帮忙看看问题在哪？

1万 · 2021-2-7 21:52

stm32l432kc+sn65hvd230,接收不到东西

1万 · 2021-2-7 21:54

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 · 2021-2-7 21:57

230的rs端接100k电阻到地

发送端：
/* CAN1 init function */
static void MX_CAN1_Init(void)
{
      CAN_FilterConfTypeDef  sFilterConfig;
  static CanTxMsgTypeDef       TxMessage;
  static CanRxMsgTypeDef       RxMessage;

  hcan1.Instance = CAN1;
      hcan1.pTxMsg = &TxMessage;
  hcan1.pRxMsg = &RxMessage;

  hcan1.Init.Prescaler = 8;
  hcan1.Init.Mode = CAN_MODE_NORMAL;
  hcan1.Init.SJW = CAN_SJW_1TQ;
  hcan1.Init.BS1 = CAN_BS1_6TQ;
  hcan1.Init.BS2 = CAN_BS2_3TQ;
  hcan1.Init.TTCM = DISABLE;
  hcan1.Init.ABOM = DISABLE;
  hcan1.Init.AWUM = DISABLE;
  hcan1.Init.NART = DISABLE;
  hcan1.Init.RFLM = DISABLE;
  hcan1.Init.TXFP = DISABLE;
  if (HAL_CAN_Init(&hcan1) != HAL_OK)
  {
_Error_Handler(__FILE__, __LINE__);
  }
      /*##-2- Configure the CAN Filter ###########################################*/
  sFilterConfig.FilterNumber = 0;
  sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
  sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
  sFilterConfig.FilterIdHigh = 0x0000;
  sFilterConfig.FilterIdLow = 0x0000;
  sFilterConfig.FilterMaskIdHigh = 0x0000;
  sFilterConfig.FilterMaskIdLow = 0x0000;
  sFilterConfig.FilterFIFOAssignment = 0;
  sFilterConfig.FilterActivation = ENABLE;
  sFilterConfig.BankNumber = 14;

  if (HAL_CAN_ConfigFilter(&hcan1, &sFilterConfig) != HAL_OK)
  {
/* Filter configuration Error */
Error_Handler();
  }

  /*##-3- Configure Transmission process #####################################*/
  hcan1.pTxMsg->StdId = 0x321;
  hcan1.pTxMsg->ExtId = 0x01;
  hcan1.pTxMsg->RTR = CAN_RTR_DATA;
  hcan1.pTxMsg->IDE = CAN_ID_STD;
  hcan1.pTxMsg->DLC = 8;

}
在主函数的whil（1）里
      for(uint8_t ii = 0; ii < 8; ii++)
      {
            hcan1.pTxMsg->Data[ii] = 0xAA;
      }
      HAL_CAN_Transmit(&hcan1,10);

接收端
static void MX_CAN1_Init(void)
{
      CAN_FilterConfTypeDef  sFilterConfig;
  static CanTxMsgTypeDef       TxMessage;
  static CanRxMsgTypeDef       RxMessage;

  hcan1.Instance = CAN1;
      hcan1.pTxMsg = &TxMessage;
  hcan1.pRxMsg = &RxMessage;

  hcan1.Init.Prescaler = 8;
  hcan1.Init.Mode = CAN_MODE_NORMAL;
  hcan1.Init.SJW = CAN_SJW_1TQ;
  hcan1.Init.BS1 = CAN_BS1_6TQ;
  hcan1.Init.BS2 = CAN_BS2_3TQ;
  hcan1.Init.TTCM = DISABLE;
  hcan1.Init.ABOM = DISABLE;
  hcan1.Init.AWUM = DISABLE;
  hcan1.Init.NART = DISABLE;
  hcan1.Init.RFLM = DISABLE;
  hcan1.Init.TXFP = DISABLE;
  if (HAL_CAN_Init(&hcan1) != HAL_OK)
  {
_Error_Handler(__FILE__, __LINE__);
  }
      /*##-2- Configure the CAN Filter ###########################################*/
  sFilterConfig.FilterNumber = 0;
  sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
  sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
  sFilterConfig.FilterIdHigh = 0x0000;
  sFilterConfig.FilterIdLow = 0x0000;
  sFilterConfig.FilterMaskIdHigh = 0x0000;
  sFilterConfig.FilterMaskIdLow = 0x0000;
  sFilterConfig.FilterFIFOAssignment = 0;
  sFilterConfig.FilterActivation = ENABLE;
  sFilterConfig.BankNumber = 14;

  if (HAL_CAN_ConfigFilter(&hcan1, &sFilterConfig) != HAL_OK)
  {
/* Filter configuration Error */
Error_Handler();
  }

  /*##-3- Configure Transmission process #####################################*/
  hcan1.pTxMsg->StdId = 0x321;
  hcan1.pTxMsg->ExtId = 0x01;
  hcan1.pTxMsg->RTR = CAN_RTR_DATA;
  hcan1.pTxMsg->IDE = CAN_ID_STD;
  hcan1.pTxMsg->DLC = 8;
}

主函数里
      __HAL_CAN_ENABLE_IT(&hcan1,CAN_IT_FF0);
      HAL_NVIC_EnableIRQ(CAN1_RX0_IRQn);
      if (HAL_CAN_Receive_IT(&hcan1, CAN_FIFO0) != HAL_OK)
  {
/* Reception Error */
Error_Handler();
  }