Question
CAN Communication: Messages Not Received w/ No Filter
Hello,
I am attempting to communicate between my STM32H7B3I-EVAL and a Vector CANalyzer (VN1630A).
I previously reached out to figure out why my CAN messages from the CANalyzer are not being received by the STM32 MCU. There was a belief that it was the filters causing the issue, so I did not initialize the filters and tried to see if any message was being received. There are still no messages being received, but I can send them from the STM32 to the CANalyzer without issue.
I would like to find out why my code is not working, but I have some specific questions to try and assist my thought process:
- If the FDCAN_FilterTypeDef is a defined variable but not initialized, it will not filter, correct?
- Is the function correct for receiving data from the RXBUFFER?
if(HAL_FDCAN_GetRxMessage(&hfdcan1, FDCAN_RX_BUFFER0, &RxHeader, RxData) != HAL_OK){
Error_Handler();
}
Setup Picture:
#include "main.h"
/** @addtogroup STM32H7xx_HAL_Examples
* @{
*/
/** @addtogroup Templates
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
FDCAN_HandleTypeDef hfdcan1;
FDCAN_FilterTypeDef sFilterConfig;
FDCAN_TxHeaderTypeDef TxHeader;
FDCAN_RxHeaderTypeDef RxHeader;
uint8_t TxData0[] = {0x10, 0x32, 0x54, 0x76, 0x98, 0x00, 0x11, 0x22};
uint8_t TxData1[] = {0x00, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55};
uint8_t TxData2[] = {0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00};
uint8_t TxData3[] = {0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, 0x89};
uint8_t RxData[8];
__IO uint8_t UserButtonClickEvent = RESET;
/* Private function prototypes -----------------------------------------------*/
static void MPU_Config(void);
static void SystemClock_Config(void);
static void Error_Handler(void);
static void CPU_CACHE_Enable(void);
static void CAN_Init(void);
static void CAN_RxStdFilter_Init(void);
static void CAN_RxExtFilter_Init(void);
static void CAN_TxFilter_Init(void);
static uint32_t BufferCmp8b(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);
/*
static DTS_HandleTypeDef DtsHandle;
static int32_t Temperature;
*/
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the MPU attributes */
MPU_Config();
/* Enable the CPU Cache */
CPU_CACHE_Enable();
/* STM32H7xx HAL library initialization:
- Configure the Systick to generate an interrupt each 1 msec
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 280 MHz */
SystemClock_Config();
/* Configure LED1 and LED2 */
BSP_LED_Init(LED1);
BSP_LED_Init(LED2);
BSP_LED_Init(LED3);
/* Configure Tamper push-button in interrupt mode */
BSP_PB_Init(BUTTON_TAMPER, BUTTON_MODE_EXTI);
// CAN Initialization & Configuration
CAN_Init();
//CAN_RxStdFilter_Init();
//CAN_RxExtFilter_Init();
//CAN_TxFilter_Init();
if (HAL_FDCAN_ConfigFilter(&hfdcan1, &sFilterConfig) != HAL_OK)
{
/* Filter configuration Error */
Error_Handler();
}
/* Start the FDCAN module */
HAL_FDCAN_Start(&hfdcan1);
if (HAL_FDCAN_ActivateNotification(&hfdcan1, FDCAN_IT_RX_FIFO0_NEW_MESSAGE, 0) != HAL_OK)
{
/* Notification Error */
Error_Handler();
}
/* Send Tx buffer message */
HAL_FDCAN_EnableTxBufferRequest(&hfdcan1, FDCAN_TX_BUFFER0);
while(1)
{
for (uint16_t i = 0; i < 0xFFFF; i++)
{
uint16_t TxData1[] = {i, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55};
//Add message to Tx FIFO
TxHeader.Identifier = 0x111;
TxHeader.IdType = FDCAN_STANDARD_ID;
TxHeader.TxFrameType = FDCAN_DATA_FRAME;
TxHeader.DataLength = FDCAN_DLC_BYTES_8;
TxHeader.ErrorStateIndicator = FDCAN_ESI_ACTIVE;
TxHeader.BitRateSwitch = FDCAN_BRS_ON;
TxHeader.FDFormat = FDCAN_FD_CAN;
TxHeader.TxEventFifoControl = FDCAN_STORE_TX_EVENTS;
TxHeader.MessageMarker = 0x52;
HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan1, &TxHeader, TxData1);
//HAL_Delay(100);
uint16_t TxData2[] = {i, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55};
TxHeader.Identifier = 0x135;
TxHeader.IdType = FDCAN_STANDARD_ID;
TxHeader.TxFrameType = FDCAN_DATA_FRAME;
TxHeader.DataLength = FDCAN_DLC_BYTES_8;
TxHeader.ErrorStateIndicator = FDCAN_ESI_ACTIVE;
TxHeader.BitRateSwitch = FDCAN_BRS_ON;
TxHeader.FDFormat = FDCAN_FD_CAN;
TxHeader.TxEventFifoControl = FDCAN_STORE_TX_EVENTS;
TxHeader.MessageMarker = 0x52;
HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan1, &TxHeader, TxData2);
//HAL_Delay(100);
if(HAL_FDCAN_GetRxMessage(&hfdcan1, FDCAN_RX_BUFFER0, &RxHeader, RxData) != HAL_OK){
Error_Handler();
}
if(RxHeader.Identifier == 0x123)
BSP_LED_Toggle(LED3);
}
}static void CAN_Init(){
/* Initializes the FDCAN peripheral in loopback mode */
hfdcan1.Instance = FDCAN1;
hfdcan1.Init.FrameFormat = FDCAN_FRAME_CLASSIC;
hfdcan1.Init.Mode = FDCAN_MODE_NORMAL;
hfdcan1.Init.AutoRetransmission = ENABLE;
hfdcan1.Init.TransmitPause = DISABLE;
hfdcan1.Init.ProtocolException = DISABLE;
/* Bit time configuration:
************************
Bit time parameter | Nominal | Data
---------------------------|--------------|----------------
fdcan_ker_ck | 20 MHz | 20 MHz
Time_quantum (tq) | 50 ns | 50 ns
Synchronization_segment | 1 tq | 1 tq
Propagation_segment | 23 tq | 23 tq
Phase_segment_1 | 8 tq | 8 tq
Phase_segment_2 | 8 tq | 8 tq
Synchronization_Jump_width | 8 tq | 8 tq
Bit_length | 40 tq = 2 �s | 40 tq = 2 �s
Bit_rate | 0.5 MBit/s | 0.5 MBit/s
*/
hfdcan1.Init.NominalPrescaler = 0x1; /* tq = NominalPrescaler x (1/fdcan_ker_ck) */
hfdcan1.Init.NominalSyncJumpWidth = 0x8;
hfdcan1.Init.NominalTimeSeg1 = 0x1F; /* NominalTimeSeg1 = Propagation_segment + Phase_segment_1 */
hfdcan1.Init.NominalTimeSeg2 = 0x8;
hfdcan1.Init.DataPrescaler = 0x1;
hfdcan1.Init.DataSyncJumpWidth = 0x8;
hfdcan1.Init.DataTimeSeg1 = 0x1F; /* DataTimeSeg1 = Propagation_segment + Phase_segment_1 */
hfdcan1.Init.DataTimeSeg2 = 0x8;
hfdcan1.Init.MessageRAMOffset = 0;
hfdcan1.Init.StdFiltersNbr = 1;
hfdcan1.Init.ExtFiltersNbr = 1;
hfdcan1.Init.RxFifo0ElmtsNbr = 1;
hfdcan1.Init.RxFifo0ElmtSize = FDCAN_DATA_BYTES_8;
hfdcan1.Init.RxFifo1ElmtsNbr = 2;
hfdcan1.Init.RxFifo1ElmtSize = FDCAN_DATA_BYTES_8;
hfdcan1.Init.RxBuffersNbr = 1;
hfdcan1.Init.RxBufferSize = FDCAN_DATA_BYTES_8;
hfdcan1.Init.TxEventsNbr = 2;
hfdcan1.Init.TxBuffersNbr = 1;
hfdcan1.Init.TxFifoQueueElmtsNbr = 2;
hfdcan1.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
hfdcan1.Init.TxElmtSize = FDCAN_DATA_BYTES_8;
HAL_FDCAN_Init(&hfdcan1);
}