Posted on April 20, 2016 at 00:03hcan is locked permanently in HAL_CAN_Transmit_IT when all transmit boxes are full.
Bellow is compressed HAL_CAN_Transmit_IT function:
HAL_StatusTypeDef HAL_CAN_Transmit_IT(CAN_HandleTypeDef* hcan)
{
uint32_t transmitmailbox = CAN_TXSTATUS_NOMAILBOX;
/* Check the parameters */
assert_param(IS_CAN_IDTYPE(hcan->pTxMsg->IDE));
assert_param(IS_CAN_RTR(hcan->pTxMsg->RTR));
assert_param(IS_CAN_DLC(hcan->pTxMsg->DLC));
if((hcan->State == HAL_CAN_STATE_READY) || (hcan->State == HAL_CAN_STATE_BUSY_RX))
{
/* Process Locked */
__HAL_LOCK(hcan); //Here process is locked
/* Select one empty transmit mailbox */
if(HAL_IS_BIT_SET(hcan->Instance->TSR, CAN_TSR_TME0))
{
.....
}
else
{
transmitmailbox = CAN_TXSTATUS_NOMAILBOX;
}
if(transmitmailbox != CAN_TXSTATUS_NOMAILBOX)
{
...........
/* Process Unlocked */
__HAL_UNLOCK(hcan);
...........
}
//!!!!!!!!!!! when all mailboxes are full program goes here and exits with hcan no unlocked
}
else
{
return HAL_BUSY;
}
return HAL_OK;
}
