STM32和PCA82C251通讯不了，急...

发表于 2012-9-27 15:03

这些天一直在调试CAN，之前开发板上用得是VP230,双CAN可以在正常模式下通讯，我项目要用到PCA82C251（CAN收发器），用PCA82C251把VP230替换掉，就是通讯不了。电路图如下：

发表于 2012-9-27 15:05

程序是：
void CAN_Config(void)
{
  /* CAN register init */
  CAN_DeInit(CAN1);
  CAN_DeInit(CAN2);
  CAN_StructInit(&CAN_InitStructure);

  /* CAN1 cell init */
  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 = DISABLE;
  CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
  CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
  CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
  CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
  CAN_InitStructure.CAN_Prescaler = 4;
  CAN_Init(CAN1, &CAN_InitStructure);
  CAN_Init(CAN2, &CAN_InitStructure);

  /* CAN1 filter init */
  CAN_FilterInitStructure.CAN_FilterNumber = 0;
  CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;
  CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;
  CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0000;
  CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000;
  CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000;
  CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;
  CAN_FilterInitStructure.CAN_FilterFIFOAssignment = 0;
  CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
  CAN_FilterInit(&CAN_FilterInitStructure);

  /* CAN2 filter init */
  CAN_FilterInitStructure.CAN_FilterNumber = 14;
  CAN_FilterInit(&CAN_FilterInitStructure);

  /* Transmit */
  TxMessage.StdId = 0x321;
  TxMessage.ExtId = 0x01;
  TxMessage.RTR = CAN_RTR_DATA;
  TxMessage.IDE = CAN_ID_STD;
  TxMessage.DLC = 1;

}

发表于 2012-9-27 15:06

中断：
void CAN1_RX0_IRQHandler(void)
{
  CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);
  if ((RxMessage.StdId == 0x321)&&(RxMessage.IDE == CAN_ID_STD)&&(RxMessage.DLC == 1)&&(RxMessage.Data[0] == 0xAA))
  {
LED_Display(0x03);
  }
  else
  {
LED_Display(0x05);
  }
}

/**
  * @brief  This function handles CAN2 RX0 Handler.
  * @param  None
  * @retval None
  */

void CAN2_RX0_IRQHandler(void)
{
  CAN_Receive(CAN2, CAN_FIFO0, &RxMessage);
  if ((RxMessage.StdId == 0x321)&&(RxMessage.IDE == CAN_ID_STD)&&(RxMessage.DLC == 1)&&(RxMessage.Data[0] == 0x55))
  {
LED_Display(0x04);
  }
  else
  {
LED_Display(0x05);
  }
}

发表于 2013-5-21 20:59

请问楼主，这个问题解决了吗？我也遇到此类问题了，马上毕设就要答辩了，着急

STM32和PCA82C251通讯不了，急...

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