Since updating to CubeMX 5.6.1, my software won't start when there's a USB memory drive plugged into my system. It gets stuck , which is resolved by removing the USB device and plugging it back in.
I'm using STM32F756BGTx with FreeRTOS.
I think i pinpointed the problem.
Sincde CubeMX 5.6.1 the function USBH_CtlReq() contains a seccond occurence of a call to (void)osMessagePut(). I commented it out in the code fragment below.
I noticed the message sent there, results in call to USBH_CtlReq(), which results in sending the same message again, creating an endless loop.
Commenting out the second occurence off (void)osMessagePut() got my system working again.
USBH_StatusTypeDef USBH_CtlReq(USBH_HandleTypeDef *phost, uint8_t *buff,
uint16_t length)
{
USBH_StatusTypeDef status;
status = USBH_BUSY;
switch (phost->RequestState)
{
case CMD_SEND:
/* Start a SETUP transfer */
phost->Control.buff = buff;
phost->Control.length = length;
phost->Control.state = CTRL_SETUP;
phost->RequestState = CMD_WAIT;
status = USBH_BUSY;
#if (USBH_USE_OS == 1U)
phost->os_msg = (uint32_t)USBH_CONTROL_EVENT;
#if (osCMSIS < 0x20000U)
(void)osMessagePut(phost->os_event, phost->os_msg, 0U);
#else
(void)osMessageQueuePut(phost->os_event, &phost->os_msg, 0U, NULL);
#endif
#endif
break;
case CMD_WAIT:
status = USBH_HandleControl(phost);
if ((status == USBH_OK) || (status == USBH_NOT_SUPPORTED))
{
/* Transaction completed, move control state to idle */
phost->RequestState = CMD_SEND;
phost->Control.state = CTRL_IDLE;
}
else if (status == USBH_FAIL)
{
/* Failure Mode */
phost->RequestState = CMD_SEND;
}
else
{
asm("nop");
/* .. */
}
#if (USBH_USE_OS == 1U)
//phost->os_msg = (uint32_t)USBH_CONTROL_EVENT;
#if (osCMSIS < 0x20000U)
//(void)osMessagePut(phost->os_event, phost->os_msg, 0U);
#else
(void)osMessageQueuePut(phost->os_event, &phost->os_msg, 0U, NULL);
#endif
#endif
break;
default:
break;
}
return status;
}
