Bug in USB Host Library? Isochronous data receive

Posted on May 08, 2017 at 12:40

Hi

I think it is a bug...

Problem:

Isochronous data Receive from  USB Device with ST USB Host library.

- > no example or projects in internet

So i tried to get data from USB Webcam.

But i  didn't get an USBH_URB_DONE event or other flag

i added following lines in function:

static void HCD_HC_IN_IRQHandler   (HCD_HandleTypeDef *hhcd, uint8_t chnum)

    

    if ((hhcd->hc[chnum].ep_type == EP_TYPE_CTRL)||

        (hhcd->hc[chnum].ep_type == EP_TYPE_BULK))

    {

      __HAL_HCD_UNMASK_HALT_HC_INT(chnum);

      USB_HC_Halt(hhcd->Instance, chnum);

      __HAL_HCD_CLEAR_HC_INT(chnum, USB_OTG_HCINT_NAK);    

    }

    else if((hhcd->hc[chnum].ep_type == EP_TYPE_INTR)||

            (hhcd->hc[chnum].ep_type == EP_TYPE_ISOC ))

    {

      USBx_HC(chnum)->HCCHAR |= USB_OTG_HCCHAR_ODDFRM;

      hhcd->hc[chnum].urb_state = URB_DONE;

      HAL_HCD_HC_NotifyURBChange_Callback(hhcd, chnum, hhcd->hc[chnum].urb_state);

    }

    hhcd->hc[chnum].toggle_in ^= 1;   

  }

line   (hhcd->hc[chnum].ep_type == EP_TYPE_ISOC )) added to catch URB EVENT

example for receive isochronous  data :

    case VIDEO_STREAM_START:

            USBH_IsocReceiveData( phost ,

                framebuffer ,

                pVideo->EpVideoStream.wMaxPacketSize,

                pVideo->EpVideoStream.bPipe );

            pVideo->StreamState = VIDEO_STREAM_PLAY;

            osMessagePut ( phost->os_event, USBH_URB_EVENT , 0);

            break;

        case VIDEO_STREAM_PLAY:

            if((USBH_LL_GetURBState(phost , pVideo->EpVideoStream.bPipe) == USBH_URB_DONE)&&

                ((phost->Timer-pVideo->EpVideoStream.wTimer) >= pVideo->EpVideoStream.bInterval)){

                pVideo->EpVideoStream.wTimer = phost->Timer;

                uint32_t  rxlen = USBH_LL_GetLastXferSize  (phost,   pVideo->EpVideoStream.bPipe ) ;

                if( rxlen ){            

             

                }

                USBH_IsocReceiveData( phost ,

                      framebuffer ,

                      pVideo->EpVideoStream.wMaxPacketSize,

                      pVideo->EpVideoStream.bPipe );

            }

            osMessagePut ( phost->os_event, USBH_URB_EVENT , 0);

            break;