I am trying to use the CAN Peripheral on my STM32F746G-Disco board. I am using a Waveshare SN65HVD230 transceiver from Amazon. I have built a working CAN bus and verified that messages are being sent 1 per second, using a USB Peak Can.
When I try and send a message from the STM32Board it is not being picked up on the Peak can.
The code works fine in LOOPBACK mode but in NORMAL it isnt working.
Here is a scope capture from the Rx pin on the can transceiver.
Main function code
int main(void)
{
/* USER CODE BEGIN 1 */
setvbuf(stdin, NULL, _IONBF,0);
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
//
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_CAN1_Init();
MX_USART1_UART_Init();
CAN_FilterTypeDef canfilter;
canfilter.FilterActivation = CAN_FILTER_ENABLE;
canfilter.FilterBank = 0;
canfilter.FilterFIFOAssignment = CAN_FILTER_FIFO0;
canfilter.FilterIdHigh = 0x0000;
canfilter.FilterIdLow = 0x0000;
canfilter.FilterMaskIdHigh = 0x0000;
canfilter.FilterMaskIdLow = 0x0000;
canfilter.FilterMode = CAN_FILTERMODE_IDMASK;
canfilter.FilterScale = CAN_FILTERSCALE_32BIT;
canfilter.SlaveStartFilterBank = 0; // Only needed for dual CANs
HAL_CAN_ConfigFilter(&hcan1, &canfilter);
if(HAL_CAN_Start(&hcan1) != HAL_OK){
Error_Handler();
}
CAN_TxHeaderTypeDef TxHeader;
CAN_RxHeaderTypeDef RxHeader;
uint8_t TxData[8] = "HELLOCAN";
uint8_t RxData[8];
uint32_t TxMailbox;
TxHeader.DLC = 8; // Data length
TxHeader.IDE = CAN_ID_STD; // Standard ID
TxHeader.RTR = CAN_RTR_DATA; // Data frame
TxHeader.StdId = 0x321; // CAN ID
// Transmit message
if (HAL_CAN_AddTxMessage(&hcan1, &TxHeader, TxData, &TxMailbox) != HAL_OK) {
Error_Handler();
}
// Wait for message to be received (polling version)
while (HAL_CAN_GetRxFifoFillLevel(&hcan1, CAN_RX_FIFO0) == 0);
if (HAL_CAN_GetRxMessage(&hcan1, CAN_RX_FIFO0, &RxHeader, RxData) != HAL_OK) {
Error_Handler();
} else {
HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
}
Here is my ioc config
Any help is greatly apricated! Thank you
