标题:
51单片机串口通信程序
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作者:
苟文强
时间:
2017-9-21 23:46
标题:
51单片机串口通信程序
51单片机串口通信
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar a;
sbit d = P2^3;
void send(unsigned char dat)
{
SBUF = dat;
while(!TI);
TI=0;
}
void init()
{
TMOD = 0x20; //设置定时器1为工作方式2
TH1 = 0xfd;
TL1 = 0xfd;
TR1 = 1; //开定时器1
REN = 1; //开串口通信.
SM0 = 0; //设置串口通信方式1
SM1 = 1;
EA = 1; //开总中断.
ES = 1; //开串口中断.
}
void delay(uint z)
{
uint x, y;
for(x = z; x > 0; x--)
for(y = 110; y > 0; y--);
}
void main()
{
init();
a = '4';
while(1)
{
if(a == '1')
{
d = 0; delay(400);
d = 1; delay(400);
}
else if(a == '2')
{
d = 0; delay(200);
d = 1; delay(200);
}
else if(a == '3')
{
d = 0; delay(100);
d = 1; delay(100);
}
else if(a == '4')
{
d = 1;
}
}
}
void ser() interrupt 4
{
if (RI == 1)
{
RI = 0;
a = SBUF; //中间变量.
send(a);
}
}
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