libusb in windows

最早接触 libusb 当然是在linux下面。原来玩2440开发板的时候，网上有人写了一个基于libusb的工具，2440工作在device 模式下，我记得命令是usb slave.

然后通过这个工具将电脑上的镜像传到板子上，非常方便。

公司的项目正好有usb boot mode.这对裸机来说非常有帮助。于是把握手机制加入以后，居然能够成功的上传镜像。

后来，我发现libusb有windows的版本，于是就把这个工具稍作修改，并且在vs2010上编译通过，并且也能够工作。

下面是代码：

#include <stdio.h>
#include <string.h>

#include <conio.h>

//#include <usb.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
//#include "dbt.h"

#include "lusb0_usb.h"

#define DEVICE_SECBULK_IDVENDOR 0x3252
#define DEVICE_SECBULK_IDPRODUCT 0x0004

struct usb_device_a6
{
usb_dev_handle *hdev;
struct usb_device *dev;
char *filebuf;
int filelen;
char usb_name[MAX_PATH];

};
struct usb_device_a6 a6_usb;

char buf_pr[512];

int usb_init_search()
{
struct usb_bus *busses, *bus;
struct usb_device *dev;
usb_init();
usb_find_busses();
usb_find_devices();
for (bus = usb_get_busses(); bus; bus = bus->next)
{
   for (dev = bus->devices; dev; dev = dev->next)
   {
    printf("idVendor:0x%x\t,ipProduct:0x%x\n",
      dev->descriptor.idVendor, dev->descriptor.idProduct);

if (
     ((DEVICE_SECBULK_IDVENDOR == dev->descriptor.idVendor
     && DEVICE_SECBULK_IDPRODUCT == dev->descriptor.idProduct) )
    )
    {
     a6_usb.dev = dev;
     printf("Target usb device found!\n");
     return 0;
    }

}
}
printf("Target usb device not found!\n");
return -1;
}

int usb_open_port()
{
a6_usb.hdev = usb_open(a6_usb.dev);
if (!a6_usb.hdev)
{
  return -1;
}
else
{
  if (0 != usb_claim_interface(a6_usb.hdev, 0))
  {
   perror("Cannot claim interface");
   usb_close(a6_usb.hdev);
   a6_usb.hdev = NULL;
   return -1;
  }
}
return 0;
}

char* prepare_write_buf(char *filename, unsigned int *len) {
char *write_buf = NULL;
int ret, ret2=0;
FILE *pfile;
int sz;

pfile=fopen(filename,"rb");
if(!pfile) {
printf("open file err\n");
return NULL;
}
fseek(pfile, 0L, SEEK_END);
sz = ftell(pfile);
fseek(pfile, 0L, SEEK_SET);

write_buf = (char*) malloc(sz);
if (NULL == write_buf) {
perror("malloc failed");
goto error;
}

ret = fread(write_buf, 1, sz, pfile);
printf("---Reading file %d\n", ret);

while(ret > 0) {
  ret2 += ret;
  ret=fread(write_buf+ret2,1, sz, pfile);
  printf("---Reading file %d %d\n", ret,ret2);
}
if (sz != ret2) {
  printf("---Reading file failed %d %d\n", sz, ret2);
  goto error;
}

printf("Filename : %s\n", filename);
printf("Filesize : %d bytes\n", (int)sz);
*len = sz;
return write_buf;

error:
  fclose(pfile);
    if (NULL != write_buf)
     free(write_buf);
    sz = 0;
    return NULL;
}

int usb_read_device(int *len)
{
char readbuf[32];
unsigned int *magic=(unsigned int *)readbuf;
int i;
int wantread;
memset(readbuf, 0 , sizeof(readbuf));
wantread = usb_bulk_read(a6_usb.hdev, 0x82, readbuf, 16, 5000);

for(i=0;i<16;i++)
printf("%02x ", readbuf[i]);
printf("\n0x%04x\n",*magic);

if(*magic == 0x22c3b2a1) {
*len=*(magic+2);
printf("\n0x%04x\n",*(magic+2));

return 0;
}
else
return -1;

}

int usb_write_device(unsigned int writelen, char* buf )
{
unsigned int remain = writelen;
unsigned int towrite;
while (remain)
{
  towrite = remain > 256 ? 256 : remain;
  if (towrite != usb_bulk_write(a6_usb.hdev, 0x2, buf + (writelen - remain),
     towrite, 3000)) {
   perror("usb_bulk_write failed");
   break;
  }
  remain -= towrite;
  printf("\r%d%\t %d bytes     ", (writelen - remain) * 100 / writelen, writelen-remain);
  fflush(stdout);
}

return remain;

}

int loadfile_A6(char *f)
{
unsigned int remain;
unsigned int writed=0;
unsigned int retwrite;
int asklen = 0;
unsigned int len;
char *buf;
//todo: add the logic here for getting file path and name
a6_usb.filebuf = prepare_write_buf(f, &len);
a6_usb.filelen = len;

if(!a6_usb.filebuf)
{
return -1;
}

buf = a6_usb.filebuf;
remain = a6_usb.filelen;

for(;;) {
  Sleep(200);
  if(writed == a6_usb.filelen)
  {
   printf("Done!\n");
   return 0;
  }

if(usb_read_device(&asklen) == 0) {
   if(asklen > 0) {
    retwrite=usb_write_device(asklen, a6_usb.filebuf+writed);
    if(retwrite > 0)
     break;
    writed += asklen;
   }
  }

}
return -1;
}

int scan_enable_a6()
{
if(usb_init_search() < 0)
return -1;
if(usb_open_port() < 0)
return -1;
return 0;
}

int main(int argc, char *argv[])
{
if(scan_enable_a6() == 0)
loadfile_A6(argv[1]);

}

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