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analogWrite with negative value to delete pwm objects #105

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analogWrite with negative value to delete pwm objects #105

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14 changes: 11 additions & 3 deletions cores/arduino/wiring_analog.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -45,14 +45,22 @@ void analogWrite(pin_size_t pin, int val)
if (pin >= PINS_COUNT) {
return;
}
float percent = (float)val/(float)((1 << write_resolution)-1);
mbed::PwmOut* pwm = digitalPinToPwm(pin);
if (pwm == NULL) {
if ((pwm == NULL) && (val > 0)) {
pwm = new mbed::PwmOut(digitalPinToPinName(pin));
digitalPinToPwm(pin) = pwm;
pwm->period_ms(2); //500Hz
float percent = (float)val/(float)((1 << write_resolution)-1);
pwm->write(percent);
}
else if ((pwm != NULL) && (val < 0)) {
delete pwm;
digitalPinToPwm(pin) = NULL;
}
else if ((pwm != NULL) && (val > 0)) {
float percent = (float)val/(float)((1 << write_resolution)-1);
pwm->write(percent);
}
pwm->write(percent);
}

void analogWriteResolution(int bits)
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