mirror of https://github.com/jscrane/r65emu.git
68 lines
1.4 KiB
C++
68 lines
1.4 KiB
C++
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#include <Arduino.h>
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#include <hardware.h>
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#include "timed.h"
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#include "sound.h"
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#if defined(DAC_SOUND) && defined(ESP_PLATFORM)
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#include <driver/dac.h>
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static portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED;
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static dac_channel_t channel;
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static volatile const uint8_t *_bytes;
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static volatile unsigned _size, _off;
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static hw_timer_t *timer;
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void IRAM_ATTR timer_callback() {
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portENTER_CRITICAL_ISR(&mux);
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if (_off < _size)
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dac_output_voltage(channel, _bytes[_off++]);
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else {
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_bytes = 0;
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dac_output_disable(channel);
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timerAlarmDisable(timer);
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}
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portEXIT_CRITICAL_ISR(&mux);
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}
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void Sound::begin(unsigned pin, unsigned freq) {
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if (pin == 25)
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channel = DAC_CHANNEL_1;
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else if (pin == 26)
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channel = DAC_CHANNEL_2;
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timer = timerBegin(1, 80, true);
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timerAttachInterrupt(timer, &timer_callback, true);
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timerAlarmWrite(timer, 1000000 / freq, true);
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}
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const uint8_t *Sound::play(const uint8_t *bytes, unsigned size) {
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portENTER_CRITICAL_ISR(&mux);
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const uint8_t *play = (const uint8_t *)_bytes;
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if (_off == _size) {
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_bytes = bytes;
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_size = size;
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_off = 0;
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dac_output_enable(channel);
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timerAlarmEnable(timer);
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play = bytes;
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}
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portEXIT_CRITICAL_ISR(&mux);
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return play;
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}
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#else
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// does nothing by default
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void Sound::begin(unsigned channel, unsigned freq) {
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}
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const uint8_t *Sound::play(const uint8_t *bytes, unsigned size) {
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return 0;
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}
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#endif
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