bxCAN : non bloking read

Hello,

I try to use the bxCAN module on STM32F407. I have a board sending CAN messages and a board receiving CAN messages.
All is working fine in bloking mode with call to HAL_CAN_Receive function.

But I have troubles using non bloking mode with HAL_CAN_Receive_IT function.

Here is my main loop:

for (;;)
        {
            halRes = HAL_CAN_Receive_IT(&s_hPxbCan, 0);
            if(HAL_OK == halRes)
            {
                halRes = HAL_OK;
            }
            else
            {
                halRes = HAL_OK;
            }

            while(0 == fifo_0);
            fifo_0= 0;
            halRes = HAL_OK;

        }

Here is my callback:

void HAL_CAN_RxCpltCallback(CAN_HandleTypeDef* hcan)
{
    HAL_StatusTypeDef halRes;
    static uint8_t nbRxCplt = 0;

    nbRxCplt++;

    if (CAN1->RF0R & CAN_RF0R_FMP0)
    {
        fifo_0++;
    }
    if (CAN1->RF1R & CAN_RF1R_FMP1)
    {
        fifo_1++;
    }
}

My problem is that when the board 1 send a CAN message, the callback HAL_CAN_RxCpltCallback is called in loop instead of only once !

Maybe an interrupt flag is still active?
I was expected that the HAL_CAN library was handeling this automatically.

Thank you
BR
Pierre