C++ (Cpp) note_to_divisor Exemples

Exemple #1

Fichier : tone_alarm.cpp Projet : elikos/Firmware

void
ToneAlarm::start_note(unsigned note)
{
	// check if circuit breaker is enabled
	if (_cbrk == CBRK_UNINIT) {
		_cbrk = circuit_breaker_enabled("CBRK_BUZZER", CBRK_BUZZER_KEY);
	}

	if (_cbrk != CBRK_OFF) { return; }

	// compute the divisor
	unsigned divisor = note_to_divisor(note);

	// pick the lowest prescaler value that we can use
	// (note that the effective prescale value is 1 greater)
	unsigned prescale = divisor / 65536;

	// calculate the timer period for the selected prescaler value
	unsigned period = (divisor / (prescale + 1)) - 1;
#if TONE_ALARM_NOT_DONE
	rPSC = prescale;	// load new prescaler
	rARR = period;		// load new toggle period
	rEGR = GTIM_EGR_UG;	// force a reload of the period
	rCCER |= TONE_CCER;	// enable the output
#else
	prescale++;
	period++;
#endif
	// configure the GPIO to enable timer output
	sam_configgpio(GPIO_TONE_ALARM);
}

Exemple #2

Fichier : tone_alarm.cpp Projet : harvard-uas/Firmware

void
ToneAlarm::start_note(unsigned note)
{
	// compute the divisor
	unsigned divisor = note_to_divisor(note);

	// pick the lowest prescaler value that we can use
	// (note that the effective prescale value is 1 greater)
	unsigned prescale = divisor / 65536;

	// calculate the timer period for the selected prescaler value
	unsigned period = (divisor / (prescale + 1)) - 1;

	rPSC = prescale;	// load new prescaler
	rARR = period;		// load new toggle period
	rEGR = GTIM_EGR_UG;	// force a reload of the period
	rCCER |= TONE_CCER;	// enable the output

	// configure the GPIO to enable timer output
	stm32_configgpio(GPIO_TONE_ALARM);
}