[嵌入式]51单片机串口通信--发送字符、接收字符、发送字符串、接收字符串

uart.c

#include <reg52.h>
#include "uart.h"

#define uint unsigned int
#define uchar unsigned char
typedef unsigned int u16;	  //对数据类型进行声明定义
typedef unsigned char u8;

//串口初始化函数  9600
void URATinit()
{
 TMOD=0x20;
 SCON=0x50;
 TR1=1;
 TH1=0xfd;
 TL1=0xfd;
 EA=1;
 ES=1;
}

//发送一个字符
void Uart_Send_Byte(unsigned char dat)
{
 	SBUF = dat;
	while(!TI);
	TI=0;
}

//发送一串字符串
void Uart_Send_String(unsigned char *p)
{
 	while(*p)
	{
	 	Uart_Send_Byte(*p++);	
	} 
}

u8 ch,i;
u8 RX_BUF[10],RX_DAT[10],RX_CNT=0,RX_OVER=0;
//串口接收中断
void Uart_IRQ() interrupt 4
{
 /*if(RI)
 {  
   RI=0;//清标志位 
   ch=SBUF;
   if(ch=='A') {}
 } */
 if(RI)
 {  
   ch=SBUF;
   if(ch!='}')
   {
	  RX_BUF[RX_CNT++]=ch;
   }
   else	//结束
   {
	 for(i=0;i<RX_CNT;i++)
	 {
	  	RX_DAT[i]=RX_BUF[i];
	 }
	 
	 RX_CNT=0;
	 RX_OVER=1;
   }
   RI=0;//清标志位 
 } 	 
}

/*if(RX_DAT[0]=='N' && RX_DAT[1]=='A'&& RX_DAT[2]=='M'&& RX_DAT[3]=='E')
		{
		  Uart_Send_String("单片机");delay(1000);
		} */
		/*if(strstr(RX_DAT,"{\"get\":\"state\"}")!=NULL)
		{
		  Uart_Send_String("单片机");
		}
		else
		{
		  Uart_Send_String(RX_DAT);
		}*/		 

uart.h

#ifndef  __UART_H__
#define  __UART_H__

extern unsigned char RX_DAT[10],RX_OVER;
extern unsigned char i;
//函数
void URATinit();
void Uart_Send_Byte(unsigned char dat);
void Uart_Send_String(unsigned char *p);
void Uart_IRQ();
#endif

main.c

#include <reg52.h>
#include "Delay.h"	//包含Delay头文件
#include "uart.h"
#include "string.h"
//主函数

void  main()
{
 URATinit( );
 //Uart_Send_Byte('A');
 while(1)
 {
  	/*if(RX_DAT[0]=='N' && RX_DAT[1]=='A'&& RX_DAT[2]=='M'&& RX_DAT[3]=='E')
		{
		  Uart_Send_String("单片机");delay(1000);
		} */
		/*if(strstr(RX_DAT,"{\"get\":\"state\"}")!=NULL)
		{
		  Uart_Send_String("单片机");
		}
		else
		{
		  Uart_Send_String(RX_DAT);
		}*/	
		RX_OVER=0;
	}
	
	/*Uart_Send_String("单片机");delay(1000);
	Uart_Send_String("单片机");
	delay(1000); */
 }
}