不需要连线 实现内部的数据通信，但是编译通过但就是无法打印出来！我用的是3.5的库函数！#include "stm32f10x.h"#include"stdio.h" 

voidRCC_Config(void);voidGPIO_Config(void);voidUSART_Config(void);voidCAN_Config(void);int main(void) {uint8_t TransmitMailbox = 0;     CanTxMsg TxMessage;     CanRxMsg RxMessage;uint32_t i = 0;     RCC_Config();GPIO_Config();  USART_Config();   CAN_Config();TxMessage.ExtId=0x00AA0000;TxMessage.IDE = CAN_ID_EXT;TxMessage.RTR = CAN_RTR_DATA; TxMessage.DLC = 8;TxMessage.Data[0] = 0x00;TxMessage.Data[1] = 0x11;
     TransmitMailbox=CAN_Transmit(CAN1, &TxMessage);while((CAN_TransmitStatus(CAN1, TransmitMailbox) != CANTXOK) && (i != 0xFFFF))printf(" The CAN1 has sended data:0x%x,0x%x ",TxMessage.Data[0],TxMessage.Data[1]);  while((CAN_MessagePending(CAN1, CAN_FIFO0) < 1) && (i != 0xFFFF))RxMessage.StdId = 0x00;RxMessage.IDE = CAN_ID_EXT;RxMessage.DLC = 0;RxMessage.Data[0] = 0x00;RxMessage.Data[1] = 0x00;CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);printf(" The CAN has Receive data :0x%x,0x%x ",RxMessage.Data[0], RxMessage.Data[1]); while(1);}void RCC_Config(void){SystemInit();RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA  ,ENABLE);    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);    RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);}void  GPIO_Config(void){    GPIO_InitTypeDef GPIO_InitStructure;    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;  GPIO_Init(GPIOA, &GPIO_InitStructure);

 

/* Configure USART1 Tx (PA.09) as alternate function push-pull */
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
 GPIO_Init(GPIOA, &GPIO_InitStructure);
 
 /* Configure USART1 Rx (PA.10) as input floating */
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
 GPIO_Init(GPIOA, &GPIO_InitStructure);}void CAN_Config(void)
{   CAN_InitTypeDef CAN_InitStructure;   CAN_FilterInitTypeDef CAN_FilterInitStructure;   CAN_DeInit(CAN1);   CAN_StructInit(&CAN_InitStructure);
   CAN_InitStructure.CAN_TTCM = DISABLE;   CAN_InitStructure.CAN_ABOM = DISABLE;   CAN_InitStructure.CAN_AWUM = DISABLE;   CAN_InitStructure.CAN_NART = DISABLE;   CAN_InitStructure.CAN_RFLM = ENABLE;    CAN_InitStructure.CAN_TXFP = DISABLE;   CAN_InitStructure.CAN_Mode = CAN_Mode_LoopBack;    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 = 5;   CAN_Init(CAN1,&CAN_InitStructure);
CAN_FilterInitStructure.CAN_FilterNumber = 0;    CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;    CAN_FilterInitStructure.CAN_FilterIdHigh = 0x00AA;    CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000;    CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x00FF;    CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;    CAN_FilterInitStructure.CAN_FilterFIFOAssignment =0;    CAN_FilterInit(&CAN_FilterInitStructure);
}void USART_Config(){USART_InitTypeDef USART_InitStructure;//USART_ClockInitTypeDef USART_ClockInitStructure;USART_InitStructure.USART_BaudRate = 9600;USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; /* Configure USART1 */ USART_Init(USART1, &USART_InitStructure); /* Enable USART1 Receive and Transmit interrupts */ /* Enable the USART1 */ USART_Cmd(USART1, ENABLE);} int fputc(int ch,FILE*f){USART_SendData(USART1,(u8) ch);while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET);return ch;}