Posted on May 08, 2017 at 12:40Hi
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;
