C51串口输出输入函数

外部声明 ComFun.h
Copyright 2003 http://www.cdle.net
All rights reserved.
明浩 E-mail: pnzwzw@cdle.net
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#include <reg51.h>

//串口初始化 晶振为11.0592M　方式1 波特率300－57600
void InitCom(unsigned char BaudRate)
{
unsigned char THTL;
switch (BaudRate)
{
case 1: THTL = 64; break; //波特率300
case 2: THTL = 160; break; //600
case 3: THTL = 208; break; //1200
case 4: THTL = 232; break; //2400
case 5: THTL = 244; break; //4800
case 6: THTL = 250; break; //9600
case 7: THTL = 253; break; //19200
case 8: THTL = 255; break; //57600
default: THTL = 208;
}
SCON = 0x50; //串口方式1,允许接收
TMOD = 0x20; //定时器1定时方式2
TCON = 0x40; //设定时器1开始计数
TH1 = THTL;
TL1 = THTL;
PCON = 0x80; //波特率加倍控制,SMOD位
RI = 0; //清收发标志
TI = 0;
TR1 = 1; //启动定时器
}

//向串口输出一个字符(非中断方式)
void ComOutChar(unsigned char OutData)
{
SBUF = OutData; //输出字符
while(!TI); //空语句判断字符是否发完
TI = 0; //清TI
}

//向串口输出一个回车换行
void ComOutEnter(void)
{
SBUF = 0x00;
while(!TI);
TI = 0;
SBUF = 0x0A;
while(!TI);
TI = 0;
}

//向串口输出一个字符串（非中断方式）
void ComOutStr(unsigned char *Str)
{
while(*Str != 0x00) //判断是否到了字符串的尾部
{
SBUF = *Str; //输出字符
while(!TI); //空语句判断字符是否发完
TI = 0; //清TI
Str++; //字符串指针加一
}
}

//从串口接收一个字符(非中断方式)
unsigned char ComInChar()
{
unsigned char InData;
while(!RI); //空语句判断字符是否收完
InData = SBUF; //保存COM缓冲字符
RI = 0; //清RI
return (InData); //返回收到的字符
}

//从串口接收一个定长字符串(非中断方式,只用于字符需有一个的idata字符串数组)
//如unsigned char *Str;
//unsigned char i[]="abcd";
//InHandStr = &i;
void ComInStr(unsigned char *Str)
{
while(*Str != 0x00) //判断是否到了字符串的尾部
{
while(!RI); //空语句判断字符是否收完
*Str = SBUF; //保存字符
RI = 0; //清RI
Str++; //字符串指针加一
}
}