用libusb写一个读写usb 另一端的fpga fifo代码
时间: 2024-04-08 08:30:09 浏览: 22
以下是使用libusb库编写的读写USB与FPGA通信的示例代码:
```c
#includestdio.h>
#include <stdlib.h>
#include <string>
#include <libusb-.0/libusb.h>
#defineENDOR_ID 0xXXXX // 替换成FPGA的供应商ID
#define PRODUCT_ID 0xXXXX // 替换成FPGA的产品ID
#define ENDPOINT_IN 0x81 // 替换成FPGA的输入端点地址
#define ENDPOINT_OUT 0x01 // 替换成FPGA的输出端点地址
#define BUFFER_SIZE 64
int main()
{
libusb_context *context = NULL;
libusb_device_handle *dev_handle = NULL;
int r = 0;
int transferred;
r = libusb_init(&context);
if (r < 0)
{
printf("Failed to initialize libusb\n");
return r;
}
dev_handle = libusb_open_device_with_vid_pid(context, VENDOR_ID, PRODUCT_ID);
if (dev_handle == NULL)
{
printf("Failed to open device\n");
libusb_exit(context);
return -1;
}
r = libusb_claim_interface(dev_handle, 0);
if (r < 0)
{
printf("Failed to claim interface\n");
libusb_close(dev_handle);
libusb_exit(context);
return r;
}
unsigned char read_buffer[BUFFER_SIZE];
unsigned char write_buffer[BUFFER_SIZE];
memset(read_buffer, 0, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
// 从FIFO读取数据
r = libusb_bulk_transfer(dev_handle, ENDPOINT_IN, read_buffer, BUFFER_SIZE, &transferred, 1000);
if (r < 0)
{
printf("Failed to read from FIFO\n");
}
else
{
printf("Read %d bytes from FIFO: ", transferred);
for (int i = 0; i < transferred; i++)
{
printf("%02x ", read_buffer[i]);
}
printf("\n");
}
// 向FIFO写入数据
write_buffer[0] = 0x01; // 示例:写入一个字节的数据
r = libusb_bulk_transfer(dev_handle, ENDPOINT_OUT, write_buffer, BUFFER_SIZE, &transferred, 1000);
if (r < 0)
{
printf("Failed to write to FIFO\n");
}
else
{
printf("Write %d bytes to FIFO\n", transferred);
}
libusb_release_interface(dev_handle, 0);
libusb_close(dev_handle);
libusb_exit(context);
return 0;
}
```
请注意,代码中的VENDOR_ID和PRODUCT_ID需要替换为您的FPGA设备的实际供应商ID和产品ID,ENDPOINT_IN和ENDPOINT_OUT需要根据FPGA的输入和输出端点地址进行设置。此示例代码使用libusb库中的函数进行USB设备的初始化、打开、读写和关闭操作。在读写FIFO之前,请确保正确设置了读取和写入数据的缓冲区。
这只是一个简单的示例,实际应用中可能需要根据具体情况进行调整和扩展。希望这能帮助到您!