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標題: 關于STM32 CAN通訊接受數(shù)據(jù)問題，內有代碼與說明 [打印本頁]

作者: dumn 時間: 2019-8-6 10:04
標題: 關于STM32 CAN通訊接受數(shù)據(jù)問題，內有代碼與說明
大大們好，最近在擼關于CAN總線那些事，現(xiàn)在對于CAN的接受數(shù)據(jù)有一些不懂，如果我只接收數(shù)據(jù)，例如來自汽車的CAN數(shù)據(jù)，根據(jù)接收的數(shù)據(jù)，來做一些功能的話，那么我的接收函數(shù)應該配置勒，下面是一些自己寫的代碼配置，接收一位數(shù)據(jù)并將其保存在一個緩沖區(qū)，有什么問題，請多多指！

void CAN_RCC_Config(void)
{
            RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

            RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);

            RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

            RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1,ENABLE);
}

void CAN_GPIO_Config(void)
{
            GPIO_InitTypeDef GPIO_InitStructure;

            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
            GPIO_Init(GPIOA, &GPIO_InitStructure);

            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
            GPIO_InitStructure.GPIO_Speed= GPIO_Speed_50MHz;
            GPIO_Init(GPIOA, &GPIO_InitStructure);

            //GPIO_PinRemapConfig(GPIO_Remap1_CAN1,ENABLE);

}

void CAN_NVIC_Config(void)
{
            NVIC_InitTypeDef NVIC_InitStructure;

            NVIC_InitStructure.NVIC_IRQChannel=USB_LP_CAN1_RX0_IRQn;

            NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

            NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

            NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

            NVIC_Init(&NVIC_InitStructure);
}

void CAN_Config(void)
{
            CAN_InitTypeDef       CAN_InitStructure;
            CAN_FilterInitTypeDef  CAN_FilterInitStructure;


            CAN_DeInit(CAN1);
            CAN_StructInit(&CAN_InitStructure);

            CAN_InitStructure.CAN_TTCM = DISABLE;
            CAN_InitStructure.CAN_ABOM = DISABLE;
            CAN_InitStructure.CAN_AWUM = DISABLE;
            CAN_InitStructure.CAN_NART = DISABLE;
            CAN_InitStructure.CAN_RFLM = DISABLE;
            CAN_InitStructure.CAN_TXFP = ENABLE;

CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;

            /* CAN Baudrate */
            CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;

#if 1 // 125K
                     CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
                     CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
                     CAN_InitStructure.CAN_Prescaler = 32;
#endif
#if 0 // 250K
                     CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
                     CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
                     CAN_InitStructure.CAN_Prescaler = 16;
#endif
#if 0 // 500K
                     CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
                     CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
                     CAN_InitStructure.CAN_Prescaler = 8;
#endif
#if 0 // 1MBps
               CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
               CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
               CAN_InitStructure.CAN_Prescaler = 4;
#endif

CAN_Init(CAN1,&CAN_InitStructure);

            CAN_FilterInitStructure.CAN_FilterNumber=1;

CAN_FilterInitStructure.CAN_FilterMode=CAN_FilterMode_IdMask;

CAN_FilterInitStructure.CAN_FilterScale=CAN_FilterScale_32bit;

CAN_FilterInitStructure.CAN_FilterIdHigh=0 ;
CAN_FilterInitStructure.CAN_FilterIdLow=0 ;

CAN_FilterInitStructure.CAN_FilterMaskIdHigh=0 ;
CAN_FilterInitStructure.CAN_FilterMaskIdLow=0 ;

            CAN_FilterInitStructure.CAN_FilterFIFOAssignment= 0 ;

CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;

CAN_FilterInit(&CAN_FilterInitStructure);

/* CAN FIFO0 message pending interrupt enable */
CAN_ITConfig(CAN1,CAN_IT_FMP0, ENABLE);
}

void USB_LP_CAN1_RX0_IRQHandler(void)
{
      CanRxMsg       RxMessage;

      CAN_Receive(CAN1,CAN_FIFO0,&RxMessage);

      RxMessage.StdId = 0 ;                                           //選擇標準ID
      RxMessage.ExtId = 0 ;                                           //選擇擴展ID
      RxMessage.IDE = CAN_ID_STD;                               //選擇接收標準幀
      RxMessage.DLC = 1 ;                                              //將接收數(shù)據(jù)長度
      RxMessage.RTR = CAN_RTR_DATA ;                      //選擇接收數(shù)據(jù)幀

      CAN_Receive(CAN1,CAN_FIFO0, &RxMessage);       //接收FIFO0數(shù)據(jù)

      if(Rx_flag == 0)
      {
            if(RxMessage.DLC == 1)
            {
                              CAN_RX_BUF[0] = RxMessage.Data[0];             //將接收的數(shù)據(jù)保存進緩沖區(qū)
            }
      }
}

u8 CAN_GetMsg(u8 *msg)
{
      if(Rx_flag == 1)
      {
            *msg = CAN_RX_BUF[0] ;

            Rx_flag = 0;
            return 1;
      }
      else
            return 0;
}

void Clear_CanBuffer(void)
{
      Rx_flag = 0;             //清楚接收標志位
      memset(CAN_RX_BUF, 0 ,sizeof(u8)*CAN_RX_LEN);             //清空緩沖區(qū)
}

u8 Check_CanRx(void)
{
      return (Rx_flag == 6);
}

作者: 361259400 時間: 2023-4-24 08:55
啥是沒有看見文件

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