stm32 CAN通讯接收必须加上仿真器?

只看该作者 · 2010-5-17 11:19

设置成正常模式后，接收数据的时候必须用仿真器来跑才能正确接到数据
离线后，直接上电总是收不到正确的数，何解？
代码：
int main(void)
{
#ifdef DEBUG
  debug();
#endif
  /* System Clocks Configuration */
  RCC_Configuration();
  /* NVIC Configuration */
  NVIC_Configuration();

  /* GPIO ports pins Configuration */
  GPIO_Configuration();

  while (1)
  {
//TestRx = CAN_Polling();
TestRx = CAN_Receving();

if (TestRx == FAILED)
  {
// Turn on led connected to GPIO_LED pin8 (LD3)
GPIO_SetBits(GPIO_LED, GPIO_Pin_11);
  }
  else
  {
// Turn on led connected to GPIO_LED pin6 (LD1)
GPIO_ResetBits(GPIO_LED, GPIO_Pin_11);
delay();
GPIO_SetBits(GPIO_LED, GPIO_Pin_11);
delay();

  }

  }
}

TestStatus CAN_Receving(void)
{
  CAN_InitTypeDef       CAN_InitStructure;
  CAN_FilterInitTypeDef  CAN_FilterInitStructure;
  CanRxMsg RxMessage;

  /* CAN register init */
  CAN_DeInit();
  CAN_StructInit(&CAN_InitStructure);
  /* CAN 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_8tq;
  CAN_InitStructure.CAN_BS2=CAN_BS2_7tq;
  CAN_InitStructure.CAN_Prescaler=2;
  CAN_Init(&CAN_InitStructure);
  /* CAN 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);
  /* receive */
  RxMessage.StdId=0x00;
  RxMessage.ExtId=0x00;
  RxMessage.IDE=CAN_ID_STD;
  RxMessage.IDE=0;
  RxMessage.DLC=0;
  RxMessage.FMI=0;
  RxMessage.Data[0]=0x00;
  RxMessage.Data[1]=0x00;

  CAN_Receive(CAN_FIFO0, &RxMessage);

if (RxMessage.StdId!=0x11)
  {
return FAILED;
  }

  /*
  if (RxMessage.ExtId!=0x22)
  {
return FAILED;
  }
  */
  if (RxMessage.IDE!=CAN_ID_STD)
  {
return FAILED;
  }
  if (RxMessage.DLC!=2)
  {
return FAILED;
  }
  if ((RxMessage.Data[0]<<8|RxMessage.Data[1])!=0x3344)
  {
return FAILED;
  }

  return PASSED; /* Test Passed */
}