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i2sLoopback.ino
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i2sLoopback.ino
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#include <Arduino.h>
#include "ES8388.h"
#include "driver/i2s.h"
// ES8388 es8388(18, 23, 400000);
ES8388 es8388(33, 32, 400000);
uint32_t timeLapsed, ledTick;
uint8_t volume = 12;
uint16_t rxbuf[512];
i2s_config_t i2s_config = {
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_RX),
.sample_rate = 44100,
.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
.communication_format = I2S_COMM_FORMAT_I2S,
.intr_alloc_flags = 0,
.dma_buf_count = 8,
.dma_buf_len = 512,
.use_apll = false,
.tx_desc_auto_clear = true,
.fixed_mclk = 0};
// 18/23 version
// i2s_pin_config_t pin_config = {
// .bck_io_num = 5, .ws_io_num = 25, .data_out_num = 26, .data_in_num = 35};
// 33/32 version
i2s_pin_config_t pin_config = {
.bck_io_num = 27, .ws_io_num = 25, .data_out_num = 26, .data_in_num = 35};
size_t readsize = 0;
void setup() {
Serial.begin(115200);
pinMode(39, INPUT_PULLUP);
pinMode(5, INPUT_PULLUP);
pinMode(19, OUTPUT);
pinMode(22, OUTPUT);
Serial.println("Read Reg ES8388 : ");
if (!es8388.init()) Serial.println("Init Fail");
es8388.inputSelect(IN2);
es8388.setInputGain(8);
es8388.outputSelect(OUT2);
es8388.setOutputVolume(volume);
es8388.mixerSourceSelect(MIXIN2, MIXIN2);
es8388.mixerSourceControl(DACOUT);
bool pf = es8388.pub_write_reg(0x09, 0x00); // mutes onboard microphones (a bit) and highly reduces distortion
uint8_t *reg;
for (uint8_t i = 0; i < 53; i++) {
reg = es8388.readAllReg();
Serial.printf("Reg-%02d = 0x%02x\r\n", i, reg[i]);
}
// i2s
PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0_CLK_OUT1);
WRITE_PERI_REG(PIN_CTRL, 0xFFF0);
i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
i2s_set_pin(I2S_NUM_0, &pin_config);
i2s_set_sample_rates(I2S_NUM_0, 16000); // 16000 further reduces distortion, retaining acceptable quality
}
void loop() {
// read 512 samples (128 stereo samples)
i2s_read(I2S_NUM_0, &rxbuf[0], 512 * 2, &readsize, 1000);
// play buffer
i2s_write(I2S_NUM_0, &rxbuf[0], 512 * 2, &readsize, 1000);
}