USART2无法调通，求助

只看该作者 · 2013-8-5 16:12

本帖最后由 40750209 于 2013-8-6 10:36 编辑

USART2无法调通，配置串口2的程序如下所示，看有没有问题，求大神指点。

usart.c文件：

#include "usart1.h"
#include <stdarg.h>

void USART1_Config(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      /* USART2 mode config */
      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;
      USART_Init(USART2, &USART_InitStructure);
      USART_Cmd(USART2, ENABLE);
}

int fputc(int ch, FILE *f)
{
      /* 将Printf内容发往串口 */
      USART_SendData(USART2, (unsigned char) ch);

      while( USART_GetFlagStatus(USART2,USART_FLAG_TC)!= SET);
      return (ch);
}

static char *itoa(int value, char *string, int radix)
{
      int    i, d;
      int    flag = 0;
      char *ptr = string;

      /* This implementation only works for decimal numbers. */
      if (radix != 10)
      {
         *ptr = 0;
         return string;
      }

      if (!value)
      {
         *ptr++ = 0x30;
         *ptr = 0;
         return string;
      }

      /* if this is a negative value insert the minus sign. */
      if (value < 0)
      {
         *ptr++ = '-';

         /* Make the value positive. */
         value *= -1;
      }

      for (i = 10000; i > 0; i /= 10)
      {
         d = value / i;

         if (d || flag)
         {
            *ptr++ = (char)(d + 0x30);
            value -= (d * i);
            flag = 1;
         }
      }

      /* Null terminate the string. */
      *ptr = 0;

      return string;

} /* NCL_Itoa */

void USART1_printf(USART_TypeDef* USARTx, uint8_t *Data,...)
{
      const char *s;
      int d;
      char buf[16];

      va_list ap;
      va_start(ap, Data);

      while ( *Data != 0)    // 判断是否到达字符串结束符
      {
            if ( *Data == 0x5c )  //'\'
      {
      switch ( *++Data )
      {
            case 'r':                                                                //回车符
                     USART_SendData(USARTx, 0x0d);
                     Data ++;
            break;

            case 'n':                                                                //换行符
                     USART_SendData(USARTx, 0x0a);
                     Data ++;
            break;

            default:
                     Data ++;
            break;
      }
      }
      else if ( *Data == '%')
      {                                                                         //
      switch ( *++Data )
      {
            case 's':                                                                               //字符串
                     s = va_arg(ap, const char *);
      for ( ; *s; s++)
      {
            USART_SendData(USARTx,*s);
            while( USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET );
      }
            Data++;
            break;

      case 'd':                                                                               //十进制
      d = va_arg(ap, int);
      itoa(d, buf, 10);
      for (s = buf; *s; s++)
      {
            USART_SendData(USARTx,*s);
            while( USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET );
      }
      Data++;
      break;
               default:
                              Data++;
                  break;
      }
      } /* end of else if */
      else USART_SendData(USARTx, *Data++);
      while( USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET );
      }
}
/******************* (C) COPYRIGHT 2012 WildFire Team *****END OF FILE************/

Main.c文件：

#include "stm32f10x.h"
#include "usart1.h"

int main(void)
{

      USART1_Config();


      printf("\r\n this is a printf demo \r\n");

      printf("\r\n 欢迎使用 \r\n");

      USART1_printf(USART2, "\r\n This is a USART1_printf demo \r\n");

      USART1_printf(USART2, "\r\n ("__DATE__ " - " __TIME__ ") \r\n");

      for(;;)
      {

      }
}

只看该作者 · 2013-8-5 16:17

printf到usart2

int fputc(int ch, FILE *f)
{
/* 将Printf内容发往串口 */
USART_SendData(USART2, (unsigned char) ch);
// while (!(USART1->SR & USART_FLAG_TXE));
while( USART_GetFlagStatus(USART2,USART_FLAG_TC)!= SET);
return (ch);
}