请教RS232串口通信程序失败的原因

lony · 发表于 2016-3-10 15:18:09

请大侠帮忙指点一下，以下程序是实现与电脑进行RS232串口通信，编译时没有错误和警告，下载至MINI开发板后，与电脑通信时无任何反应。
该程序是在原子哥的串口通信实验的基础稍微改动了一下，增加了发送中断程序。（改动之前实验是正常的）
#include "led.h"
#include "delay.h"
#include "sys.h"
#include "stdio.h"
#define USART_REC_LEN    200    //¶¨òå×î′ó½óêÕ×Ö½úêy 200
#define EN_USART1_RX 1 //ê1Äü￡¨1￡©/½ûÖ1￡¨0￡©′®¿ú1½óêÕ
u8 t=0;
u8 len;
u8 USART_RX_BUF[USART_REC_LEN];    //½óêÕ»o3å,×î′óUSART_REC_LEN¸ö×Ö½ú.
u16 USART_RX_STA=0;    //½óêÕ×′ì¬±ê¼Ç

#if SYSTEM_SUPPORT_OS
#include "includes.h" //ucos ê1óÃ
#endif
#if 1
#pragma import(__use_no_semihosting)
//±ê×¼¿aDèòaμÄÖ§3Öoˉêy
struct __FILE
{
int handle;

};

FILE __stdout;
//¶¨òå_sys_exit()òÔ±üÃaê1óÃ°ëÖ÷»úÄ￡ê½
_sys_exit(int x)
{
x = x;
}
//ÖØ¶¨òåfputcoˉêy
int fputc(int ch, FILE *f)
{
while((USART1->SR&0X40)==0);//Ñ-»··￠Ëí,Ö±μ½·￠Ëííê±Ï
USART1->DR = (u8) ch;
return ch;
}
#endif

void uart_init(u32 bound){
  //GPIO¶Ë¿úéèÖÃ
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //ê1ÄüUSART1￡¬GPIOAê±Öó

//USART1_TX GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3ö
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.9

  //USART1_RX    GPIOA.103õê¼»ˉ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿Õêäèë
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.10

  //Usart1 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//ÇàÕ¼óÅÏè¼¶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //×óóÅÏè¼¶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μàê1Äü
NVIC_Init(&NVIC_InitStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷

//USART 3õê¼»ˉéèÖÃ

USART_InitStructure.USART_BaudRate = bound;//′®¿ú2¨ìØÂê
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö3¤Îa8Î»êy¾Y¸ñê½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1Î»
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎTÆæÅ¼D￡ÑéÎ»
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //êÕ·￠Ä￡ê½

  USART_Init(USART1, &USART_InitStructure); //3õê¼»ˉ′®¿ú1
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï
  USART_ITConfig(USART1, USART_IT_TC, ENABLE);  //¿aÆô′®¿ú·￠ËíÖD¶Ï
USART_Cmd(USART1, ENABLE);                   //ê1Äü′®¿ú1

}

void USART1_IRQHandler(void)             //′®¿ú1ÖD¶Ï·tÎñ3ìDò
{
u8 Res;
#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntEnter();
#endif
if(USART_GetITStatus(USART1, USART_IT_RXNE))  //¼ì2é½óêÕÖD¶Ï·￠éúóë·ñ(½óêÕμ½μÄêy¾Y±ØDëêÇ0x0d 0x0a½áÎ2)
{
Res =USART_ReceiveData(USART1); //¶áè¡½óêÕμ½μÄêy¾Y

if((USART_RX_STA&0x8000)==0)//½óêÕÎ′íê3é
{
if(USART_RX_STA&0x4000)//½óêÕμ½áË0x0d
{
if(Res!=0x0a)USART_RX_STA=0;//½óêÕ′íÎó,ÖØDÂ¿aê¼
else USART_RX_STA|=0x8000; //½óêÕíê3éáË
}
else //»1Ã»êÕμ½0X0D
{
if(Res==0x0d)USART_RX_STA|=0x4000;
else
{
USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
USART_RX_STA++;
if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//½óêÕêy¾Y′íÎó,ÖØDÂ¿aê¼½óêÕ
}
}
}
   }
if(USART_GetITStatus(USART1, USART_IT_TC))
{
t++;
if(t<len)
   USART_SendData(USART1, USART_RX_BUF[t]);
   else
{
      t=0;
printf("\r\n\r\n");//2åèë»»DD
      printf("\r\nÇëêäèëDÅÏ￠￡o\r\n");
   }
}
#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntExit();
#endif
}

int main(void)
{
u16 times=0;
delay_init();            //Ñóê±oˉêy3õê¼»ˉ
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// éèÖÃÖD¶ÏóÅÏè¼¶·Ö×é2
uart_init(9600);    //′®¿ú3õê¼»ˉÎa9600
LED_Init();          //3õê¼»ˉóëLEDá¬½óμÄó2¼t½ó¿ú
printf("\r\nÇëêäèëDÅÏ￠￡o\r\n");
while(1)
{
if(USART_RX_STA&0x8000)
{
len=USART_RX_STA&0x3fff;//μÃμ½′Ë′Î½óêÕμ½μÄêy¾Y3¤¶è
printf("\r\nÄú·￠ËíμÄÏûÏ￠Îa:\r\n");
USART_SendData(USART1, USART_RX_BUF[t]); // ·￠Ëíêy¾Y
USART_RX_STA=0;
}
else
   ;
  }
}

正点原子 · 发表于 2016-3-12 00:00:32

仿真下，看看是不是死机了？

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