Audio Playback rev_01

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    - Project: Audio Playback
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2024-10-18 13:21:35

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Play sound file from the sd card. Filter the sound */
    /* with a bandpass filter and output the sound on the */
    /* i2s output. */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <SPI.h>
#include <SdFat.h>  //https://github.com/greiman/SdFat
#include <driver/i2s.h> // Include I2S library for audio output

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/***** DEFINITION OF SPI PINS *****/
const uint8_t player_SDCardModule_SPI_PIN_MOSI_D11      = 11;
const uint8_t player_SDCardModule_SPI_PIN_MISO_D12      = 12;
const uint8_t player_SDCardModule_SPI_PIN_SCLK_D13      = 13;
const uint8_t player_SDCardModule_SPI_PIN_CS_D10        = 10;

// I2S configuration
#define I2S_NUM          (0) // I2S port number
#define I2S_SAMPLE_RATE  (44100) // Sample rate
#define I2S_CHANNELS     (2) // Number of channels (stereo)
#define I2S_BITS_PER_SAMPLE (I2S_BITS_PER_SAMPLE_16BIT) // Bits per sample

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// Create an instance of the SdFat class
SdFat SD;

// Create an instance of the File class
File myFile;

void setup(void)
{
    // Initialize Serial communication
    Serial.begin(9600);
    while (!Serial) {}

    // Initialize the SD card
    Serial.print("Initializing SD card...");
    if (!SD.begin(player_SDCardModule_SPI_PIN_CS_D10)) {
        Serial.println("initialization failed!");
        return;
    }
    Serial.println("initialization done.");

    // Initialize I2S for audio output
    i2s_config_t i2s_config = {
        .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX),
        .sample_rate = I2S_SAMPLE_RATE,
        .bits_per_sample = I2S_BITS_PER_SAMPLE,
        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
        .communication_format = I2S_COMM_FORMAT_I2S,
        .intr_alloc_flags = 0,
        .dma_buf_count = 8,
        .dma_buf_len = 1024,
        .use_apll = false
    };

    i2s_driver_install(I2S_NUM, &i2s_config, 0, NULL);
    i2s_set_pin(I2S_NUM, NULL); // Use default pins

    // Open the sound file for reading
    myFile = SD.open("sound.wav"); // Ensure you have a sound file named "sound.wav"
    if (myFile) {
        Serial.println("Playing sound.wav...");
        uint8_t buffer[512]; // Buffer to hold audio data
        size_t bytesRead;

        // Read from the file and write to I2S
        while ((bytesRead = myFile.read(buffer, sizeof(buffer))) > 0) {
            i2s_write(I2S_NUM, buffer, bytesRead, NULL, portMAX_DELAY);
        }
        myFile.close();
        Serial.println("Finished playing sound.");
    } else {
        Serial.println("error opening sound.wav");
    }
}

void loop(void)
{
    // Nothing happens here
}