用单片机控制LED灯（项目）

#include <reg52.h>
#define uchar unsigned char
sbit LED_RED = P2^0;
sbit LED_GREEN = P2^1;
sbit LED_BLUE = P2^2;

//要显示的颜色值
uchar COLOR_RED = 0xff;
uchar COLOR_GREEN = 0xcc;
uchar COLOR_BLUE = 0x33;

uchar i = 0;

//初始化定时器，用于控制PWM波
void Init_INT0(){
    TMOD = 0x02;//工作方式2，8位自动装置定时器
    TH0 = 0xf0;
    TL0 = TH0;
    ET0 = 1;
    EA = 1;
    TR0 = 1;
}

void main(){
    Init_INT0();
    while(1);
}

void INT0_Resolve() interrupt 1{
    //i的值从0-255循环，当i到达255时，i++的结果为0
    i++;

    //红色LED的PWM波形
    if(i < COLOR_RED){
        LED_RED = 1;
    }else{
        LED_RED = 0;
    }
    //绿色LED的PWM波形
    if(i < COLOR_GREEN){
        LED_GREEN = 1;
    }else{
        LED_GREEN = 0;
    }
    //蓝色LED的PWM波形
    if(i < COLOR_BLUE){
        LED_BLUE = 1;
    }else{
        LED_BLUE = 0;
    }
}