to 18, wherein the reference pulse signal is a pulse width modulated, PWM, signal.

20. The method according to any one of claims 1 to 19, wherein the chip is a Bluetooth Low Energy (BLE) chip.

21. A chip, wherein the chip comprises:

a crystal for generating a plurality of pulse signals based on a plurality of parameters, respectively;

a processing unit coupled to the crystal, the processing unit to:

obtaining a count difference of at least one pulse signal, the at least one pulse signal including a pulse signal generated by the crystal based on at least one parameter of a plurality of parameters, the count difference of each pulse signal of the at least one pulse signal being a difference between system tick count values based on the corresponding pulse signal obtained using two external interrupts triggered by a reference pulse signal;

determining a target parameter based on the count difference of the at least one pulse signal;

and determining the pulse signal generated based on the target parameter as the pulse signal after crystal calibration.

22. The chip according to claim 21, wherein the processing unit is specifically configured to:

and acquiring a counting difference value of the at least one pulse signal by utilizing a dichotomy.

23. The chip according to claim 22, characterized in that said processing unit is more specifically configured to:

determining a minimum parameter and a maximum parameter of a plurality of parameters;

generating a first pulse signal and a second pulse signal based on the minimum parameter and the maximum parameter, respectively;

respectively acquiring a first counting difference value of the first pulse signal and a second counting difference value of the second pulse signal;

determining the target parameter based on the first count difference and the second count difference.

24. The chip according to claim 23, characterized in that said processing unit is more specifically configured to:

determining the average value of the minimum parameter and the maximum parameter as the target parameter when the average value of the first count difference and the second count difference is equal to a preset count difference.

25. The chip according to claim 23 or 24, characterized in that said processing unit is more specifically configured to:

determining the average value of the minimum parameter and the maximum parameter plus 1 as a first parameter when the average value of the first count difference and the second count difference is greater than the preset count difference;

generating a third pulse signal based on the first parameter;

acquiring a third count difference value of the third pulse signal;

determining the target parameter based on the third count difference and the second count difference.

26. The chip according to any of claims 23 to 25, characterized in that the processing unit is more specifically configured to:

when the average value of the first counting difference value and the second counting difference value is smaller than the preset counting difference value, subtracting one from the average value of the minimum parameter and the maximum parameter to determine the average value as a second parameter;

generating a fourth pulse signal based on the second parameter;

acquiring a fourth count difference value of the fourth pulse signal;

determining the target parameter based on the fourth count difference and the first count difference.

27. The chip according to claim 21, wherein the processing unit is specifically configured to:

acquiring a plurality of pulse signals respectively generated by the crystal based on the parameters;

acquiring a plurality of counting difference values corresponding to the plurality of pulse signals;

obtaining a target counting difference value which is closest to a preset counting difference value in the plurality of counting difference values by utilizing a bisection method;

and determining the parameter corresponding to the target counting difference as the target parameter.

28. The chip of claim 27, wherein the processing unit is further configured to:

the plurality of count differences are sorted in ascending or descending order.

29. The chip of any one of claims 21 to 28, wherein the parameter values of the plurality of parameters decrease with increasing frequency of the pulse signal.

30. The chip of claim 29, wherein the parameter values of the plurality of parameters are inversely proportional to the frequency of the pulse signal.

31. The chip of claim 29, wherein the processing unit is specifically configured to:

and sequentially acquiring the counting difference value of at least one pulse signal according to the ascending or descending order of the parameter values.

32. The chip of any one of claims 21 to 31, wherein the chip further comprises:

USB changes serial ports and universal asynchronous receiving and dispatching transmitter UART concentrator HUB, USB changes the serial ports and passes through the UART HUB is connected to processing unit, processing unit passes through USB changes the serial ports with the calibration signaling that test equipment sent is received to the UART HUB, the calibration signaling is used for triggering the chip carries out the crystal calibration.

33. The chip of claim 32, wherein the calibration signaling comprises the plurality of parameters.

34. The chip according to any one of claims 21 to 33, wherein the chip further comprises:

a register through which the processing unit is connected to the crystal, the processing unit to store the plurality of parameters to the register so as to send the plurality of parameters to the crystal by controlling the register.

35. The chip of claim 34, wherein the processing unit is further configured to store a calibration result to the register, the calibration result indicating the target parameter.

36. The chip according to any one of claims 21 to 35, wherein the chip further comprises:

USB changes serial ports and universal asynchronous receiving and dispatching transmitter UART concentrator HUB to universal serial bus USB, USB changes the serial ports to pass through UART HUB is connected to processing unit, processing unit passes through USB changes the serial ports with UART HUB sends calibration result and/or at least one pulse signal's count difference to test equipment, the calibration result is used for instructing target parameter, at least one pulse signal's count difference is used for test equipment is showing interface and is predetermineeing the count difference and compare.

37. The chip according to any one of claims 21 to 36, wherein the processing unit is specifically configured to:

acquiring a plurality of counting differences of each pulse signal in the at least one pulse signal;

determining at least one count difference value later in time of the plurality of count difference values of each of the at least one pulse signal as the count difference value of the corresponding pulse signal.

38. The chip according to any one of claims 21 to 37, wherein the processing unit is specifically configured to:

receiving the reference pulse signal generated with the calibrated application system.

39. The chip of any one of claims 21 to 38, wherein the reference pulse signal is a Pulse Width Modulated (PWM) signal.

40. The chip according to any one of claims 21 to 39, wherein the chip is a Bluetooth Low Energy (BLE) chip.

41. A bluetooth headset, comprising:

the chip of any one of claims 21 to 40.

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