新人关于PC与单片机开发板的串口通信问题 -

#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit S1=P3^5;
sbit S2=P3^4;
sbit S3=P3^3;
sbit S4=P3^2;
sbit led1=P1^0;
sbit led2=P1^1;
sbit led3=P1^2;
sbit led4=P1^3;
uchar aa=0xfe,num = 0,a;
uchar i = 0,j = 0,k = 0,t = 0;
void delay(unsigned int t) ;
void delay2(unsigned int z);
void keyscan();
void initial_com();
void initial_com()
{
//SCON = 0x50;
TMOD|= 0x20;
TH1 = 0xfd;
TL1 = 0xfd;
TR1 = 1;
REN = 1;
SM0 = 0;
SM1 = 1;
EA = 1;
ES = 0; //允许串口中断
SBUF = 0x01;
while(!TI);
TI = 0; //串口中断
ES = 1;
}
void keyscan() //扫描按键程序
{
if(S1==0)
{
delay(5);
if(S1==0)
{
i++;
}
while(!S1);
delay(5);
while(!S1);
}
if(S2==0)
{
delay(5);
if(S2==0)
{
j++;
}
while(!S2);
delay(5);
while(!S2);
}
if(S3==0)
{
delay(5);
if(S3==0)
{
k++;
}
while(!S3);
delay(5);
while(!S3);
}
if(S4==0)
{
delay(5);
if(S4==0)
{
t++;
}
while(!S4);
delay(5);
while(!S4);
}
}
void delay(unsigned int t)
{
unsigned int x,y;
for(x=t;x>0;x--)
for(y=110;y>0;y--);
}
void delay2(unsigned int z)
{
while(--z);
}
void main()
{ //P1=0xff;
unsigned int CYCLE=600,PWM_LOW=0;//定义周期(呼吸灯部分)
// aa = 0xfe;
initial_com();
while(1)
{
if(num==1)
{
ES = 0;
num = 0;
SBUF = a;
SBUF = i;
while(!TI);
TI = 0;
ES = 1;
}
}
}
void ser() interrupt 4
{
unsigned int CYCLE=600,PWM_LOW=0;
keyscan();
RI=0;
// P1=SBUF; //接收数据SBUF，即将计算机的数据接收。
i = SBUF;
a=SBUF;
// ledoff=SBUF;
num=1;
//aa=0xfe;
/*****************呼吸灯部分*******************/
if(a == 0x03)
{
while (1) //主循环
{ //keyscan();
//if(S1==0)
// {
// delay(5);
// if(S1==0)
// {
led1=1;
delay2(150000);
for(PWM_LOW=1;PWM_LOW<CYCLE;PWM_LOW++)//PWM_LOW表示低电平时间
{
led1=0; //点亮LED
delay2(PWM_LOW)
led1=1; //熄灭LED
delay2(CYCLE-PWM_LOW)
}
//LED0=0;
for(PWM_LOW=CYCLE-1;PWM_LOW>0;PWM_LOW--)
led1=0;
delay2(PWM_LOW);
led1=1;
delay2(CYCLE-PWM_LOW);
}
}
}
/*****控制灯******/
if(a == 0x01)
{
P1 = aa;
delay(100);
aa = _crol_(aa,1);
}
if(a == 0x00)
{
P1 = 0xff;
}
/**************流水灯部分****************/
if(a == 0x02) //偶数整除等于，按键在偶次数才触发流水灯
{
P1=aa;;
delay(500);
aa=_crol_(aa,1);
}
/*************按键控制部分,是不是我不应该写在这个中断里面???写在主函数上也是没反应***************/
if(i==1)
{
delay(5);
if(i==1)
{
led1= 0;
}
}
if(i==2)
{
P1=aa;;
delay(500);
aa=_crol_(aa,1);
}
if(i==3)
{
while(1)
{
led1= 1;
delay2(150000);
for(PWM_LOW=1;PWM_LOW<CYCLE;PWM_LOW++)
{
led1= 0;
delay2(PWM_LOW);
led1=1;
delay2(CYCLE-PWM_LOW);
}
for(PWM_LOW=CYCLE-1;PWM_LOW>0;PWM_LOW--)
{ //与逐渐变亮相反的过程
led1=0;
delay2(PWM_LOW);
led1=1;
delay2(CYCLE-PWM_LOW);
}
}
}
}

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