Posted on August 14, 2013 at 17:47Hello,
I'm using the STM USB library version V2.1.0 with an host profile and I found a problem working with some usb keys: the library was going up to enumeration but after if was hanging. Debugging the problem I finally got that the problem was in usbh_core.c in function USBH_HandleControl at case CTRL_DATA_IN_WAIT.
If after sending a request in the previous case, CTRL_DATA_IN, I got a Stall irq in HCINT the library was hanging without trying again with another request.
I solved the problem adding a ''phost->Control.state = CTRL_STALLED;'' in the
if (URB_Status == URB_STALL)
case CTRL_DATA_IN_WAIT:
URB_Status = HCD_GetURB_State(pdev , phost->Control.hc_num_in);
/* check is DATA packet transfered successfully */
if (URB_Status == URB_DONE)
{
phost->Control.state = CTRL_STATUS_OUT;
}
/* manage error cases*/
if (URB_Status == URB_STALL)
{
/* In stall case, return to previous machine state*/
phost->gState = phost->gStateBkp;
phost->Control.state = CTRL_STALLED; ///<<<<< MY MODIFICATION
}
else if (URB_Status == URB_ERROR)
{
/* Device error */
phost->Control.state = CTRL_ERROR;
}
else if ((HCD_GetCurrentFrame(pdev)- phost->Control.timer) > timeout)
{
/* timeout for IN transfer */
phost->Control.state = CTRL_ERROR;
}
break;
Debugging the code I noticed in fact that it was going back to the previous state machine but not starting form its initial case but going directly in a case in the middle of the state machine.
I would like to have your feedback if my modification has any sense for you and if yes I would suggest to add it in the next release of the library.
With this modification now it works with all the usb key I found around in my collegues desks (10 different types).
thanks
michele
#usb-msc-stm32-hang
