如下是STM32F4调试的串口程序：
 
#include "usart2.h"
  
 
 
 void MyUartInit(void )
 {
 //NVIC_Config();                
  STM_EVAL_COMInit();     
  USART_Configuration(115200);      
 // USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); 
 
} 
 
 
 
void STM_EVAL_COMInit(void) 
{ 
  GPIO_InitTypeDef GPIO_InitStructure; 
 
  /* Enable GPIO clock */ 
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); 
  /* Enable UART clock */ 
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); 
  
  /* Connect PXx to USARTx_Tx*/ 
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1); 
  /* Connect PXx to USARTx_Rx*/ 
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1); 
 
  /* Configure USART Tx as alternate function  */ 
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; 
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 
 
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; 
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
  GPIO_Init(GPIOB, &GPIO_InitStructure); 
 
  /* Configure USART Rx as alternate function  */ 
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; 
  GPIO_Init(GPIOB, &GPIO_InitStructure); 
} 
 
 
 
void USART_Configuration(int BaudRate) 
{ 
    USART_InitTypeDef USART_InitStructure; 
 
    USART_InitStructure.USART_BaudRate = BaudRate; 
    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; 
    USART_Init(USART1, &USART_InitStructure); /* Configure USART1 basic and asynchronous paramters */ 
    USART_Cmd(USART1, ENABLE);   /* Enable USART1 */ 
} 
 
 
void NVIC_Config(void) 
{ 
  NVIC_InitTypeDef NVIC_InitStructure; 
 
  /* Enable the USARTx Interrupt */ 
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; 
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; 
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; 
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
  NVIC_Init(&NVIC_InitStructure); 
} 
 
 
int fputc(int ch, FILE *f) 
{ 
  /* Place your implementation of fputc here */ 
  /* e.g. write a character to the USART */ 
  USART_SendData(USART1, (u8) ch); 
 
  /* Loop until the end of transmission */ 
  while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) 
  { 
  } 
 
  return ch; 
}
int fgetc(FILE *f)
{
  
  while (USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET);
  return (int)USART_ReceiveData(USART2);
}

void USART1_IRQHandler(void)
{
char c;
 if(USART_GetFlagStatus(USART1,USART_FLAG_RXNE)==SET)
 {
   c = USART_ReceiveData(USART1);
   USART_SendData(USART1,c);
   USART_ClearITPendingBit(USART1,USART_IT_RXNE);
// GPIO_ToggleBits(GPIOD,GPIO_Pin_14);
 }
}

void  Usart_Test(void)
{
 int i=0;
 for(i=0 ; i

试试看 怎么样呀！

good

试试看 怎么样呀！

 好

调试

调试

调试

ddd

请教一下楼主，F429DISCOVERY的PA9和PA10并没有通过电平转换芯片连接到上位机，这个怎么解决的？