dipl/code/textadv/include/dac.h

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/* 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