analogWrite()函数源码.doc

《analogWrite()函数源码.doc》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、voidanalogWrite(uint8_tpin,intval){if(digitalPinToTimer(pin)==TIMER1A){//connectpwmtopinontimer1,channelAsbi(TCCR1A,COM1A1);//setpwmdutyOCR1A=val;}elseif(digitalPinToTimer(pin)==TIMER1B){//connectpwmtopinontimer1,channelBsbi(TCCR1A,COM1B1);//setpwmdutyOCR1B=val;}elseif(digitalPinToTimer(pin

2、)==TIMER0A){if(val==0){digitalWrite(pin,LOW);}else{//connectpwmtopinontimer0,channelAsbi(TCCR0A,COM0A1);//setpwmdutyOCR0A=val;}}elseif(digitalPinToTimer(pin)==TIMER0B){if(val==0){digitalWrite(pin,LOW);}else{//connectpwmtopinontimer0,channelBsbi(TCCR0A,COM0B1);//setpwmdutyOCR0B=val;}}elseif(

3、digitalPinToTimer(pin)==TIMER2A){//connectpwmtopinontimer2,channelAsbi(TCCR2A,COM2A1);//setpwmdutyOCR2A=val;}elseif(digitalPinToTimer(pin)==TIMER2B){//connectpwmtopinontimer2,channelBsbi(TCCR2A,COM2B1);//setpwmdutyOCR2B=val;}elseif(val<128)digitalWrite(pin,LOW);elsedigitalWrite(pin,HIGH);}