Posted on January 26, 2018 at 15:55Hi Clive,
thanks for the quick response. I think that is not the issue as I have the transmitter unit in debug mode with a breakpoint at:
/* Request transmission */
SET_BIT(hcan->Instance->sTxMailBox[transmitmailbox].TIR, CAN_TI0R_TXRQ);
and in the receiver unit (also in debug) I get 4 or 5 interrupts.
I've looking at stm32f4xx_hal_can.c and realized that in HAL_CAN_IRQHandler the management for every interrupt related to CAN includes a __HAL_CAN_CLEAR_FLAG macro, except:
/* Receive FIFO 0 message pending interrupt management *********************/
if ((interrupts & CAN_IT_RX_FIFO0_MSG_PENDING) != RESET)
{
/* Check if message is still pending */
if ((hcan->Instance->RF0R & CAN_RF0R_FMP0) != RESET)
{
/* Receive FIFO 0 mesage pending Callback */
/* Call weak (surcharged) callback */
HAL_CAN_RxFifo0MsgPendingCallback(hcan);
}
}
and
/* Receive FIFO 1 message pending interrupt management *********************/
if ((interrupts & CAN_IT_RX_FIFO1_MSG_PENDING) != RESET)
{
/* Check if message is still pending */
if ((hcan->Instance->RF1R & CAN_RF1R_FMP1) != RESET)
{
/* Receive FIFO 1 mesage pending Callback */
/* Call weak (surcharged) callback */
HAL_CAN_RxFifo1MsgPendingCallback(hcan);
}
}
Also, if I add:
__HAL_CAN_DISABLE_IT(hcan,CAN_IT_RX_FIFO1_MSG_PENDING);
inside the above 'if' and re-enable the IT on RX Callback things seem to work.
I'm relatively new to STM32 and maybe I'm using this peripheral the wrong way
Thanks again
