#include <hardware/pwm.h>
#include <pico/types.h>

#include "const.h"
#include "synth.h"

#include "pwm.h"

void pwm_isr(void) {
	static uint slice = -1, chan = -1;
	if (slice == -1) slice = pwm_gpio_to_slice_num(AUDIO_OUT);
	if (chan == -1) chan = pwm_gpio_to_channel(AUDIO_OUT);

	pwm_clear_irq(slice);

	// TODO:
	float sample = get_sample();

	uint16_t level = (uint16_t)((sample + 1.0f) * 0.5f * 3400.0f);
	pwm_set_chan_level(slice, chan, level);
}