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/*
* Copyright 2017 by Lukas Lao Beyer <lukas@electronics.kitchen>
*
* This file is part of libfreesrp.
*
* libfreesrp is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* libfreesrp is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with libfreesrp. If not, see <http://www.gnu.org/licenses/>.
*/
#include <freesrp.hpp>
#include <fstream>
#include <vector>
#include <libusb.h>
#define GET_LSW(v) ((unsigned short)((v) & 0xFFFF))
#define GET_MSW(v) ((unsigned short)((v) >> 16))
#define MAX_WRITE_SIZE (2 * 1024)
using namespace FreeSRP;
void ram_write(libusb_device_handle *fx3_handle, unsigned char *buf, unsigned int ramAddress, int len)
{
int index = 0;
while(len > 0)
{
int size = (len > MAX_WRITE_SIZE) ? MAX_WRITE_SIZE : len;
int r = libusb_control_transfer(fx3_handle, 0x40, 0xA0, GET_LSW(ramAddress), GET_MSW(ramAddress), &buf[index], size, FREESRP_USB_TIMEOUT);
if(r != size)
{
throw ConnectionError("FX3 firmware write via libusb control transfer failed: " + std::to_string(r));
}
ramAddress += size;
index += size;
len -= size;
}
}
bool FreeSRP::Util::find_fx3(bool upload_firmware, std::string filename)
{
// TODO: This is UGLY! Clean up
bool success = false;
// Check for FX3
libusb_context *ctx = nullptr;
libusb_device_handle *fx3_handle = nullptr;
try
{
int ret = libusb_init(&ctx);
if(ret < 0)
{
throw ConnectionError("libusb init error: error " + std::to_string(ret));
}
libusb_device **devs;
int num_devs = (int) libusb_get_device_list(ctx, &devs);
if(num_devs < 0)
{
throw ConnectionError("libusb device list retrieval error");
}
for(int i = 0; i < num_devs; i++)
{
libusb_device_descriptor desc;
int ret = libusb_get_device_descriptor(devs[i], &desc);
if(ret < 0)
{
throw ConnectionError("libusb error getting device descriptor: error " + std::to_string(ret));
}
if(desc.idVendor == FX3_VENDOR_ID && desc.idProduct == FX3_PRODUCT_ID)
{
if(upload_firmware)
{
int ret = libusb_open(devs[i], &fx3_handle);
if(ret != 0)
{
throw ConnectionError("libusb could not open FX3 device: error " + std::to_string(ret));
}
}
else
{
success = true;
}
}
}
if(upload_firmware && fx3_handle == nullptr)
{
throw ConnectionError("No Cypress EZ-USB FX3 in bootloader mode found.");
}
else if(upload_firmware)
{
// Open ifstream for firmware file
std::ifstream stream;
stream.exceptions(std::ios::failbit | std::ios::badbit);
stream.open(filename, std::ios::binary | std::ios::ate);
std::streamsize size = stream.tellg();
stream.seekg(0, std::ios::beg);
// Read firmware into vector
std::vector<char> firmware_buffer((size_t) size);
if(!stream.read(firmware_buffer.data(), size))
{
// Could not load file into buffer
throw std::runtime_error("Could not load FX3 firmware file into buffer!");
}
uint32_t filesize = static_cast<uint32_t>(size);
// Write firmware to RAM
int index = 4;
int checksum = 0;
while(index < filesize)
{
unsigned int *data_p = (unsigned int *)(firmware_buffer.data() + index);
int length = data_p[0];
int address = data_p[1];
if(length != 0)
{
for (int i = 0; i < length; i++)
{
checksum += data_p[2+i];
}
ram_write(fx3_handle, (unsigned char *) firmware_buffer.data() + index + 8, (unsigned int) address, length * 4);
}
else
{
if(checksum != data_p[2])
{
throw std::runtime_error("Checksum error in firmware binary");
}
int r = libusb_control_transfer(fx3_handle, 0x40, 0xA0, GET_LSW(address), GET_MSW(address), 0, 0, FREESRP_USB_TIMEOUT);
if(r != 0 && r != -4)
{
// Ignore this, somehow this error's but still works (??): cerr << "Error in control transfer: " << r << endl;
}
break;
}
index += (8 + length * 4);
}
success = true;
}
}
catch(const std::runtime_error &e)
{
if(fx3_handle != nullptr)
{
libusb_release_interface(fx3_handle, 0);
libusb_close(fx3_handle);
}
if(ctx != nullptr)
{
libusb_exit(ctx);
}
throw e;
}
if(fx3_handle != nullptr)
{
libusb_release_interface(fx3_handle, 0);
libusb_close(fx3_handle);
}
if(ctx != nullptr)
{
libusb_exit(ctx);
}
return success;
}
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