STM32F105的USB_Host模式下驱动U 盘问题卡在USBH_MSC_GETMaxLUN->USBH...
情况是这样的，用STM32F105作host驱动U盘，用的STM32的MSC库，前面都没有问题 Enumeration completed> USBH_USR_UserInput OK.（我只在原库基础上加了串口中断输出调试）一直卡在USBH_MSC_Handle 里的USBH_MSC_GETMaxLUN 里的USBH_CtlReq等，卡在（case CMD_WAIT）这了，谁知道是什么原因?如何解？
贴码如下：
USBH_Status USBH_CtlReq (USB_OTG_CORE_HANDLE *pdev,
USBH_HOST *phost,
uint8_t *buff,
uint16_t length)
{
USBH_Status status;
status = USBH_BUSY;
switch (phost->RequestState)
{
case CMD_SEND:
/* Start a SETUP transfer */
USBH_SubmitSetupRequest(phost, buff, length);
phost->RequestState = CMD_WAIT;
status = USBH_BUSY;
break;
case CMD_WAIT:
if (phost->Control.state == CTRL_COMPLETE )
{
/* Commands successfully sent and Response Received*/
phost->RequestState = CMD_SEND;
phost->Control.state =CTRL_IDLE;
status = USBH_OK;
}
else if(phost->Control.state == CTRL_ERROR)
{
/* Failure Mode */
phost->RequestState = CMD_SEND;
status = USBH_FAIL;
}
else if(phost->Control.state == CTRL_STALLED )
{
/* Commands successfully sent and Response Received*/
phost->RequestState = CMD_SEND;
status = USBH_NOT_SUPPORTED;
}
break;
default:
break;
}
return status;
}
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