Hi, I am trying to receive CAN message on a F405, but the Rx interrupt doesn't trigger. Sending works fine however.
I am also in doubt about the
CAN1_RX0_IRQHandler
because I can't find any documentation when it is triggered, the HAL manual only refers to
HAL_CAN_RxFifo0MsgPendingCallback
neither of which work.
My init code:
HAL_CAN_ActivateNotification(&hcan1,
CAN_IT_RX_FIFO0_MSG_PENDING || CAN_IT_TX_MAILBOX_EMPTY);
userCANFilterSetup(&hcan1);
HAL_CAN_Start(&hcan1);
//-------------
static void MX_CAN1_Init(void) {
/* USER CODE BEGIN CAN1_Init 0 */
/* USER CODE END CAN1_Init 0 */
/* USER CODE BEGIN CAN1_Init 1 */
/* USER CODE END CAN1_Init 1 */
hcan1.Instance = CAN1;
hcan1.Init.Prescaler = 3;
hcan1.Init.Mode = CAN_MODE_NORMAL;
hcan1.Init.SyncJumpWidth = CAN_SJW_1TQ;
hcan1.Init.TimeSeg1 = CAN_BS1_9TQ;
hcan1.Init.TimeSeg2 = CAN_BS2_4TQ;
hcan1.Init.TimeTriggeredMode = DISABLE;
hcan1.Init.AutoBusOff = ENABLE;
hcan1.Init.AutoWakeUp = ENABLE;
hcan1.Init.AutoRetransmission = DISABLE;
hcan1.Init.ReceiveFifoLocked = DISABLE;
hcan1.Init.TransmitFifoPriority = DISABLE;
if (HAL_CAN_Init(&hcan1) != HAL_OK) {
Error_Handler();
}
/* USER CODE BEGIN CAN1_Init 2 */
HAL_NVIC_SetPriority(CAN1_RX0_IRQn, 0, 0); // todo why, just why?
HAL_NVIC_EnableIRQ(CAN1_RX0_IRQn);
/* USER CODE END CAN1_Init 2 */
}
void userCANFilterSetup(CAN_HandleTypeDef *hcan) {
CAN_FilterTypeDef sFilterConfig;
sFilterConfig.FilterIdHigh = 0x0000; //Filter 1 = 0
sFilterConfig.FilterMaskIdHigh = 0xFFFF; //Mask 1 = accept any MSB
sFilterConfig.FilterIdLow = 0x0200 << 5; //Filter 2 = MsgID 0x200
sFilterConfig.FilterMaskIdLow = 0x0200 << 5; //Mask 2 = MsgID 0x200
sFilterConfig.FilterFIFOAssignment = CAN_RX_FIFO0;
sFilterConfig.FilterBank = 0; //Filter Register 0 / 2
sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK; //Maske per ID
sFilterConfig.FilterScale = CAN_FILTERSCALE_16BIT;//2x 16bit Masken per Filter
sFilterConfig.FilterActivation = ENABLE;
HAL_CAN_ConfigFilter(hcan, &sFilterConfig);
}
Messages with ID 0 or 200 should get through, but I don't know if it's the filter or the interrupt.
I tried not initializing a filter at all as well, but that didn't work either, I suspect that the whitelist just remains empty.
