CDC host cannot goes into CDC_InterfaceInit

[kqian]

Posted on January 29, 2014 at 20:30

I am writing the cdc host code on the discover board. The program can detect the device is connected but it cannot get the device description and go to the CDC_InterfaceInit function . Any one has the idea what's wrong?

Thanks

[kqian]

Posted on January 30, 2014 at 19:23

I found in the below code, when call

 URB_Status = HCD_GetURB_State(pdev , phost->Control.hc_num_out); 

it always return 0. so the program never goes to ''if(URB_Status == URB_DONE)'' Any one know why? Thanks

''USBH_Status USBH_HandleControl (USB_OTG_CORE_HANDLE *pdev, USBH_HOST *phost)

{   uint8_t direction;    static uint16_t timeout = 0;   USBH_Status status = USBH_OK;   URB_STATE URB_Status = URB_IDLE;     phost->Control.status = CTRL_START;   switch (phost->Control.state)   {   case CTRL_SETUP:     /* send a SETUP packet */     USBH_CtlSendSetup     (pdev,                     phost->Control.setup.d8 ,                     phost->Control.hc_num_out);      phost->Control.state = CTRL_SETUP_WAIT;      break;       case CTRL_SETUP_WAIT:        

URB_Status = HCD_GetURB_State(pdev , phost->Control.hc_num_out);

    /* case SETUP packet sent successfully */     if(URB_Status == URB_DONE)     {       direction = (phost->Control.setup.b.bmRequestType & USB_REQ_DIR_MASK);