pwm控制led亮度2321321

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1、1242132132125351421321213213213213213PWM控制LED亮度PS：只是拿了先成的一個板子，帶下載口的，拉了8個I/O口出來，接了8個LED燈線路弄的不好，請大家見諒編寫環(huán)境：GCC20080512使用了一個計數(shù)器中斷圖片和視頻不是很清楚，希望大家諒解（1）/*第1，3，5，7個燈半亮，其余的全亮。*/#include#includevolatilesignedinttimecount=0;volatilesi

2、gnedlongtimecount2=0;unsignedintj=0;constintLED_code[]={160,0,160,0,160,0,160,0};SIGNAL(SIG_OVERFLOW0)//計數(shù)器溢出中斷{TCNT0=16;timecount++;timecount2++;if(timecount>=320)//PWM周期{PORTD

3、=0xff;//關(guān)timecount=0;}for(j=0;j<=7;j++){if(LED_code[j]<=timecount)//讀取占空

4、比值{PORTD&=~(1<

5、=0xff;TCCR0=0x01;TIMSK=0x01;cli();sei();//使能全局中while(1){}}/*第1個亮1/8,第2個亮2/8,第3個亮3/8,第4個亮4/8,第5個亮5/8,第6個亮6/8,第7個亮7/8,第8個全亮。*/#include#includevolatilesignedinttimecount=0;

6、volatilesignedlongtimecount2=0;unsignedintj=0;constintLED_code[]={280,240,200,160,120,80,40,0};SIGNAL(SIG_OVERFLOW0)//計數(shù)器溢出中斷{TCNT0=16;timecount++;timecount2++;if(timecount>=320)//PWM周期{PORTD

7、=0xff;timecount=0;}for(j=0;j<=7;j++)//依次比較讀取{if(LED_code[j

8、]<=timecount){PORTD&=~(1<

9、=0xff;TCCR0=0x01;TIMSK=0x01;cli();sei();//使能全局中while(1){}}/*所有的燈逐漸從暗到全亮，再由全亮到暗。*/#include#includevolatilesignedinttimecount=0;volatilesignedlongtimecount2=0;vola

10、tileunsignedcharadddir_FLAG=1;unsignedinti=0;SIGNAL(SIG_OVERFLOW0)//計數(shù)器溢出中斷{TCNT0=16;timecount++;timecount2++;if(timecount2>=2000)//每隔60毫秒更新下數(shù)組，即改變PWM的占空比{if(i<=0){adddir_FLAG=1;}if(i>=48){adddir_FLAG=0;}if(adddir_FLAG==1){i++;}if(adddir_FLAG==0){i--

11、;}timecount2=0;}if(timecount>=48)//PWM的周期{PORTD=0x00;//周期初始開timecount=0;}if(timecount>=i)//達(dá)到對應(yīng)調(diào)節(jié)到的占空比時{PORTD=0xff;//關(guān)}}intmain(void){DDRD=0xff;PORTD

12、=0xff;TCCR0=0x01;TIMSK=0x01;cli();sei();//使能全局中while(1){}}/*8個燈從第一個開始依次漸亮，直到最后一個。再從最后一個起漸暗，直到第一個。如此循

13、環(huán)往復(fù)。*/#include#includevolatilesignedinttimecount=0;volatilesignedlongtimecount2=0;unsignedinti=0;unsignedintj=0;unsignedintm=0;volatileunsignedcharadddir_FLAG=1;volatileintLED_code[]={0,-40,-80,-120,-160,-200,-240,-280};//每