51單片機(jī)按鍵控制LED亮度-PWM實(shí)現(xiàn)

ID:199142 · 發(fā)表于 2020-6-6 15:46

#include "reg52.h"
sbit LED=P2^0 ;

unsigned char count; //計(jì)數(shù)
unsigned char PWM_VLAUE; //占空比比對(duì)值

typedef unsigned int uint16;
typedef unsigned char uint8;
sbit k1=P1^0;

void delay10ms(uint8 i)
{
uint16 j=100;
while(i--)
while(j--);
}
void timer0_init()
{
TMOD=0x02;
TH0=0x47;             //定時(shí)器溢出值設(shè)置，每隔200us發(fā)起一次中斷。
TL0=0X47;
TR0=1;
ET0=1;
EA=1;
count =0;
}
void time0() interrupt 1
{
count++;
    if(!k1)
{
delay10ms(1);
if(!k1)
{
   PWM_VLAUE+=1;
   }
         if(PWM_VLAUE>=10)
   {
   PWM_VLAUE=1;
   }

   }
if(count == PWM_VLAUE)    //判斷是否到了點(diǎn)亮LED的時(shí)候
      LED = 1;                   //點(diǎn)亮LED
if(count >= 10)          //當(dāng)前周期結(jié)束
{
      LED = 0;                   //熄滅LED
      count = 0;             //重新計(jì)時(shí)
}

}

void main()
{

count = 0;
PWM_VLAUE = 0;

LED = 1;          //默認(rèn)LED熄滅
timer0_init();    //定時(shí)器0初始化
while(1);
}

ID:1 · 發(fā)表于 2020-6-7 03:47

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