45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/* Copyright © 2020 tyrolyean
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _DAC_H
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#define _DAC_H
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#include <stdint.h>
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void write_to_dac(uint8_t addr, uint8_t data);
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uint8_t read_from_dac(uint8_t addr);
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/* The operation modes of the dac used for generation of different tones */
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#define DAC_MODE_SILENT 0
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#define DAC_MODE_SINE 1
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#define DAC_MODE_SQUARE 2
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#define DAC_MODE_SAW 3
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#define DAC_MODE_NOISE 4
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#define DAC_MODE_TRIANGLE 5
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extern uint8_t dac_mode;
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/* This variable is used to deviate the frequency from the baseline frequency
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* of around 1kHz. If this integer is positive it makes the produced waveform
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* longer, if it is negative the produced waveform becomes less sharp, but the
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* frequency goes up. 0 is the baseline */
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extern int16_t dac_frequency_deviation;
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void feed_dac();
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void routine_dac();
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void update_sound();
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#endif
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