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esp32:wm8782 [2021/05/17 22:53] – aistisesp32:wm8782 [2021/05/18 12:33] (current) – aistis
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 some code that helped: https://www.esp32.com/viewtopic.php?t=3658 some code that helped: https://www.esp32.com/viewtopic.php?t=3658
 +
 +<code cpp>
 +#include <driver/i2s.h>
 +
 +const i2s_port_t I2S_PORT = I2S_NUM_0;
 +
 +#include "driver/mcpwm.h"
 +
 +void setup() {
 +  Serial.begin(115200);
 +
 +  Serial.println("Configuring I2S...");
 +  esp_err_t err;
 +
 +  int SAMPLE_RATE = 8000; //44100; //16000; //44100; //44100; // 100000; //176400; //96000; //96000;
 +
 +  const i2s_config_t i2s_config = {
 +    .mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX), // Receive, not transfer
 +    //.mode = i2s_mode_t(I2S_MODE_SLAVE | I2S_MODE_RX), // Receive, not transfer
 +    .sample_rate =   44100, // 48000,   44100, //                      // 16KHz
 +    .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT, // could only get it to work with 32bits
 +    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
 +//    .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT, // 2-channels
 +    .communication_format = (i2s_comm_format_t)(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB),
 +    .intr_alloc_flags = 0,
 +    .dma_buf_count = 16,
 +    .dma_buf_len = 256
 +  };
 +
 +  const i2s_pin_config_t pin_config = {
 +    .bck_io_num = 14,   // BCKL  SCK BCLK
 +    .ws_io_num = 15,    // LRCL LRCLK  FS
 +    .data_out_num = -1, // not used (only for speakers)
 +    .data_in_num = 32   // DOUT SD SDATA, SDIN, SDOUT, DACDAT, ADCDAT
 +  };
 +
 +  // Configuring the I2S driver and pins.
 +  // This function must be called before any I2S driver read/write operations.
 +  err = i2s_driver_install(I2S_PORT, &i2s_config, 0, NULL);
 +  if (err != ESP_OK) {
 +    Serial.printf("Failed installing driver: %d\n", err);
 +    while (true);
 +  }
 +  err = i2s_set_pin(I2S_PORT, &pin_config);
 +  if (err != ESP_OK) {
 +    Serial.printf("Failed setting pin: %d\n", err);
 +    while (true);
 +  }
 +  Serial.println("I2S driver0 installed.");
 +
 +//  PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0_CLK_OUT1);
 +//  WRITE_PERI_REG(PIN_CTRL, READ_PERI_REG(PIN_CTRL) & 0xFFFFFFF0);
 +
 +  REG_WRITE(PIN_CTRL, 0b111111110000);
 +  PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0_CLK_OUT1);
 +  //https://esp32.com/viewtopic.php?f=5&t=1585&start=10
 +
 +  //  mcpwm_gpio_init(MCPWM_UNIT_0, MCPWM0A, I2S_MCLK);
 +  //  mcpwm_pin_config_t pin_config = {
 +  //    .mcpwm0a_out_num = I2S_MCLK
 +  //  };
 +  //  mcpwm_set_pin(MCPWM_UNIT_0, &pin_config);
 +  //  gpio_pulldown_en(I2S_MCLK);
 +  //  mcpwm_config_t pwm_config;
 +  //  pwm_config.frequency = (SAMPLE_RATE) * 256; //when frequency is too high (actually only 1MHZ)there is no signal
 +  //  pwm_config.cmpr_a = 50.0;
 +  //  pwm_config.cmpr_b = 50.0;
 +  //  pwm_config.counter_mode = MCPWM_UP_COUNTER;
 +  //  pwm_config.duty_mode = MCPWM_DUTY_MODE_0;
 +  //  mcpwm_init(MCPWM_UNIT_0, MCPWM_TIMER_0, &pwm_config);
 +}
 +
 +#include <iostream>
 +#include <algorithm>
 +#include <array>
 +
 +const int numCommunicationData = 256; //256; //1400;
 +unsigned char communicationData[numCommunicationData];
 +void loop() {
 +  int num_bytes_read = i2s_read_bytes(I2S_NUM_0, (char *) communicationData, numCommunicationData, portMAX_DELAY);
 +  //  auto maxv = *std::max_element((int32_t*)communicationData, (int32_t*)communicationData + 255 / 4);
 +  //  auto minv = *std::max_element((int32_t*)communicationData, (int32_t*)communicationData + 255 / 4);
 +  //  Serial.printf("%d, %d, %d\n", num_bytes_read, minv, maxv);
 +
 +  auto v1 = *((int32_t*)communicationData + 0);
 +  auto v2 = *((int32_t*)communicationData + 1);
 +  Serial.printf("%d, %d, %d\n", num_bytes_read, v1, v2);
 +}
 +</code>
 +
  
 simmilar board simmilar board
  
 {{:esp32:pasted:20210517-215550.png}} {{:esp32:pasted:20210517-215550.png}}
esp32/wm8782.1621281214.txt.gz · Last modified: by aistis