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在http://www.geek-workshop.com/for ... D%BA%E2%D0%A1%B3%B5这个前辈的帖子里面我有些疑惑,有人看过这位前辈的帖子吗?能给我解释下下面这段代码吗?
void SetMotorVoltage(int nLeftVol, int nRightVol) {
if(nLeftVol >=0)
{ digitalWrite(M_left,LOW);
digitalWrite(M_left2,HIGH);
} else {
digitalWrite(M_left,HIGH);
digitalWrite(M_left2,LOW);
nLeftVol=-nLeftVol;
}
if(nRightVol >= 0) {
digitalWrite(M_right,LOW);
digitalWrite(M_right2,HIGH);
} else {
digitalWrite(M_right,HIGH);
digitalWrite(M_right2,LOW);
nRightVol=-nRightVol;
}
if(nLeftVol>255) { nLeftVol = 255 ; } //防止PWM值超过255
if(nRightVol>255) { nRightVol = 255 ; }//防止PWM值超过255
analogWrite(E_left,nLeftVol);
analogWrite(E_right,nRightVol);
}
能给我解释下这段代码吗?特别是 nRightVol=-nRightVol;这里?
麻烦您们了 |
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