LED呼吸灯C源程序

1、*【使用说明】:晶振为利用定时器控制产生占空比可变的PW波按K3, PWM值增加，则占空比减小,LED灯渐亮按K4, PWM值减小，则占空比增加,LED灯渐暗当PWM值增加到最大值或减小到最小值时，蜂鸣器将报警丄"丄"丄"丄"丄"丄"尢 丄"KW 丄"丄"丄"KW 丄"丄"丄"%lx 丄"丄"±丄"vz 丄"” " £"* 4 * ,、* I * "、* *| * j *#in

2、clude<>#include<>sbit KI 二P34 ;/PWM值增加键sbit K2 =P3"5;/PWM值减少键sbit BEEP =P0'4;/蜂鸣器unsigned char PWM二0x7f ;/赋初值void Beep ();void delams (unsigned char ms):void delay(unsigned char t);丄"丄"丄"丄">丄">丄"卜 丄"%tx >丄"wx 丄">”void main

3、()Pl=0xff;/1ms延时常数频率调节脉宽调节TM0D=0x21 ;TH0=0xfc ;TL0=0x66 ;TH1二PWM ；TL1二0 ;EA=1;ETO=1;ET1=1;TRO=1 ;while (1)do if(PWMUOxff)PWM+ ;de1ayms(10); else Beep();while(Kl=0);do if (PW! =0x02)PWM- ;delayms (10);else Beep();while (K2=0);丄"卜丄"丄"丄"丄"丄"卜 丄"丄"丄"丄"；/

4、定时器0中断服务程序（频率）void timerO() interrupt 1TR1=OTHO二Oxfc ;TL0=0x66 ;TH1=PWM ;TRI二1 ;Pl二0x00 ;/启动输出k!丄"丄"%tx %l#丄"士 wx %fx 卜%tx丄 丄"丄"%tx Az丄"丄"%tz 丄"%A wx 丄"%tz «Jx 丄"丄"尢丄 丄"*7*/定时器1中断服务程序（脉宽）k!丄"丄"%tx %l#丄"xt# wx %fx 卜丄 丄&qu

5、ot;丄"%tz Az %f>丄"vz 丄"%tz 丄"%A wx 丄"%tz «Jx 丄"丄"尢丄 丄"*7*void timerl() interrupt 3TRI二0 ;0丄"丄"丄"" WX 丄"丄"> Jx 丄"丄"0丄"丄"WX " " > 卜WX "丄"丄"> Jx 丄"丄">/蜂鸣器子程序丄&

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