/* Copyright © 2020 tyrolyean
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _DAC_H
#define _DAC_H

#include <stdint.h>

void write_to_dac(uint8_t addr, uint8_t data);
uint8_t read_from_dac(uint8_t addr);

/* The operation modes of the dac used for generation of different tones */
#define DAC_MODE_SILENT      0
#define DAC_MODE_SINE        1
#define DAC_MODE_SQUARE      2
#define DAC_MODE_SAW         3
#define DAC_MODE_NOISE       4
#define DAC_MODE_TRIANGLE    5

extern uint8_t dac_mode;
/* This variable is used to deviate the frequency from the baseline frequency
 * of around 1kHz. If this integer is positive it makes the produced waveform
 * longer, if it is negative the produced waveform becomes less sharp, but the
 * frequency goes up. 0 is the baseline */
extern int16_t dac_frequency_deviation;

void feed_dac();
void routine_dac();

void update_sound();

#endif