CN116418369A - Two-wire communication method, electronic device and computer readable storage medium - Google Patents

Abstract

This application belongs to the technical field of communication, and provides a two-wire communication method, electronic equipment and a computer-readable storage medium. Take the level on the bus, and send the target data in response to reading the level on the data bus that is consistent with the level corresponding to the self-node identification code. When multiple nodes initiate communication requests at the same time, the bus voltage reflects The identification code of the node with the highest level voltage, therefore, can reliably arbitrate the sending node, so that the sending node can send data to the target node. This communication method is based on two-wire implementation, such as common ground wire and level signal wire , which solves the problem that multi-line communication is not conducive to product miniaturization and communication layout.

Description

Two-wire communication method, electronic device and computer readable storage medium

technical field

The present application belongs to the technical field of communication, and in particular relates to a two-line communication method, electronic equipment and a computer-readable storage medium.

Background technique

Traditional limited communication methods Generally speaking, the higher the voltage difference used by the communication signal, the more stable the communication and the farther the transmission distance can be, but the transmission rate will decrease. At the same time, the more lines used, the more complete the functions, the lower the hardware and software requirements. However, the more lines occupy more space on the board, which is not conducive to the miniaturization of products and communication layout.

Contents of the invention

In order to solve the above technical problems, the embodiment of the present application provides a two-line communication method, electronic equipment and computer-readable storage medium, which can solve the problem that traditional multi-line communication is not conducive to product miniaturization and communication arrangement.

The first aspect of the embodiment of the present application provides a two-wire communication method, which is applied to a first node, and the first node is connected to the same data bus and the same ground wire as other nodes; the two-wire communication method includes:

When the data bus is idle, read the level on the data bus after sending its own node identification code to the data bus in a manner of at most three levels;

When the level read on the data bus is consistent with the level corresponding to the own node identification code, send the target node identification code to the data bus; wherein, the target node is read on the data bus Send a confirmation code to the data bus when the target node identification code;

In response to the confirmation code output by the target node read from the data bus, target data is sent to the data bus.

In some embodiments, after sending the self-node identification code to the data bus in a manner of at most three levels, before reading the level on the data bus, the method further includes:

sending a clock synchronization code to the data bus, so that other nodes connected to the data bus perform clock synchronization according to the clock synchronization code.

In some embodiments, before sending the target data to the data bus, further comprising:

In response to the acknowledgment code read from the data bus, a clock calibration code is sent to the data bus to enable the target node to calibrate a clock according to the clock calibration code.

In some embodiments, after sending the target data to the data bus, further comprising:

If the confirmation code is not received beyond the preset time after the target data is sent, resend the target data to the data bus until the confirmation code is received or the number of times of retransmission reaches the preset number of times;

In the data bus, the maximum number of times of resending is a preset number of times.

In some embodiments, after sending the target data to the data bus, further comprising:

If the confirmation code is received within the preset time length after the target data is sent, and the target data does not include a packet return request, then send the end code or continue to send the next message to the data bus said target data; or

If the confirmation code is received within the preset time period after the target data is sent, and the target data includes the packet return request, continue to monitor the state of the data bus to receive the packet return data , and sending the end code or continuing to send the next target data to the data bus when the return packet data is received;

Wherein, the return request is used to instruct the target node to send the return data in response to the target data; the electrical parameter of the end code is different from the electrical parameter of the confirmation code.

In some embodiments, after sending the target data to the data bus, further comprising:

When receiving the verification error code, resend the target data to the data bus.

In some embodiments, the method also includes:

When the data bus is occupied, confirm the node occupying the data bus;

When the priority of the node occupying the data bus is lower than its own node, sending an interrupt communication signal to the data bus so that other nodes connected to the data bus stop sending data;

After sending the interrupt communication signal, sending the target node identification code to the data bus;

The target data is transmitted in response to an acknowledgment code read from the data bus.

In some embodiments, also include:

in response to reading an interrupt communication signal from the data bus, stop sending the target data to the data bus and save the target data;

The target data is resent in response to receiving the end code.

The second aspect of the embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and operable on the processor, and the computer program is implemented when the processor executes the computer program. Steps of the method as described above.

A third aspect of the embodiments of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described above are implemented.

The two-wire communication method provided by the embodiment of the present application sends its own node identification code to the bus with a maximum of three levels, that is, the ternary system, and then reads the level on the bus, and responds to the level read on the data bus Consistent with the level corresponding to its own node identification code, when sending target data, when multiple nodes initiate communication requests at the same time, the bus voltage reflects the node identification code with the highest level voltage, so the sending node can be reliably arbitrated, so The sending node can send data to the target node. This communication method is based on two-wire implementation, such as common ground wire and level signal wire, which solves the problem that multi-wire communication is not conducive to product miniaturization and communication layout.

Description of drawings

FIG. 1 is an exemplary schematic diagram of an application environment of various embodiments of the present application;

Fig. 2 is a flowchart of a two-line communication method provided for some embodiments of the present application;

3 is a waveform diagram of the data bus voltage in the arbitration pairing stage of the two-wire communication method of each embodiment of the present application;

Fig. 4 is a flowchart of a two-line communication method provided by some embodiments of the present application;

5 is a waveform diagram of the data bus voltage at the initiation stage of the two-wire communication method of each embodiment of the present application;

6 is a waveform diagram of the data bus voltage in the data transmission stage of the two-wire communication method of each embodiment of the present application;

7 is a waveform diagram of the data bus voltage at the end stage of the two-wire communication method of each embodiment of the present application;

Fig. 8 is a flowchart of a two-line communication method provided by some embodiments of the present application;

9 is a waveform diagram of the data bus voltage during the interruption phase of the two-wire communication method of various embodiments of the present application;

FIG. 10 is a flowchart of a two-wire communication method provided by some embodiments of the present application;

FIG. 11 is a schematic structural diagram of a two-wire communication device provided by an embodiment of the present application;

FIG. 12 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means one or more than one, unless otherwise specifically defined.

At present, the energy storage system is generally composed of multiple battery packs, such as a master battery pack and multiple slave battery packs. When the energy storage system is working, it is generally necessary to control multiple battery packs in the energy storage system to start or shut down at the same time. , to prolong the service life of the energy storage system.

In the related technology, the charging and discharging of the energy storage system is controlled by the battery management chip. When the battery management chip needs to control multiple battery packs to start working at the same time, it generally needs to perform multiple samplings, and then realize it through complex circuit design. limit the use of energy storage systems.

Please refer to FIG. 1 , which is an exemplary schematic diagram of an application environment of various embodiments of the present application. As shown in Figure 1, the two-wire communication method provided by the embodiment of the present application can be applied to the first node, and the first node and other nodes (ie, the second node to the nth node) are connected to the same data bus (ie, DATA_VOL) and The same ground (that is, GND), where the ground is used to provide a ground reference for the voltage on the data bus. It can be understood that the two-wire communication method can also be applied to other nodes, and each node can communicate with other nodes based on the two-wire communication method. In addition, each node refers to the electrical equipment that can communicate with each other, which can be energy storage equipment, charging equipment, network equipment, lighting equipment, mobile equipment, charging base stations for mobile equipment, etc. In a system that can communicate with each other, Each node can be the same type of device, or a different type of device, for example, a charging device and multiple energy storage devices can form an energy storage system.

In some embodiments, each node may also refer to different modules in the same device. For example, the power conversion module, power module, display module, etc. in the energy storage device, each module serves as a node, and can communicate with other nodes based on the two-wire communication method.

Exemplarily, the data bus level is 0V in the normal state, and each node can control itself to output a voltage of 0V, 3.3V or 5V at each moment to display the data level. When there are multiple node outputs on the data bus, the 5V The priority order of →3.3V→0V shows the data level. When there is any node outputting 5V, the data bus will show 5V. If there is no node outputting 5V, if there is any node outputting 3.3V, the data bus will show 3.3V. Conversely, if all nodes output 0V, the data bus will be 0V.

The basic stages of communication include initiation, arbitration pairing, data transmission, interruption and termination. Therefore, when transmitting data on the data bus, data can be sent in ternary (0V, 3.3V, 5V respectively represent 0, 1, 2) at most, of course, it can also be sent in binary ( 0V, 3.3V, or 0V, 5V, or 3.3V, 5V, respectively represent 0, 1) to transmit data.

Please refer to FIG. 2 , which is a flowchart of a two-line communication method provided by an embodiment of the present application. The two-line communication method provided by an embodiment of the present application includes steps S110-S130.

Step S110, when the data bus is idle, after sending the self-node identification code to the data bus in a manner of at most three levels, and then reading the levels on the data bus.

Wherein, the step S110 of the arbitration pairing phase is executed based on the fact that the data bus is idle, wherein the idle data bus refers to the fact that the data bus is at 0V level for a preset number of clock cycles, or a certain node sends an end code, at this time Indicates that the data bus is in an idle state. The continuous preset number of clock cycles may be 5, 10 or 15 consecutive clock cycles, which is not limited here.

Wherein, the three levels include a first level, a second level and a third level whose voltages increase sequentially. Exemplarily, taking the two-wire communication method applied to the first node as an example, in the arbitration pairing stage, for example, the self-node identification code of the first node is 012, and the first node outputs 0V to the data bus for three consecutive clock cycles , 3.3V, 5V level to send its own node identification code; for example, if the self-node identification code of the first node is 011, then the first node will output 0V, 3.3V to the data bus respectively in three consecutive clock cycles , 3.3V level to send its own node identification code. The first node reads the level on the data bus after sending its own node identification code, for example, sending through one port and detecting in real time through another port.

Therefore, the own node identification code is transmitted in three levels. Each node has the ability to send its own node identification code through 5V, 3.3V, and 0V representing ternary 2, 1, and 0, respectively, and the actual sent level is one level, two levels or The three levels are determined by its own identification code.

Step S120, when the read level on the data bus is consistent with the level corresponding to the own node identification code, send the target node identification code to the data bus.

It can be understood that when the target node reads the target node identification code on the data bus, it sends a confirmation code to the data bus to notify the first node that the target node identification code it sent has been received and confirmed, and the communication pairing is successful. Please refer to FIG. 2 and FIG. 3. Exemplarily, at the same continuous three clock cycle moments, the first node sends its own node identification code as the first sending node, that is, the ID (Identity document, identification) shown in FIG. 3 No. 120, the second node sends its own node identification code 111 (ID number 111) as the second sending node, and both nodes detect that the voltage of the data bus is 5V in the second clock cycle, and at this moment the second node thinks that it is the same as If the self-node identification code is inconsistent and the arbitration fails, the output of the third identification code 1 will be stopped in the third clock cycle, and the output will be changed to 0, indicating that the arbitration of the second node is unsuccessful, and there is no possibility of transmitting data on the data bus at the next moment. Therefore, the data levels displayed on the data bus in three consecutive clock cycles are 3.3V, 5V, and 0V respectively, which are consistent with the self-identification code 120 of the first node, indicating that the arbitration of the first node is successful. The first node that succeeds in the arbitration has the right to transmit data on the data bus at the next moment. After the arbitration is successful, the first node that succeeds in the arbitration sends the identification code 010 (ID number 010) of the target node to be communicated and waits for the target node to respond and confirm for pairing.

Step S130, sending target data to the data bus in response to the confirmation code output by the target node read from the data bus.

Please refer to Fig. 2 and Fig. 3, exemplary, after the arbitration is successful, the first node sends the target node identification code to be communicated on the data bus, and the target node responds to the own node identification code received, and will Send an acknowledgment code (ACK), such as a 3.3V level signal. When the first node reads the confirmation code from the data bus, it means that the two nodes are paired successfully, so that subsequent data communication can be performed, thereby sending target data. It can be understood that a confirmation code with a 3.3V level is only used as an example, and the level parameter setting of the confirmation code can be set arbitrarily according to requirements, such as two 3.3V levels, which are not limited here.

The above-mentioned two-line communication method has a small number of communication lines, and has the ability to transmit data through the ternary system with good anti-interference performance, which is conducive to communication stability, making the transmission distance longer, and at the same time ensuring an efficient transmission rate. .

Please continue to refer to FIGS. 2 and 3 . In some embodiments, in order to ensure smooth data transmission, the clocks of the two nodes to be transmitted are calibrated or synchronized before the arbitration pairing phase ends and the target data is transmitted. Specifically, before sending the target data to the data bus in step S130, the two-wire communication method further includes: in response to the confirmation code read from the data bus, sending a clock calibration code to the data bus to enabling the target node to calibrate a clock according to the clock calibration code.

Exemplarily, after the first node reads the confirmation code sent by the target node from the data bus, it outputs a clock calibration code on the data bus, such as a 5V level, and the target node reads this on the data bus. After the clock calibration code, the clock will be recalibrated once, so that its own clock is synchronized with the clock of the first node, and enters the data transmission and verification stage. In this way, it is ensured that the data between the two nodes can be transmitted accurately and smoothly, and transmission delay and data loss are not easy to occur. It can be understood that a 5V level clock calibration code is only an example, and the level parameter setting of the clock calibration code can be set arbitrarily according to requirements, such as two 5V levels, which are not limited here.

Please refer to FIG. 4 , which is a flowchart of a two-line communication method provided by an embodiment of the present application. Referring to FIG. 4 and FIG. 5 , in some embodiments, in order to ensure the smooth communication of each node, clock synchronization is performed on each node in the phase of initiating communication. Specifically, before step S110, the two-wire communication method further includes step S105: sending a clock synchronization code to the data bus, so that other nodes connected to the data bus perform clock synchronization according to the clock synchronization code.

Exemplarily, when the data bus is in an idle phase, the node that needs to initiate communication (such as the first node) will actively send a clock synchronization code to the data bus, for example, an alternate level of 5V→3.3V→5V, as shown in Figure 5 As shown, the voltage of the entire data bus is pulled up, and the first 5V rising edge read by all nodes from the data bus is the starting point of the clock synchronization code, and according to these three jump edges, trigger their own clock and initiate The clocks of the communication nodes are synchronized, so as to ensure the smooth data transmission in the subsequent communication process, and the transmission delay and data loss are not easy to occur. Then, enter the arbitration stage. It can be understood that the clock synchronization code can also be regarded as the start code of communication, and the level parameter setting of the clock synchronization code can be set arbitrarily according to requirements, and there is no limitation here.

Please continue to refer to FIG. 6. In some embodiments, when the two-wire communication method enters the data transmission stage, the sending node (such as the first node) to send data uses 0V and 3.3V as 0 and 1 signals on the data bus to perform Binary data transmission, 8 data bytes + check code + request return code are sent each time, where the return request is used to instruct the target node to send return packet data in response to the target data, and the request return code is 1 to represent the target The node returns the packet, that is, the target data includes the packet return request, as shown in Figure 6; 0 means that the target node does not need to return the packet, that is, the target data does not include the packet return request. After sending, the next clock only outputs 0V level, and continues to read (that is, monitor) the level on the data bus for a response; for example, wait for the target node to reply with an acknowledgment code (ACK, such as 3.3V) package data. In other embodiments, the node to send data can use 3.3V and 5V, or 0V and 5V as 0 and 1 signals on the data bus to send binary data; or, it can use 0V, 3.3 V and 5V are used as 0, 1 and 2 signals to send ternary data.

Please refer to FIG. 6 , in some embodiments, after sending the target data to the bus in step S130, it also includes: if the confirmation code is not received after the target data is sent for a preset period of time, sending the data to the bus again The bus sends the target data until the confirmation code is received or the number of times of resending reaches a preset number of times, wherein the maximum number of times of resending is a preset number of times.

Exemplarily, if the target node receives the target data, the target node first outputs a 3.3V level confirmation code to the data bus. In addition, if the request return code contained in the target data is 1, the target node also needs to send return packet data to the data bus, and the sending node (such as the first node) monitors and receives the return packet data; if the request return code contained in the target data If the packet code is 0, the target node only needs to output a 3.3V confirmation code to the data bus.

If the sending node reads the confirmation code sent by the target node from the data bus within the preset time period, it considers that the target data is sent successfully. Otherwise, if the confirmation code is not received beyond the preset time period, that is, the voltage of the data bus exceeds the preset time period If they are all at 0V level, the sending node resends the target data to the data bus until the confirmation code is received. If the confirmation code is not received again after the preset time, it will resend again until the preset number of times is reached, such as 2 or 3 times . It can be understood that, wherein, the maximum number of times of resending can be modified in the corresponding register.

In the above embodiments, after the sending node sends the target data, the target node needs to reply with a confirmation code for confirmation, so that the success of the data transmission can be known; at the same time, a retransmission mechanism is set to improve the success rate of the data transmission.

Please continue to refer to FIG. 6 , in some embodiments, after sending the target data to the bus in step S130, the two-wire communication method further includes: if the confirmation is received within the preset time period after the target data is sent code, and the target data does not include a packet return request, then send an end code or continue to send the next target data to the data bus.

Exemplarily, if the request return packet code contained in the target data sent by the sending node is 0, the target node only needs to output a 3.3V level confirmation code to the data bus. Then, if the sending node receives the acknowledgment code sent by the target node on the data bus within a preset period of time, it is considered that the target data is sent successfully, and the next step is continued. If the data transmission has ended, send the end code and wait for the next data transmission to start. Wherein, referring to FIG. 7, the end code can be, for example, an alternate level of 5V→0V→3.3V→0V. It can be seen that the electrical parameter of the end code is different from that of the confirmation code, so that the node can control each data parameter Differentiate and respond. If the data transmission is not over, the sending node continues to send the next target data to the data bus. Generally, the next target data can be different from the previous target data. It can be a data packet or the target node identification of another target node. code to seek data communication with another target node. If each node reads the receiving code from the data bus, it means that the communication is over, and the data bus is considered to be in an idle state, and all other nodes can re-initiate communication.

Please refer to FIG. 6. In some embodiments, after the two-wire communication method sends the target data to the bus in step S130, if the confirmation code is received within the preset time period after the target data is sent, and the If the target data includes the return packet request, continue to monitor the data bus state to receive the return packet data, and send the end code when receiving the return packet data or continue to send to the data bus Next the target data; wherein, the packet return request is used to instruct the target node to send the packet return data in response to the target data.

Exemplarily, if the request return code contained in the target data sent by the sending node is 1, it is considered that the target data includes a return request, and the target node needs to output a confirmation code of 3.3V level to the data bus within a preset duration, Afterwards, it is necessary to send the return packet data to the data bus, and the sending node continues to monitor and receive the return packet data. After the sending node receives the return packet data from the data bus, if the data transmission has ended, it will send an end code and wait for the next data transmission to start; if the data transmission is not completed, the sending node will continue to send the next target data to the data bus. Generally, the next target data can be different from the previous target data, and it can be a data packet, or a target node identification code of another target node, so as to seek data communication with another target node.

In some embodiments, after sending the target data to the data bus in step S130, the two-wire communication method further includes: re-sending the target data to the data bus when a check error code is received.

Exemplarily, the level parameter of the check error code may be different from the clock synchronization code, confirmation code, end code, etc., for example, one or two 5V levels, so as to facilitate the identification of the sending node. When the sending node receives the check error code, it means that the data transmission is wrong. Therefore, in order to ensure the success of the data transmission, the target data should be sent to the data bus to the target node again, so that the data transmission is successful.

Optionally, when the verification error code is received, the target data is resent to the data bus until the confirmation code is received within a preset time period after the target data is sent or the number of resends reaches a preset number of times. That is, if the confirmation code is not received again beyond the preset time period, it will be resent until the preset number of times is reached, such as 2 or 3 times. It can be understood that, wherein, the maximum number of times of resending can be modified in the corresponding register.

Please refer to FIG. 8 , which is a flowchart of a two-line communication method provided by an embodiment of the present application. Combining Figure 8 and Figure 9, in some cases, it is necessary to implement emergency communication, and the current communication needs to be interrupted to perform emergency communication, so in some embodiments, the two-line communication method also includes:

Step S210, when the data bus is occupied, confirm the node occupying the data bus.

For example, when the first node and the second node are communicating with each other, the nth node detects the level signal of the data bus. At this time, the data bus is not detected to have a data idle state (that is, the data bus is at 0V level for consecutive preset clock cycles. or end code), which means that the data bus is occupied at this time, and the nth node confirms the first node and the second node occupying the data bus according to the detected data.

Step S220, when the priority of the node occupying the data bus is lower than that of its own node, sending an interrupt communication signal to the data bus to stop other nodes connected to the data bus from sending data.

The priority of the nodes is set before step 210 is implemented, for example, it can be set when the entire system capable of communicating with each other is set up. The priority of the nth node will be compared with the node occupying the data bus. If the priority of the nth node is lower than that of the node occupying the data bus, no interrupt communication signal will be sent to the data bus. Otherwise, an interrupt communication signal will be sent to the data bus. At this time, all other nodes connected to the data bus (including nodes occupying the data bus) will receive the interrupt communication signal, and stop sending data according to the interrupt communication signal, so that the bus temporarily enters the data idle state. Among them, the interrupt communication signal can be a 5V level with multiple (for example, 4, 5, 10) clock cycles in a row, to distinguish it from a 3.3V level that represents 1 in a row during binary data transmission, so that all other The node can successfully stop sending data according to the interruption communication signal. It can be understood that the level parameter of the interruption communication signal can be set according to requirements, and is not limited here.

Step S230, after sending the interrupt communication signal, sending the target node identification code to the data bus.

After the nth node sends the interrupt communication signal, it has occupied the authority of the data bus to carry out data transmission. From another perspective, it can also be considered as a successful arbitration, so as to send the target node identification code to the data bus to seek and target node (for example, the mth node in FIG. 9 node) for pairing.

Step S240, sending the target data in response to the confirmation code read from the data bus.

Exemplarily, after the nth node sends the interrupt communication signal, it sends the identification code of the target node to be communicated on the data bus, and the target node (such as the mth node in Figure 9) responds to the received self identification code and sends it on the data bus A confirmation code, the nth node reads the confirmation code from the data bus, which means that the two nodes are paired successfully, so that subsequent data communication can be carried out, so as to send the target data, and send the end code to the data bus after the data communication ends . Understandably so. Step S240 is similar to step S130, and other subsequent steps or detailed steps applicable to step S130 are also applicable to step S240, which will not be repeated here.

Optionally, after a node triggers the interruption of communication, other nodes will no longer be able to trigger the interruption of communication before the current transmission is completed, so as to ensure that the node of this interruption of communication can realize complete data transmission.

In the above embodiment, after the data transmission of the nodes (such as the first node and the second node) occupying the data bus is interrupted, after the data transmission of the node causing the interruption ends, the nodes occupying the data bus can continue the data transmission, thereby Guarantees the integrity of the previous data transfer. Please refer to FIG. 10 , which is a flowchart of a two-line communication method provided by an embodiment of the present application. With reference to Figure 9 and Figure 10, in some embodiments, the two-wire communication method further includes:

Step S310, in response to reading an interrupt communication signal from the data bus, stop sending target data to the data bus and save the target data.

Exemplarily, before the interrupt communication signal is read from the data bus, for example, the first node acts as the sending node and the second node acts as the target node, and the first node stops sending the current target to the data bus when the first node reads the interrupt communication signal from the data bus data, and save the complete current target data.

Step S320, resending the target data in response to the received end code.

After sending the emergency information that interrupts the communication, the first node resends the current target data that was interrupted last time after receiving the receiving code, and the second node monitors the data bus after receiving the receiving code, and waits to receive the last received data Interrupted current target data.

In some embodiments, the two-line communication method also includes a broadcast function. After the sending node succeeds in the arbitration or sends out a communication interruption signal, the sending node identification code is a broadcast code. For example, if the target node identification codes are all 0, then all Nodes send target data and all other nodes will receive target data.

Optionally, the request reply packet code of the broadcast target data can only be 0, and no reply packet is requested, so as to avoid errors in data transmission.

Optionally, similar to one of the foregoing embodiments, when the verification error code is received, the target data is resent to the data bus. Until the confirmation code is received within the preset time period after the target data is sent or the number of times of resending reaches the preset number of times. That is, if the confirmation code is not received again beyond the preset time period, it will be resent until the preset number of times is reached, such as 2 or 3 times. It can be understood that, wherein, the maximum number of times of resending can be modified in the corresponding register.

Corresponding to the two-wire communication method described in the above embodiments, FIG. 11 shows a structural block diagram of the two-wire communication device provided by the embodiment of the present application. For the convenience of description, only the parts related to the embodiment of the present application are shown.

Please refer to Figure 11, the two-wire communication device is applied to the first node, and the first node and other nodes are connected to the same data bus and the same ground wire; the two-wire communication device includes a first transceiver module 801, a second transceiver module 802 and a third transceiver module 803.

The first transceiver module 801, when the data bus is idle, reads the level on the data bus after sending its own node identification code to the data bus in a manner of at most three levels.

The second transceiver module 802 sends the target node identification code when the read level on the data bus is consistent with the level corresponding to the own node identification code.

The third transceiver module 803 sends the target data to the data bus in response to the confirmation code output by the target node read from the data bus.

In a possible implementation manner, the first transceiver module 801 is further configured to send a clock synchronization code to the data bus, so that other nodes connected to the data bus perform clock synchronization according to the clock synchronization code.

In a possible implementation manner, the third transceiver module 803 is further configured to send a clock calibration code to the data bus in response to the confirmation code read from the data bus so that the target node Clock calibration code to calibrate the clock.

In a possible implementation manner, the third transceiver module 803 is further configured to resend the target data to the data bus until the confirmation code is not received within a preset period of time after the target data is sent. The number of times of receiving the confirmation code or resending reaches a preset number of times; wherein, the maximum number of times of resending is a preset number of times.

In a possible implementation, the third transceiver module 803 is further configured to receive the confirmation code within the preset time period after the target data is sent, and the target data does not include the packet return request case, then send the end code or continue to send the next target data to the data bus; or

If the confirmation code is received within the preset time period after the target data is sent, and the target data includes the packet return request, continue to monitor the state of the data bus to receive the packet return data , and sending the end code or continuing to send the next target data to the data bus when the return packet data is received;

Wherein, the return request is used to instruct the target node to send the return data in response to the target data; the electrical parameter of the end code is different from the electrical parameter of the confirmation code.

In a possible implementation manner, the third transceiver module 803 is further configured to resend the target data to the data bus when receiving the verification error code.

In a possible implementation manner, the two-wire communication device further includes a detection module and an interruption module.

A detection module, when the data bus is occupied, confirm the node occupying the data bus;

The interrupt module, when the priority of the node occupying the data bus is lower than its own node, sends an interrupt communication signal to the data bus so that other nodes connected to the data bus stop sending data;

The second transceiver module 802 is further configured to send the target node identification code to the data bus after sending the interrupt communication signal;

The third transceiver module 803 is further configured to send the target data in response to the confirmation code read from the data bus.

In a possible implementation manner, the two-wire communication device further includes a saving module, configured to stop sending target data to the data bus and save the target data in response to reading an interruption signal from the data bus. data;

The third transceiver module 803 is further configured to resend the target data in response to the received end code.

FIG. 12 is a schematic structural diagram of an electronic device 90 provided by an embodiment of the present application. As shown in FIG. 12 , the electronic device 90 of this embodiment includes: at least one processor 901 (only one is shown in FIG. 12 ), a memory 903 and stored in the memory 903 and can be used in the at least one processor 901. A computer program 902 running on the computer, and the processor 901 implements the steps in the above-mentioned embodiments when executing the computer program 902 .

The electronic device 90 may include, but not limited to, a processor 901 and a memory 903 . Those skilled in the art can understand that FIG. 12 is only an example of the electronic device 90, and does not constitute a limitation to the electronic device 90. It may include more or fewer components than shown in the figure, or combine certain components, or different components. , for example, may also include input and output devices, network access devices, and so on.

The so-called processor 901 may be a central processing unit (Central Processing Unit, CPU), and the processor 901 may also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit , ASIC), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

The storage 903 may be an internal storage unit of the electronic device 90 in some embodiments, such as a hard disk or memory of the electronic device 90 . The memory 903 may also be an external storage device of the electronic device 90 in other embodiments, such as a plug-in hard disk equipped on the electronic device 90, a smart memory card (Smart Media Car, SMC), a secure digital Card (Secure Digital, SD), flash memory card (Flash Card), etc. Further, the memory 903 may also include both an internal storage unit of the electronic device 90 and an external storage device. The memory 903 is used to store operating systems, application programs, boot loaders (Boot Loader), data, and other programs, such as program codes of the computer programs. The memory 903 can also be used to temporarily store data that has been output or will be output.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, when the present application implements all or part of the processes in the methods of the above-mentioned embodiments, it can be completed by instructing related hardware through computer programs, and the computer programs can be stored in a computer-readable storage medium. When the program is executed by the processor, the steps in the above-mentioned various method embodiments can be realized. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form. The computer-readable storage medium may at least include: any entity or device capable of carrying computer program codes to the charging device/electronic device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access Memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution media, such as U disk, mobile hard disk, magnetic disk or optical disk, etc. In some jurisdictions, computer readable storage media may not be electrical carrier signals and telecommunication signals based on legislation and patent practice.

The embodiment of the present application also provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the foregoing method embodiments are implemented.

In the above-mentioned embodiments, the descriptions of each embodiment have their own emphases, and for parts that are not detailed or recorded in a certain embodiment, refer to the relevant descriptions of other embodiments.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

In the embodiments provided in this application, it should be understood that the disclosed device/network device and method may be implemented in other ways. The above-described device/network device embodiments are only illustrative, and the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units and components can be combined Or it can be integrated into another system, some features can be ignored and not implemented. In another point, the shown or discussed indirect coupling, direct coupling or communication connection may be through some interface, device or unit indirect coupling, direct coupling or communication connection, and may be in electrical, mechanical or other forms.

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

The above-mentioned embodiments are only used to illustrate the technical solution of the present application, but not to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: they can still modify the technical solutions described in the aforementioned embodiments or equivalently replace some of the technical features, and these modifications Or replacement, which will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims (10)

1. A two-wire communication method, which is characterized by being applied to a first node, wherein the first node and other nodes are connected to the same data bus and the same ground wire; the two-wire communication method comprises the following steps:

When the data bus is idle, the self node identification code is sent to the data bus in a mode of at most three levels, and then the level on the data bus is read;

when the level read out from the data bus is consistent with the level corresponding to the self node identification code, a target node identification code is sent to the data bus; the method comprises the steps that a target node sends an acknowledgement code to a data bus when reading the target node identification code on the data bus;

and transmitting target data to the data bus in response to the acknowledgement code output by the target node read from the data bus.

2. The method of claim 1, further comprising, after said transmitting the own node identification code to the data bus in at most three levels, before reading the level on the data bus:

and sending a clock synchronization code to the data bus so that other nodes connected to the data bus perform clock synchronization according to the clock synchronization code.

3. The method according to claim 1 or 2, further comprising, prior to said sending target data to said data bus:

In response to an acknowledgement code read from the data bus, a clock calibration code is sent to the data bus to cause the target node to calibrate a clock in accordance with the clock calibration code.

4. The method of claim 1, further comprising, after said sending the target data to the data bus:

if the confirmation code is not received after the target data is sent for more than a preset time period, the target data is resent to the data bus until the confirmation code is received or the resending times reach a preset times;

wherein the maximum retransmission times are preset times.

5. The method of claim 1, further comprising, after said sending the target data to the data bus:

if the confirmation code is received within the preset time after the target data is sent and the target data does not comprise a packet returning request, sending an end code or continuing to send the next target data to the data bus; or (b)

If the confirmation code is received within the preset time after the target data is sent and the target data comprises the packet returning request, continuing to monitor the data bus state to receive the packet returning data, and sending the end code or continuing to send the next target data to the data bus when the packet returning data is received;

The packet returning request is used for indicating the target node to respond to the target data and send the packet returning data; the electrical parameter of the end code is different from the electrical parameter of the confirmation code.

6. The method of claim 1, further comprising, after said sending the target data to the data bus:

and when the check error code is received, the target data is sent to the data bus again.

7. The method according to claim 1, wherein the method further comprises:

confirming that a node occupying the data bus is occupied when the data bus is occupied;

when the priority of the node occupying the data bus is lower than that of the node, sending an interrupt communication signal to the data bus so as to stop sending data by other nodes connected to the data bus;

after sending an interrupt communication signal, sending the target node identification code to the data bus;

and transmitting the target data in response to the acknowledgement code read from the data bus.

8. The method of any one of claims 1-6, further comprising:

stopping sending target data to the data bus and storing the target data in response to reading an interrupt communication signal from the data bus;

And retransmitting the target data in response to the received end code.

9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 8 when the computer program is executed.

10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 8.

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