mirror of https://github.com/jscrane/r65emu.git
68 lines
1.2 KiB
C++
68 lines
1.2 KiB
C++
#include <Arduino.h>
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#include <hardware.h>
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#include "timed.h"
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#include "sound_dac.h"
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#if defined(DAC_SOUND) && defined(ESP_PLATFORM)
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static DAC *s;
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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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void IRAM_ATTR timer_callback() {
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s->on_tick();
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}
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void IRAM_ATTR DAC::on_tick() {
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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 if (_bytes) {
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_bytes = 0;
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dac_output_disable(channel);
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}
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portEXIT_CRITICAL_ISR(&mux);
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}
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void DAC::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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s = this;
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timer_create(freq, &timer_callback);
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}
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const uint8_t *DAC::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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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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#pragma message "No DAC"
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// does nothing by default
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void DAC::begin(unsigned channel, unsigned freq) {
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}
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const uint8_t *DAC::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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