esp32s3 idf读取sd卡音频文件通过i2s输出的详细程序

以下是ESP32-S3 IDF读取SD卡音频文件通过I2S输出的详细程序：

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_spi_flash.h"
#include "driver/i2s.h"
#include "driver/sdmmc_host.h"
#include "driver/sdspi_host.h"
#include "esp_vfs_fat.h"

#define I2S_NUM 0 // I2S port number
#define I2S_SAMPLE_RATE 44100 // Sample rate of the audio file
#define I2S_SAMPLE_BITS 16 // Sample size of the audio file
#define I2S_BUF_SIZE 1024 // I2S buffer size
#define I2S_READ_SIZE 512 // Size of each I2S read
#define SD_CS_PIN 15 // Chip select pin for the SD card

void i2s_task(void *pvParameters)
{
    FILE *file = fopen("/sdcard/test.wav", "r");
    if (file == NULL) {
        printf("Failed to open file\n");
        vTaskDelete(NULL);
    }

    // Configure I2S
    i2s_config_t i2s_config = {
        .mode = I2S_MODE_MASTER | I2S_MODE_TX,
        .sample_rate = I2S_SAMPLE_RATE,
        .bits_per_sample = I2S_SAMPLE_BITS,
        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
        .communication_format = I2S_COMM_FORMAT_I2S,
        .dma_buf_count = 4,
        .dma_buf_len = I2S_BUF_SIZE,
        .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1
    };
    i2s_pin_config_t pin_config = {
        .bck_io_num = 26,
        .ws_io_num = 25,
        .data_out_num = 22,
        .data_in_num = I2S_PIN_NO_CHANGE
    };
    i2s_driver_install(I2S_NUM, &i2s_config, 0, NULL);
    i2s_set_pin(I2S_NUM, &pin_config);
    i2s_zero_dma_buffer(I2S_NUM);

    // Allocate buffer for I2S data
    char *i2s_data = malloc(I2S_READ_SIZE);

    while (1) {
        // Read data from file
        int bytes_read = fread(i2s_data, 1, I2S_READ_SIZE, file);

        // End of file
        if (bytes_read == 0) {
            break;
        }

        // Write data to I2S buffer
        i2s_write_bytes(I2S_NUM, i2s_data, bytes_read, portMAX_DELAY);
    }

    // Cleanup
    free(i2s_data);
    fclose(file);
    i2s_driver_uninstall(I2S_NUM);
    vTaskDelete(NULL);
}

void sd_task(void *pvParameters)
{
    // Initialize SD card
    sdmmc_host_t host = SDSPI_HOST_DEFAULT();
    sdspi_slot_config_t slot_config = SDSPI_SLOT_CONFIG_DEFAULT();
    slot_config.gpio_miso = 19;
    slot_config.gpio_mosi = 23;
    slot_config.gpio_sck = 18;
    slot_config.gpio_cs = SD_CS_PIN;
    esp_vfs_fat_sdmmc_mount_config_t mount_config = {
        .format_if_mount_failed = false,
        .max_files = 5
    };
    sdmmc_card_t *card;
    esp_err_t ret = esp_vfs_fat_sdspi_mount("/sdcard", &host, &slot_config, &mount_config, &card);
    if (ret != ESP_OK) {
        printf("Failed to mount SD card\n");
        vTaskDelete(NULL);
    }

    // Start I2S task
    xTaskCreate(i2s_task, "i2s_task", 2048, NULL, 5, NULL);

    vTaskDelete(NULL);
}

void app_main()
{
    // Start SD task
    xTaskCreate(sd_task, "sd_task", 2048, NULL, 5, NULL);
}

这个程序使用ESP32-S3的I2S和SD卡接口来读取音频文件并输出到I2S。在程序中，我们首先打开SD卡并挂载文件系统，然后启动I2S任务。I2S任务从文件中读取数据并将其写入I2S缓冲区。需要注意的是，I2S的配置和音频文件的格式必须匹配。

在使用此程序之前，请确保已将适当的SD卡和I2S电路连接到ESP32-S3开发板上，并将音频文件命名为“test.wav”并存储在SD卡根目录下。