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 ID
     Reject 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 ID
TxHeader.IdType = FDCAN_STANDARD_ID;        // 标准ID
TxHeader.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;                  // CANFD
TxHeader.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 ID
     Reject 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 ID
TxHeader.IdType = FDCAN_STANDARD_ID;        // 标准ID
TxHeader.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;                  // CANFD
TxHeader.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

原文地址：https://blog.csdn.net/weixin_46516921/article/details/144241465

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