单片机必备知识--串口通讯

蓝桥杯单片机必备知识-----(12)串口通讯

串口初始化函数

//主程序中调用

void UartInit(void)		//9600bps@11.0592MHz
{
	SCON = 0x50;		//8位数据,可变波特率
	AUXR |= 0x01;		//串口1选择定时器2为波特率发生器
	AUXR &= 0xFB;		//定时器2时钟为Fosc/12,即12T
	T2L = 0xE8;		//设定定时初值
	T2H = 0xFF;		//设定定时初值
	AUXR |= 0x10;		//启动定时器2
}

发送字符串

void sendstring(unsigned char *str)//发送字符串
{
	while(*str !='\0')//等待\0
		{
			//sendbyte(*str++);//发送下一个字符
			SBUF=*str++; //将数据放进SBUF缓冲器
			while(TI==0); //等待发送数据完成
			 TI=0; //清除发送完成标志
		}
}

串口中断

void s() interrupt 4
{
	if(RI)
	{
		str1[scount++]=SBUF;   RI=1时接收数据，将数据放入SBUF
		RI = 0;
	}
}

整个代码粘贴

#include <stc15f2k60s2.h>
#include <stdio.h>

#define uchar unsigned char
#define uint unsigned int

uchar tab[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff};
uchar dspbuf[] = {10,10,10,10,10,10,10,10};
uchar temperature = 12;
unsigned char str1[20];
unsigned char scount = 0;
unsigned char str[20];

void load();
void sendstring(unsigned char *str);
void sendbyte(unsigned char dat);
void display();
void uart_proc();
void cls()
{
	P2 = (P2 & 0x1f) | 0x80;
	P0 = 0xff;
	P2 = 0x1f;
	
	P2 = (P2 & 0x1f) | 0xa0;
	P0 = 0x00;
	P2 = 0x1f;
}

void UartInit(void)		//9600bps@11.0592MHz
{
	SCON = 0x50;		//8位数据,可变波特率
	AUXR |= 0x01;		//串口1选择定时器2为波特率发生器
	AUXR &= 0xFB;		//定时器2时钟为Fosc/12,即12T
	T2L = 0xE8;		//设定定时初值
	T2H = 0xFF;		//设定定时初值
	AUXR |= 0x10;		//启动定时器2
}


void main()
{

	cls();
	AUXR = 0xc0;
	TMOD = 0x00;
	TL0 = 0xcd;
	TH0 = 0xd4;
	TR0 = 1;
	ET1 = 1;
	ES = 1;
	EA = 1;
	UartInit();
	while(1)
	{
		uart_proc();
	}
}

void s() interrupt 4
{
	if(RI)
	{
		str1[scount++]=SBUF;
		RI = 0;
	}
}
void uart_proc()
{
	if(scount > 0)
	{
		//sendstring(str1);	
		if(str1[scount-1] == 0xa)
		{
			sendstring(str1);		
			
			if((str1[0] =='s')  && (str1[1] == 0xd))
			{
				sprintf(str,"#temperature:%02u\r\n",(uint)(temperature));//发送Hello
				sendstring(str);
			}
			scount = 0;
			
		}
		else
			if(scount==6)
			{
	      sendstring(str1);		
				scount = 0;
			}
		
	}		
}




void sendstring(unsigned char *str)//发送字符串
{
	while(*str !='\0')//等待\0
		{
			//sendbyte(*str++);//发送下一个字符
			SBUF=*str++; //将数据放进SBUF缓冲器
			while(TI==0); //等待发送数据完成
			 TI=0; //清除发送完成标志
		}
}

本文地址：https://blog.csdn.net/qq_43710889/article/details/110082932