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added zero duty cycle pwm feature

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This commit is contained in:
Tristan Krause 2019-12-03 07:41:20 +01:00
parent f7f2c5137b
commit bc459c80ce
1 changed files with 10 additions and 3 deletions
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13
firmware/pwm.cpp
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@ -5,8 +5,8 @@ const uint8_t PWM::PRESCALER_COUNT = sizeof(PRESCALERS) / sizeof(uint16_t);
void PWM::init() const volatile void PWM::init() const volatile
{ {
// fast pwm mode, top = OCR0A, non inverting mode // fast pwm mode, top = OCR0A, non inverting mode
TCCR0A = _BV(COM0B1) | _BV(WGM00) | _BV(WGM01); TCCR0A = _BV(WGM00) | _BV(WGM01);
TCCR0B = _BV(WGM02); TCCR0B = _BV(WGM02);
// output signal on PB4 // output signal on PB4
DDRB |= _BV(PB4); DDRB |= _BV(PB4);
@ -23,7 +23,14 @@ void PWM::setFrequency(uint32_t freq) const volatile
void PWM::setValue(uint8_t value) const volatile void PWM::setValue(uint8_t value) const volatile
{ {
OCR0B = value; if(value)
{
OCR0B = value;
TCCR0A |= _BV(COM0B1);
} else
{
TCCR0A &= ~_BV(COM0B1);
}
} }
uint8_t PWM::getTop() const volatile uint8_t PWM::getTop() const volatile