STM8AF开发板无法实现CAN通信怎么解决？

各位大神
       我是STM8的新手，最近买了两套STM8A-DISCOVERY开发板，基于STM8AF52芯片开发，原本想着将两块开发板的CAN口对接，进行一些通信测试，但发现无法实现CAN通信，一下是我的代码，请各位大神指点指点：

主循环中的实现：

main()
{
....
        CLK_Config();
        CAN_Config();

....
        while(1)
        {
                ...
                 /* Transmit Parameters*/
                Tx_Id = 0;
                Tx_IDE = CAN_Id_Standard;
                Tx_RTR = CAN_RTR_Data;
                Tx_DLC = 1;
                Tx_Data[0] = i;
                GPIO_WriteLow(GPIOA, (GPIO_Pin_TypeDef)GPIO_PIN_3);
                 /* Sender send Frame */
                status = CAN_Transmit(Tx_Id,Tx_IDE,Tx_RTR,Tx_DLC,Tx_Data);

                ...
         }
}

void CLK_Config(void)
{
  /* Initialization of the clock */
  /* Clock divider to HSI/1 */
  CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
}


void CAN_Config(void)
{
  CAN_InitStatus_TypeDef status = CAN_InitStatus_Failed;

  /* Filter Parameters */
  CAN_FilterNumber_TypeDef CAN_FilterNumber;
  FunctionalState CAN_FilterActivation;
  CAN_FilterMode_TypeDef CAN_FilterMode;
  CAN_FilterScale_TypeDef CAN_FilterScale;
  UINT8 CAN_FilterID1;
  UINT8 CAN_FilterID2;
  UINT8 CAN_FilterID3;
  UINT8 CAN_FilterID4;
  UINT8 CAN_FilterIDMask1;
  UINT8 CAN_FilterIDMask2;
  UINT8 CAN_FilterIDMask3;
  UINT8 CAN_FilterIDMask4;

  /* Init Parameters*/
  CAN_MasterCtrl_TypeDef CAN_MasterCtrl;
  CAN_Mode_TypeDef CAN_Mode;
  CAN_SynJumpWidth_TypeDef CAN_SynJumpWidth;
  CAN_BitSeg1_TypeDef CAN_BitSeg1;
  CAN_BitSeg2_TypeDef CAN_BitSeg2;
  UINT8 CAN_Prescaler;  

  /* CAN register init */
  CAN_DeInit();

  /* CAN  init */
  CAN_MasterCtrl=CAN_MasterCtrl_AllDisabled;
  CAN_Mode = CAN_Mode_Normal;
  CAN_SynJumpWidth = CAN_SynJumpWidth_1TimeQuantum;
  CAN_BitSeg1 = CAN_BitSeg1_8TimeQuantum;
  CAN_BitSeg2 = CAN_BitSeg2_7TimeQuantum;
  CAN_Prescaler = 1;
  status = CAN_Init(CAN_MasterCtrl, CAN_Mode, CAN_SynJumpWidth, CAN_BitSeg1,
                    CAN_BitSeg2, CAN_Prescaler);

  /* CAN filter init */
  CAN_FilterNumber = CAN_FilterNumber_0;
  CAN_FilterActivation = ENABLE;
  CAN_FilterMode = CAN_FilterMode_IdMask;
  CAN_FilterScale = CAN_FilterScale_32Bit;
  CAN_FilterID1=0;  
  CAN_FilterID2=0;
  CAN_FilterID3=0;
  CAN_FilterID4=0;
  CAN_FilterIDMask1=0;
  CAN_FilterIDMask2=0;
  CAN_FilterIDMask3=0;
  CAN_FilterIDMask4=0;  
  CAN_FilterInit(CAN_FilterNumber, CAN_FilterActivation, CAN_FilterMode,
                 CAN_FilterScale,CAN_FilterID1, CAN_FilterID2, CAN_FilterID3,
                 CAN_FilterID4,CAN_FilterIDMask1, CAN_FilterIDMask2,
                 CAN_FilterIDMask3, CAN_FilterIDMask4);

  /* Enable Fifo message pending interrupt*/
  /* Message reception is done by CAN_RX ISR*/
  CAN_ITConfig(CAN_IT_FMP, ENABLE);
}


中断配置如下：

/**
  * @brief CAN RX Interrupt routine.
  * @param  None
  * @retval None
  */
INTERRUPT_HANDLER(CAN_RX_IRQHandler, 8)
{
  /* In order to detect unexpected events during development,
     it is recommended to set a breakpoint on the following instruction.
  */
        /* Receiver Receives Frame */
        CAN_Receive();
}


同时在stm8_interrupt_vector.c文件中的中断向量表里修改如下：
        {0x82, (interrupt_handler_t)CAN_RX_IRQHandler}, /* irq8  */

将两块开发板CAN口对接，然后我通过调试器将断点设置在中断响应函数的CAN_Receive()一行，无任何中断响应。请问，这个CAN通信的问题有可能出在哪里？