Posted on March 24, 2014 at 19:33I have STM32F429-Disco board and I'm trying to connect two CAN interfaces, which this board has.
My parts of the code are: /* CAN1 init function */
void MX_CAN1_Init(void)
{
hcan1.Instance = CAN1;
hcan1.Init.Prescaler = 8; // Specifies the length of a time quantum.
hcan1.Init.Mode = CAN_MODE_NORMAL; // Specifies the CAN operating mode.
hcan1.Init.SJW = CAN_SJW_1TQ; // Specifies the maximum number of time quanta the CAN hardware is allowed to lengthen or shorten a bit to perform resynchronization.
hcan1.Init.BS1 = CAN_BS1_10TQ; // Specifies the number of time quanta in Bit Segment 1.
hcan1.Init.BS2 = CAN_BS2_7TQ; // Specifies the number of time quanta in Bit Segment 2.
hcan1.Init.TTCM = DISABLE; // Enable or disable the time triggered communication mode.
hcan1.Init.ABOM = DISABLE; // Enable or disable the automatic bus-off management.
hcan1.Init.AWUM = DISABLE; // Enable or disable the automatic wake-up mode.
hcan1.Init.NART = DISABLE; // Enable or disable the non-automatic retransmission mode.
hcan1.Init.RFLM = DISABLE; // Enable or disable the receive FIFO Locked mode.
hcan1.Init.TXFP = DISABLE; // Enable or disable the transmit FIFO priority.
hcan1.pTxMsg = &hcan1Transmit;
hcan1.pRxMsg = &hcan1Receive;
HAL_CAN_Init(&hcan1);
hcan1Filter.FilterNumber = 0; // Specifies the filter which will be initialized
hcan1Filter.FilterMode = CAN_FILTERMODE_IDMASK; // Specifies the filter mode to be initialized.
hcan1Filter.FilterScale = CAN_FILTERSCALE_32BIT; // Specifies the filter scale.
hcan1Filter.FilterIdHigh = 0x00; // Specifies the filter identification number (MSBs for a 32-bit configuration, first one for a 16-bit configuration).
hcan1Filter.FilterIdLow = 0x00; // Specifies the filter identification number (LSBs for a 32-bit configuration, second one for a 16-bit configuration).
hcan1Filter.FilterMaskIdHigh = 0x00; // Specifies the filter mask number or identification number, according to the mode (MSBs for a 32-bit configuration, first one for a 16-bit configuration).
hcan1Filter.FilterMaskIdLow = 0x00; // Specifies the filter mask number or identification number, according to the mode (LSBs for a 32-bit configuration, second one for a 16-bit configuration).
hcan1Filter.FilterFIFOAssignment = 0; // Specifies the FIFO (0 or 1) which will be assigned to the filter.
hcan1Filter.FilterActivation = ENABLE; // Enable or disable the filter.
hcan1Filter.BankNumber = 0; // Select the start slave bank filter
HAL_CAN_ConfigFilter(&hcan1, &hcan1Filter);
}
void MX_CAN2_Init(void)
{
hcan2.Instance = CAN2;
hcan2.Init.Prescaler = 8;
hcan2.Init.Mode = CAN_MODE_NORMAL;
hcan2.Init.SJW = CAN_SJW_1TQ;
hcan2.Init.BS1 = CAN_BS1_10TQ;
hcan2.Init.BS2 = CAN_BS2_7TQ;
hcan2.Init.TTCM = DISABLE;
hcan2.Init.ABOM = DISABLE;
hcan2.Init.AWUM = DISABLE;
hcan2.Init.NART = DISABLE;
hcan2.Init.RFLM = DISABLE;
hcan2.Init.TXFP = DISABLE;
hcan2.pTxMsg = &hcan2Transmit;
hcan2.pRxMsg = &hcan2Receive;
HAL_CAN_Init(&hcan2);
hcan2Filter.FilterNumber = 0; // Specifies the filter which will be initialized
hcan2Filter.FilterMode = CAN_FILTERMODE_IDMASK; // Specifies the filter mode to be initialized.
hcan2Filter.FilterScale = CAN_FILTERSCALE_32BIT; // Specifies the filter scale.
hcan2Filter.FilterIdHigh = 0x00; // Specifies the filter identification number (MSBs for a 32-bit configuration, first one for a 16-bit configuration).
hcan2Filter.FilterIdLow = 0x00; // Specifies the filter identification number (LSBs for a 32-bit configuration, second one for a 16-bit configuration).
hcan2Filter.FilterMaskIdHigh = 0x00; // Specifies the filter mask number or identification number, according to the mode (MSBs for a 32-bit configuration, first one for a 16-bit configuration).
hcan2Filter.FilterMaskIdLow = 0x00; // Specifies the filter mask number or identification number, according to the mode (LSBs for a 32-bit configuration, second one for a 16-bit configuration).
hcan2Filter.FilterFIFOAssignment = 0; // Specifies the FIFO (0 or 1) which will be assigned to the filter.
hcan2Filter.FilterActivation = ENABLE; // Enable or disable the filter.
hcan2Filter.BankNumber = 0; // Select the start slave bank filter
HAL_CAN_ConfigFilter(&hcan2, &hcan2Filter);
}
/* Transmit Structure preparation CAN1 */
hcan1Transmit.StdId = 0x321; // Specifies the standard identifier.
hcan1Transmit.ExtId = 0x02; // Specifies the extended identifier.
hcan1Transmit.RTR = CAN_RTR_DATA; // Specifies the type of frame for the message that will be transmitted. < Data frame */
hcan1Transmit.DLC = 1; // Specifies the length of the frame that will be transmitted.
hcan1Transmit.IDE = CAN_ID_STD; // Specifies the type of identifier for the message that will be transmitted. < Standard Id */
hcan1Transmit.Data[0] = 0;
Init_RxMessage(&hcan1Receive);
/* Enable CAN1 interrupt request */
__HAL_CAN_ENABLE_IT(&hcan1, CAN_IT_FMP0);
/* Transmit Structure preparation CAN2 */
hcan2Transmit.StdId = 0x320; // Specifies the standard identifier.
hcan2Transmit.ExtId = 0x01; // Specifies the extended identifier.
hcan2Transmit.RTR = CAN_RTR_DATA; // Specifies the type of frame for the message that will be transmitted. < Data frame */
hcan2Transmit.DLC = 1; // Specifies the length of the frame that will be transmitted.
hcan2Transmit.IDE = CAN_ID_STD; // Specifies the type of identifier for the message that will be transmitted. < Standard Id */
hcan2Transmit.Data[0] = 0;
Init_RxMessage(&hcan2Receive);
/* Enable CAN2 interrupt request */
__HAL_CAN_ENABLE_IT(&hcan2, CAN_IT_FMP0);
I'm connecting these two CAN interfaces through MCP2551 transceiver.
If I change CAN mode to LOOPBACK and test, everything works ok, but when it is in NORMAL mode, it seems there's a problem. I cannot transmit anything through the bus.
Where am I wrong?
#bxcan #can #can #filter #stm32f2 #metoo #can-bus-normal-mode-problem-init
