最近在使用CH376，单片机为cortex-m3的arm单片机,想试图读取超出64Bytes的config desc，参考了官方的
SETUP_Transfer函数，但一直是失败的,
麻烦各位dalao能不能看看有什么问题
unsigned short MeUsb::SETUP_Transfer( unsigned char *DataBuf, int *plen)
{
printf("%s:%d\r\n", __func__, __LINE__);
unsigned char l, s;
unsigned short req_len, real_len = 0;
unsigned char *p = DataBuf;
endp7_mode = 0x80; //DATA0发送器
endp6_mode = 0xc0; //DATA1接收器
req_len = (unsigned short int)Request.Req.wLength;
/* SETUP阶段 */
wr_usb_data(8, Request.Req_buf);
toggle_send();
s = issue_token((0 << 4) | DEF_USB_PID_SETUP );
if (s != USB_INT_SUCCESS)
{
return (0);
}
/* DATA阶段 */
if (Request.Req_buf[0] & 0x80) //IN数据
{
printf("%s:%d\r\n", __func__, __LINE__);
while (req_len)
{
printf("%s:%d\r\n", __func__, __LINE__);
toggle_recv();
s = issue_token((0 << 4) | DEF_USB_PID_IN);
if ( s == USB_INT_SUCCESS )
{
printf("%s:%d\r\n", __func__, __LINE__);
l = rd_usb_data( p );
real_len += l;
if ( l < max_package ) //短包
{
break;
}
p += l;
req_len -= l;
}
else return (0);
}
}
else //OUT数据
{
printf("%s:%d\r\n", __func__, __LINE__);
while (req_len)
{
printf("%s:%d\r\n", __func__, __LINE__);
l = (req_len > max_package) ? max_package : req_len;
wr_usb_data(l, p);
toggle_send();
s = issue_token((0 << 4) | DEF_USB_PID_OUT);
if ( s == USB_INT_SUCCESS )
{
real_len += l;
p += l;
req_len -= l;
}
else return (0);
}
}
/* 状态阶段 */
endp7_mode = endp6_mode = 0xc0; //DATA1
if (Request.Req_buf[0] & 0x80)
{
wr_usb_data(0, Request.Req_buf);
toggle_send();
s = issue_token((0 << 4) | DEF_USB_PID_OUT);
}
else
{
toggle_recv();
s = issue_token((0 << 4) | DEF_USB_PID_IN);
}
if (s != USB_INT_SUCCESS)
{
return (0);
}
*plen = real_len;
return (s); //成功
}
串口通讯的数据是这样的，不管是get config 还是get status到后面读取数据都是0.，采用自带的指令可以正常获取到desc，但是最高只能到64bytes，有些鼠标键盘的desc已经超过了64bytes了
>>57,AB
>>45
>>5
>>57,AB
>>22
<<14
>>57,AB
>>13
>>5
>>57,AB
>>22
<<14
usb wr:8
>>57,AB
>>2B
>>8
>>80
>>8
>>0
>>0
>>0
>>0
>>1
>>0
toggle send:80
>>57,AB
>>1D
>>80
>>57,AB
>>4F
>>D
issue token:D
>>57,AB
>>22
<<14
>>57,AB
>>1C
>>C0
toggle recv:C0
>>57,AB
>>4F
>>9
issue token:9
>>57,AB
>>22
<<14
>>57,AB
>>27
<<0
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