按下按键1灯变亮，按下按键2灯变暗，用PWM调光，C程序怎么写

#include<reg52.h>

#include<intrins.h>

#define uchar unsigned char

#define uint unsigned int

#define LED P1//8个发光二级管

sbit key1=P3^5

sbit key2=P3^6

#define LED_ON() LED=0x00 //所宽庆族有灯亮

#define LED_OFF() LED=0xff //灭

#define LED_PWM_MAX 99

#define LED_PWM_MIN 0

uchar LED_Direction=0 //LED方向控制 0：变亮 1：差源变暗

uchar LED_PWM_Counter=0 //LED占空比

uchar count=0 //中断计数

bit flag=0//按键扫描标志位

void main()

{

P3=0xff //做输入口先写1

TMOD=0x01

TH0=0xff

TL0=0x47

EA=1

ET0=1

TR0=1

while(1)

{

if(flag)

{

if(key1==0)

{

if((LED_PWM_Count<=LED_PWM_MAX)&&(LED_Direction==0))

{

LED_PWM_Count++

if(LED_PWM_Count>LED_PWM_MAX)

{

LED_PWM_Count=LED_PWM_MAX

LED_Direction=1

}

}

}

if(key2==0)

{

if((LED_PWM_Count>=LED_PWM_MIN)&&(LED_Direction==1))

{

LED_PWM_Count--

if(LED_PWM_count<LED_PWM_MIN)

{

LED_PWM_Count=LED_PWM_MIN

LED_Direction=0

}

}

}

if(LED_PWM_Count>0)

{

LED_ON()

LED_PWM_Count--

}

else

{

LED_OFF()

}

}

}

}

void timer0() interrupt 1

{

TH0=0xff

TL0=0x47

if(++count>慎弊=10)//2ms扫描一次按键（不行可以把时间改小）

{

count=0

flag=1

}

}

大概就这个思路，如果不行你自己改改吧！

#include<氏镇笑reg51.h>歼含

#define uchar unsigned char

uchar pwm=50,cnt

sbit pluse=P1^0

sbit keyu=P1^4

sbit keyd=P1^5

void t0isr() interrupt 1

{

TH0=(65536-100)/256

TL0=(65536-100)%256

cnt++

if(pwm>0)

{

if(cnt>旅滑100)cnt=0

if(cnt<=pwm)pluse=1

else pluse=0

}

else pluse=0

}

main()

{

TMOD=0x01

TH0=(65536-100)/256

TL0=(65536-100)%256

TR0=1

ET0=1

EA=1

while(1)

{

if(keyu==0)

{

while(keyu==0)

pwm++

if(pwm>100)pwm=100

}

if(keyd==0)

{

while(keyd==0)

if(pwm>0)pwm--

}

}

}

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