pentabug/firmware/lib/synth.h

#ifndef SYNTH_H
#define SYNTH_H

#define SYNTH_BUFSIZE (16)
#define SYNTH_BUFMASK (0b00001111)

enum {
	WAVE_OFF, WAVE_PULSE, WAVE_SAW, WAVE_NOISE
};

typedef struct {
	uint8_t note;
	uint8_t inst_nr;
	uint8_t pos;

	uint16_t phase;
	uint16_t pulse_width;

	uint8_t level; // envelop level

} synth_channel_t;

typedef struct {
	uint16_t pulse_width;
	uint8_t pulse_sweep;
	uint8_t wave_table_pos;
	uint8_t decay;

} synth_instrument_t;

void synth_init(void);
void synth_poll(void);

#endif