dnw2的使用

最新推荐文章于 2021-04-30 19:22:22 发布

zensenhua

最新推荐文章于 2021-04-30 19:22:22 发布

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分类专栏： linux软件包安装文章标签： linux

本文链接：https://blog.youkuaiyun.com/zengsenhua1013/article/details/49565329

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本文详细介绍了如何使用libusb-dev库和C语言与USB设备进行通信，包括安装依赖、编译代码、打开USB设备、读取文件并进行USB批量写操作。教程还提供了代码示例和关键步骤的说明，帮助开发者实现USB设备的通信功能。

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1.第一步，先安装软件包libusb-dev，在终端输入：sudo apt-get install libusb-dev

2.将代码复制到本地文本，然后编译：gcc dnw2.c -o dnw2 -lusb

#include <stdio.h>
#include <usb.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#define QQ2440_SECBULK_IDVENDOR 0x5345

#define QQ2440_SECBULK_IDPRODUCT 0x1234

struct usb_dev_handle * open_port() {
struct usb_bus *busses, *bus;

usb_init();
usb_find_busses();
usb_find_devices();
busses = usb_get_busses();

for (bus = busses; bus; bus = bus->next) {

struct usb_device *dev;

for (dev = bus->devices; dev; dev = dev->next) {

printf("idVendor:0x%x\t,ipProduct:0x%x\n",

dev->descriptor.idVendor, dev->descriptor.idProduct);

if (QQ2440_SECBULK_IDVENDOR == dev->descriptor.idVendor
&& QQ2440_SECBULK_IDPRODUCT == dev->descriptor.idProduct) {

printf("Target usb device found!\n");

struct usb_dev_handle *hdev = usb_open(dev);

if (!hdev) {

perror("Cannot open device");

} else {

if (0 != usb_claim_interface(hdev, 0)) {

perror("Cannot claim interface");

usb_close(hdev);

hdev = NULL;

}

}

return hdev;

}

}

}

printf("Target usb device not found!\n");

return NULL;
}
void usage() {
printf("Usage: dnw2 <file>\n\n");
}

unsigned char* prepare_write_buf(char *filename, unsigned int *len) {
unsigned char *write_buf = NULL;
struct stat fs;
int fd = open(filename, O_RDONLY);
if (-1 == fd) {
perror("Cannot open file");
return NULL;
}
if (-1 == fstat(fd, &fs)) {
perror("Cannot get file size");
goto error;
}
write_buf = (unsigned char*) malloc(fs.st_size + 10);
if (NULL == write_buf) {
perror("malloc failed");
goto error;
}

if (fs.st_size != read(fd, write_buf + 8, fs.st_size)) {
perror("Reading file failed");
goto error;
}
printf("Filename : %s\n", filename);
printf("Filesize : %d bytes\n", fs.st_size);
*((u_int32_t*) write_buf) = 0x30000000; //download address
*((u_int32_t*) write_buf + 1) = fs.st_size + 10; //download size;
*len = fs.st_size + 10;
return write_buf;

error: if (fd != -1)
close(fd);
if (NULL != write_buf)
free(write_buf);
fs.st_size = 0;
return NULL;
}

int main(int argc, char *argv[]) {
if (2 != argc) {
usage();
return 1;
}
struct usb_dev_handle *hdev = open_port();
if (!hdev) {
return 1;
}
unsigned int len = 0;
unsigned char* write_buf = prepare_write_buf(argv[1], &len);
if (NULL == write_buf)
return 1;
unsigned int remain = len;
unsigned int towrite;
printf("Writing data ...\n");
while (remain) {
towrite = remain > 512 ? 512 : remain;
if (towrite != usb_bulk_write(hdev, 0x03, write_buf + (len - remain),
towrite, 3000)) {
perror("usb_bulk_write failed");
break;
}
remain -= towrite;
printf("\r%d%\t %d bytes ", (len - remain) * 100 / len, len
- remain);
fflush(stdout);
}
if (0 == remain)
printf("Done!\n");
return 0;
}