串口通信问题

Alan_Chou · 发表于 2012-8-16 15:18:03

这是一个串口通信程序，编译通过了，但在串口调试助手中毫无显示，求各位大神帮忙之指点一下！！

#include "stm32f10x.h"
#include <stdio.h>

#define unsigned uint32_t vu32;
GPIO_InitTypeDef GPIO_InitSructure;
USART_InitTypeDef USART_InitStructure;

void Delay (vu32 ncount);
uint8_t GetKey(void);
void OutputString(uint8_t *buffp);
void PutChar(uint8_t c);
uint32_t SerialKeyPressed(uint8_t *key);

#ifdef __GNUC__
/* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
set to 'Yes') calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */

void Delay (vu32 nCount)
{
for(; nCount != 0;nCount--);
}

int main (void)
{
uint8_t inputstr[128];
/****************配置GPIO使能LED********************/
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_Init(GPIOB,&GPIO_InitStructure);/*GPIO配置完成*/
/*****************关闭所有LED灯*******************/
GPIO_SetBits(GPIOA,GPIO_Pin_2|GPIO_Pin_3);
GPIO_SetBits(GPIOB,GPIO_Pin_2);

/**********************USART配置************************/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);/*使能USART时钟*/

/*******************配置的具体参数**********************/
USART_InitStructure.USART_BaudRate = 115200;
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_Tx|USART_Mode_Rx;

USART_Init(USART1,&USART_InitStructure); /*USART配置完成*/
USART_Cmd(USART1,ENABLE);/*使能USART1*/

printf("\n Yo!Yo!Check Now!\n");
printf("\n This is Zhou Qu Speaking!\n");
printf("\n STM32 is ready to recieve:\n") ;

while (1)
{
GPIO_SetBits(GPIOA,GPIO_Pin_2|GPIO_Pin_3);
GPIO_SetBits(GPIOB,GPIO_Pin_2);/*关闭所有LED指示灯*/

  OutputString(inputstr);
  printf("\nYour input is:\n%s\n",inputstr);
  GPIO_ResetBits(GPIOA,GPIO_Pin_2|GPIO_Pin_3);
  GPIO_ResetBits(GPIOB,GPIO_Pin_2);/* 打开所有LED指示灯*/
  Delay (0x2FFFF);
  GPIO_SetBits(GPIOA,GPIO_Pin_2|GPIO_Pin_3);
  GPIO_SetBits(GPIOB,GPIO_Pin_2);/*再次关闭所有LED指示灯*/
}
}

PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the USART */
USART_SendData(USART1, (uint8_t) ch);

/* Loop until the end of transmission */
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
{
}

return ch;
}

/***********************************子函数*****************************************/

void OutputString (uint8_t *buffp)
{
uint8_t c = 0;
uint16_t read_bytes = 0;
do
{
  c=GetKey();
  if(c=='\r'){break;}
  if(c=='\b')
  {
   if(read_bytes>0)
   {
    printf("\b \b");
    read_bytes--;
   }
   continue;
  }

  if(read_bytes >= 128)
  {
   printf("data overflow!\n");
   continue;
  }
  if(c>=0x20 && c<=0x7E)
  {
   buffp[read_bytes++]=c;
   utChar(c);
  }
}
while(1);
printf("\n\r");
buffp[read_bytes] = '\0';
}
uint8_t GetKey(void)
{
uint8_t key=0;
while(1)
{
  if(SerialKeyPressed((uint8_t*)&key)) break;
}
return key;
}

uint32_t SerialKeyPressed(uint8_t *key)
{
if(USART_GetFlagStatus(USART1,USART_FLAG_RXNE)!=RESET)
{
  *key = (uint8_t)USART1->DR;
  return 1;
}
else {
    return 0;
  }
}