CAN接收中断问题

1万 · 2017-9-27 23:43

用以STM32F103ZET6 为MCU的一块板子调试CAN的收发，外围器件是SN65HVD230D（VP230），用的一款USB-CAN的Adapter连接的电脑，通过PC端配套的Cantools 来进行收发。现在的问题是板子可以发数据到电脑上，也就是发送好用，但是接收数据的时候，只有PC上发送AB AA AA AA AA AA AA AA 的时候能进中断

1万 · 2017-9-27 23:45

AB 后面AA的个数任意?

1万 · 2017-9-27 23:47

嗯，发送其它数据，例如11 22 33 44 55 66 77 88 就进不来中断。

1万 · 2017-9-27 23:48

楼主程序可以公开吗？贴程序看下吧，这么说看不出什么原因

1万 · 2017-9-27 23:49

void CAN_GPIO_Config(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);

   /* Configure CAN pin: RX */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

   /* Configure CAN pin: TX */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void RCC_Configuration(void)
{
  ErrorStatus HSEStartUpStatus;                         //定义外部高速晶体启动状态枚举变量
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)
  {
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);

/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);

/* ADCCLK = PCLK2/4=18MHZ */
RCC_ADCCLKConfig(RCC_PCLK2_Div4);

/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1 , RCC_PLLMul_9);

/* Enable PLL */
RCC_PLLCmd(ENABLE);

/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}

/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
  }
}

void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  /* Configure the NVIC Preemption Priority Bits */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

  #ifdef VECT_TAB_RAM
            NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
  #else
            NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
  #endif
/* Enable the USART2 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  /* Enable the CAN Interrupt */
  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_Configuration(void)
{
      CAN_InitTypeDef       CAN_InitStructure;
      CAN_FilterInitTypeDef  CAN_FilterInitStructure;

/* CAN Periph clock enable */
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);

      CAN_DeInit(CAN1);
      CAN_StructInit(&CAN_InitStructure);

      CAN_InitStructure.CAN_TTCM = DISABLE;                                     //失能时间触发通信模式
      CAN_InitStructure.CAN_ABOM = DISABLE;                                     //失能自动离线管理
      CAN_InitStructure.CAN_AWUM = DISABLE;                                     //失能自动唤醒模式
      CAN_InitStructure.CAN_NART = DISABLE;                                     //失能非自动重传输模式
      CAN_InitStructure.CAN_RFLM = DISABLE;                                     //失能接收FIFO锁定模式
      CAN_InitStructure.CAN_TXFP = DISABLE;                                     //失能发送FIFO优先级
      CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;                      //CAN硬件工作在普通模式
      /* 200K的波特率 */
      CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;                                     //重新同步跳跃宽度1个时间单位
      CAN_InitStructure.CAN_BS1 = CAN_BS1_9tq;                                              //时间段1为9个时间单位
      CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq;                                              //时间段2为8个时间单位
      CAN_InitStructure.CAN_Prescaler = 10;                                                       //时间单位的长度
      CAN_Init(CAN1, &CAN_InitStructure);                                                       //200K=36M/(1+9+8)*10

      CAN_FilterInitStructure.CAN_FilterNumber = 0;                                              //待初始化的过滤器0
      CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;             //标识符屏蔽位模式
      CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;             //1个32位过滤器
      CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0000;                                     //用来设定过滤器标识符高段位
      CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000;                                     //用来设定过滤器标识符低段位
      CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000;                               //设定过滤器屏蔽标识符高段位
      CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;                               //设定过滤器屏蔽标识符低段位
      CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_FIFO0;
      CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;                               //使能过滤器
      CAN_FilterInit(&CAN_FilterInitStructure);
}

下面是中断服务函数
void USB_LP_CAN1_RX0_IRQHandler(void)
{
      u8 i ;
      CanRxMsg RxMessage;
      RxMessage.StdId=0x00;
      RxMessage.ExtId=0x00;
      RxMessage.IDE=0;
      RxMessage.DLC=0;
      RxMessage.FMI=0;
      RxMessage.Data[0]=0x00;
      RxMessage.Data[1]=0x00;
      RxMessage.Data[2]=0x00;
      RxMessage.Data[3]=0x00;
      RxMessage.Data[4]=0x00;
      RxMessage.Data[5]=0x00;
      RxMessage.Data[6]=0x00;
      RxMessage.Data[7]=0x00;
      CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);

      for(i=0; i<8; i++)                                                    //通过串口将CAN收到的数据发出来到串口助手上
{
            USART_ClearFlag(USART2, USART_FLAG_TC);
            USART_SendData(USART2,RxMessage.Data);
            while(USART_GetFlagStatus(USART2, USART_FLAG_TC)==RESET);
}

      CAN_FIFORelease(CAN1,CAN_FIFO0);//释放邮箱
}

最后是主函数
int main(void)
{
      RCC_Configuration();
      RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM1 , ENABLE);
      NVIC_Configuration();
      TIM_Configuration();
            CAN_GPIO_Config();
      CAN_Configuration();
      CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);  //CAN中断

      USART_GPIO_Config();
      USART2_Config();
   while(1)                {
      }
}