STM32MX 配置CANFD收发通讯

一、环境

MCU：STM32G0B1CEU6
CAN收发器：JIA1042

二、MX配置

配置SYS

配置canfd并开启中断，我开了两个FDCAN，配置是一样的，这里贴一下波特率的计算公式：

也就是：CAN时钟频率/预分频器/（1+TS1+TS2）
按照我这里的时钟就是：
CAN时钟频率为40MHZ，预分频器为1，TS1=5,TS2=4
所以数据段的频率为40/8/（1+5+4）=500MHZ

同时我这里开了个uart用作调试，配置完成后生成

三、滤波器配置

这里设置了ID为0x000，使用CANFD，数据长度64，滤波器在系统初始化完成后就可以进行配置了

void FDCAN1_config(void){FDCAN_FilterTypeDef sFilterConfig;/* Configure Rx filter */sFilterConfig.IdType = FDCAN_STANDARD_ID;sFilterConfig.FilterIndex = 0;sFilterConfig.FilterType = FDCAN_FILTER_MASK;sFilterConfig.FilterConfig = FDCAN_FILTER_TO_RXFIFO0;sFilterConfig.FilterID1 = 0x000;sFilterConfig.FilterID2 = 0x000;if (HAL_FDCAN_ConfigFilter(&hfdcan1, &sFilterConfig) != HAL_OK){Error_Handler();}/* Configure global filter:Filter all remote frames with STD and EXT IDReject non matching frames with STD ID and EXT ID */if (HAL_FDCAN_ConfigGlobalFilter(&hfdcan1, FDCAN_REJECT, FDCAN_REJECT, FDCAN_FILTER_REMOTE, FDCAN_FILTER_REMOTE) != HAL_OK){Error_Handler();}/* Start the FDCAN module */if (HAL_FDCAN_Start(&hfdcan1) != HAL_OK){Error_Handler();}if (HAL_FDCAN_ActivateNotification(&hfdcan1, FDCAN_IT_RX_FIFO0_NEW_MESSAGE, 0) != HAL_OK){Error_Handler();}TxHeader.Identifier = 0x000;                 // CAN IDTxHeader.IdType = FDCAN_STANDARD_ID;        // 标准IDTxHeader.TxFrameType = FDCAN_DATA_FRAME;           TxHeader.DataLength = FDCAN_DLC_BYTES_64;TxHeader.ErrorStateIndicator = FDCAN_ESI_ACTIVE;TxHeader.BitRateSwitch = FDCAN_BRS_ON;TxHeader.FDFormat = FDCAN_FD_CAN;                  // CANFDTxHeader.TxEventFifoControl = FDCAN_NO_TX_EVENTS;TxHeader.MessageMarker = 0;
}
void FDCAN2_config(void){FDCAN_FilterTypeDef sFilterConfig;/* Configure Rx filter */sFilterConfig.IdType = FDCAN_STANDARD_ID;sFilterConfig.FilterIndex = 0;sFilterConfig.FilterType = FDCAN_FILTER_MASK;sFilterConfig.FilterConfig = FDCAN_FILTER_TO_RXFIFO0;sFilterConfig.FilterID1 = 0x000;sFilterConfig.FilterID2 = 0x000;if (HAL_FDCAN_ConfigFilter(&hfdcan2, &sFilterConfig) != HAL_OK){Error_Handler();}/* Configure global filter:Filter all remote frames with STD and EXT IDReject non matching frames with STD ID and EXT ID */if (HAL_FDCAN_ConfigGlobalFilter(&hfdcan2, FDCAN_REJECT, FDCAN_REJECT, FDCAN_FILTER_REMOTE, FDCAN_FILTER_REMOTE) != HAL_OK){Error_Handler();}/* Start the FDCAN module */if (HAL_FDCAN_Start(&hfdcan2) != HAL_OK){Error_Handler();}if (HAL_FDCAN_ActivateNotification(&hfdcan2, FDCAN_IT_RX_FIFO0_NEW_MESSAGE, 0) != HAL_OK){Error_Handler();}TxHeader.Identifier = 0x000;                 // CAN IDTxHeader.IdType = FDCAN_STANDARD_ID;        // 标准IDTxHeader.TxFrameType = FDCAN_DATA_FRAME;           TxHeader.DataLength = FDCAN_DLC_BYTES_64;TxHeader.ErrorStateIndicator = FDCAN_ESI_ACTIVE;TxHeader.BitRateSwitch = FDCAN_BRS_ON;TxHeader.FDFormat = FDCAN_FD_CAN;                  // CANFDTxHeader.TxEventFifoControl = FDCAN_NO_TX_EVENTS;TxHeader.MessageMarker = 0;
}

四、发送和接收函数
这里我的发送是写在while里面的，实现的功能flag标志位1时，是一个canfd1发送数据，canfd2接收后flag值为2；flag为2时，canfd2发送数据，canfd1接收将flag值等于1
HAL库发送函数为：

HAL_FDCAN_AddMessageToTxFifoQ(FDCAN_HandleTypeDef *hfdcan, const FDCAN_TxHeaderTypeDef *pTxHeader,const uint8_t *pTxData)

接收函数为：

HAL_FDCAN_GetRxMessage(FDCAN_HandleTypeDef *hfdcan, uint32_t RxLocation,FDCAN_RxHeaderTypeDef *pRxHeader, uint8_t *pRxData)

下面时我的main（发送）和中断回调函数（接收）函数：

FDCAN_RxHeaderTypeDef RxHeader;
FDCAN_TxHeaderTypeDef TxHeader;
uint8_t TXData[64]={0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x00};
uint8_t RxData[64]={0};
uint8_t flag=1;
int main(void)
{/* USER CODE BEGIN 1 *//* 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();/* USER CODE BEGIN SysInit *//* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();MX_FDCAN1_Init();MX_FDCAN2_Init();MX_USART3_UART_Init();/* USER CODE BEGIN 2 */FDCAN1_config();FDCAN2_config();HAL_Delay(2000);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){if(flag==0x01){if(HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan1, &TxHeader, TXData)!=HAL_OK){Error_Handler();}HAL_Delay(1000);}else{if(HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan2, &TxHeader, TXData)!=HAL_OK){Error_Handler();}HAL_Delay(1000);}HAL_Delay(1000);/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}
void HAL_FDCAN_RxFifo0Callback(FDCAN_HandleTypeDef *hfdcan, uint32_t RxFifo0ITs)
{if((RxFifo0ITs & FDCAN_IT_RX_FIFO0_NEW_MESSAGE) != RESET){if(hfdcan->Instance == FDCAN1){if (HAL_FDCAN_GetRxMessage(hfdcan, FDCAN_RX_FIFO0, &RxHeader, RxData) != HAL_OK){Error_Handler();}flag=0x01;HAL_UART_Transmit(&huart3,&flag,1,1000);}if(hfdcan->Instance == FDCAN2){if (HAL_FDCAN_GetRxMessage(hfdcan, FDCAN_RX_FIFO0, &RxHeader, RxData) != HAL_OK){Error_Handler();}flag=0x02;HAL_UART_Transmit(&huart3,&flag,1,1000);}}
}

五、实际使用

实际使用过程中，需要将两个CANFD建立在一个CAN网络中才能进行通讯

六、源码工程

https://download.csdn.net/download/weixin_46516921/90080900