stm32正常模式下的CAN测试程序问题

我用的STM32F103VC控制器外接一个TJA1050CAN收发器，加一个CAN分析仪(iTEK公司的USBCAN-II)进行测试，stm32的CAN测试程序如下1、采用回环模式，使能CAN接收中断，调试发现，可以进入接收中断，而且接收的数据与发送的数据相同，故自发自收没有问题了，2、将回环模式改为正常模式，stm32发送，分析仪监听，没有监测到数据，而且stm32的错误寄存器指示显性位错误(bit dom error。
CAN初始化及配置程序如下：
void CAN_INIT(void)
{
   GPIO_InitTypeDef GPIO_InitStructure;
   CAN_InitTypeDef        CAN_InitStructure;
   CAN_FilterInitTypeDef  CAN_FilterInitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1 | RCC_APB2Periph_GPIOB, ENABLE);//时钟使能
  GPIO_PinRemapConfig(GPIO_Remap1_CAN1,ENABLE);//CAN管脚重映射到PB8-9

  /* Configure CAN pin: RX =  PB8 */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* Configure CAN pin: TX =  PB9 */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  CAN_DeInit(CAN1);
  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_LoopBack;         //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=18;
  CAN_Init(CAN1, &CAN_InitStructure);

  /* CAN filter init */
  CAN_FilterInitStructure.CAN_FilterNumber=1;
  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=CAN_FIFO0;
  CAN_FilterInitStructure.CAN_FilterActivation=ENABLE;
  CAN_FilterInit(&CAN_FilterInitStructure);

  /* CAN FIFO0 message pending interrupt enable */
  CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);
}
//CAN发送函数
void can_write(uint16_t id, uint8_t *data_buf, uint8_t len)   
{
  /* transmit 1 message */
  TxMessage.StdId = id;
  TxMessage.ExtId = 0x0000;
  TxMessage.IDE = CAN_ID_STD;
  TxMessage.RTR = CAN_RTR_DATA;
  TxMessage.DLC = len;
  memcpy(TxMessage.Data, data_buf, len);

  CAN_Transmit(CAN1, &TxMessage);
}

CAN中断处理函数
void USB_LP_CAN1_RX0_IRQHandler(void)
{
    CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);
    printf("recv a framern");
}

敢问大神问题出在什么地方？忘指点一二，小弟不胜感激！