STM32的CAN总线引脚无波形输出，附代码，请教编程错在何处。
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_FilterInitTypeDefCAN_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_InitTypeDefGPIO_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;
} Keil的工程。求指导啊。卡在这个问题上好久了。 2个建议。
1.使用重映射，需要打开AFIO的时钟
2.先检查CAN_TX引脚，看是否有数据发出 AFIO,和CAN BUS 时钟没有开启，，，，，， 3# IJK 3# IJK 重映射 4# lxj19901115 重映射时钟开了的，在CAN—Config()一开始就开了。Tx引脚没有波形啊 4# lxj19901115 CAN总线时钟也开启了，在CAN—config()函数的中间部分 3# IJK 时钟都开了的，没有任何波形啊啊啊啊 问题解决了。是MCP2551芯片的问题。换了VP230就正常了。 楼主这种情况是没有外接芯片导致的，接上芯片后就正常了
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