STM32的CAN总线引脚无波形输出，附代码，请教编程错在何处。

只看该作者 · 2012-8-6 12:00

红牛开发板，STM32f103ZET6的芯片，板子上的CAN收发器为MCP2551。用STM32与周立功的CAN-1模块通信，因此CAN总线是有两个节点的。两个节点均配有终端电阻。之前用Loopback模式自测通过。使用重映射，STM32的PB8和PB9引脚上无任何波形。代码如下。不知道是哪里配置错了，求指正，不胜感激！
但求CAN引脚能有波形输出就好。
#include "stm32f10x.h"
#include "stdio.h"

void RCC_Configuration(void);
void GPIO_Configuration(void);
void CAN_Config(void);

CanTxMsg TxMessage;
CanRxMsg RxMessage;
CAN_InitTypeDef       CAN_InitStructure;
CAN_FilterInitTypeDef  CAN_FilterInitStructure;

int main(void)
{
RCC_Configuration();
CAN_Config();

while(1)
{

CAN_Transmit(CAN1,&TxMessage);

}

}

void RCC_Configuration(void)
{

  ErrorStatus HSEStartUpStatus;

  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)
  {
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);

/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK */
RCC_PCLK1Config(RCC_HCLK_Div1);

/* Select HSE as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);

/* Wait till HSE is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x04)
{
}
  }

}

void CAN_Config(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;

  /* GPIO clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

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

  /* Configure CAN pin: TX */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  GPIO_PinRemapConfig(GPIO_Remap1_CAN1 , ENABLE);

  /* CANx Periph clock enable */

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);

  /* CAN register init */
  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_Normal;

  /* CAN Baudrate = 1MBps*/
  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 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);

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

  TxMessage.DLC = 1;
}