88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
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#ifndef AudioInI2S_H
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#define AudioInI2S_H
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#include "Arduino.h"
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#include <driver/i2s.h>
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class AudioInI2S
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{
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public:
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AudioInI2S(int bck_pin, int ws_pin, int data_pin, int channel_pin = -1, i2s_channel_fmt_t channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT);
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void read(int32_t _samples[]);
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void begin(int sample_size, int sample_rate = 44100, i2s_port_t i2s_port_number = I2S_NUM_0);
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private:
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int _bck_pin;
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int _ws_pin;
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int _data_pin;
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int _channel_pin;
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i2s_channel_fmt_t _channel_format;
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int _sample_size;
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int _sample_rate;
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i2s_port_t _i2s_port_number;
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i2s_config_t _i2s_config = {
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.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
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.sample_rate = 0, // set in begin()
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.bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
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.channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT,
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.communication_format = I2S_COMM_FORMAT_I2S,
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.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
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.dma_buf_count = 4,
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.dma_buf_len = 0, // set in begin()
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.use_apll = false,
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.tx_desc_auto_clear = false,
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.fixed_mclk = 0};
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i2s_pin_config_t _i2s_mic_pins = {
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.bck_io_num = I2S_PIN_NO_CHANGE, // set in begin()
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.ws_io_num = I2S_PIN_NO_CHANGE, // set in begin()
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.data_out_num = I2S_PIN_NO_CHANGE,
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.data_in_num = I2S_PIN_NO_CHANGE // set in begin()
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};
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};
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AudioInI2S::AudioInI2S(int bck_pin, int ws_pin, int data_pin, int channel_pin, i2s_channel_fmt_t channel_format)
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{
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_bck_pin = bck_pin;
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_ws_pin = ws_pin;
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_data_pin = data_pin;
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_channel_pin = channel_pin;
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_channel_format = channel_format;
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}
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void AudioInI2S::begin(int sample_size, int sample_rate, i2s_port_t i2s_port_number)
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{
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if (_channel_pin >= 0)
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{
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pinMode(_channel_pin, OUTPUT);
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digitalWrite(_channel_pin, _channel_format == I2S_CHANNEL_FMT_ONLY_RIGHT ? LOW : HIGH);
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}
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_sample_rate = sample_rate;
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_sample_size = sample_size;
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_i2s_port_number = i2s_port_number;
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_i2s_mic_pins.bck_io_num = _bck_pin;
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_i2s_mic_pins.ws_io_num = _ws_pin;
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_i2s_mic_pins.data_in_num = _data_pin;
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_i2s_config.sample_rate = _sample_rate;
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_i2s_config.dma_buf_len = _sample_size;
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_i2s_config.channel_format = _channel_format;
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// start up the I2S peripheral
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i2s_driver_install(_i2s_port_number, &_i2s_config, 0, NULL);
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i2s_set_pin(_i2s_port_number, &_i2s_mic_pins);
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}
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void AudioInI2S::read(int32_t _samples[])
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{
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// read I2S stream data into the samples buffer
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size_t bytes_read = 0;
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i2s_read(_i2s_port_number, _samples, sizeof(int32_t) * _sample_size, &bytes_read, portMAX_DELAY);
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int samples_read = bytes_read / sizeof(int32_t);
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}
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#endif // AudioInI2S_H
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