I2S Pin Setup Causing Network/DNS Issues on ESP32-S3

[TheSquad]

Hi all,

I’m working on an audio streaming project using an ESP32-S3 and have encountered an odd issue. When I configure the I2S pins using the ESP-IDF API, subsequent network operations (like DNS resolution) fail.

Issue Description:
• After calling i2s_set_pin(), DNS lookups such as WiFi.hostByName("google.com", ip) return errors (e.g., DNS Failed, IP Address: 0.0.0.0).
• If I perform DNS queries before calling i2s_set_pin(), everything works as expected.

Relevant Code Snippet:

Code: Select all

// Installing I2S driver and setting pins
esp_err_t 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);
}

Full I2S Setup Function:

Code: Select all

void setup_i2s() {
    i2s_config_t i2s_config = {
        .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_TX),
        .sample_rate = SAMPLE_RATE,
        .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
        .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
        .communication_format = I2S_COMM_FORMAT_STAND_I2S,
        .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
        .dma_buf_count = 4,
        .dma_buf_len = BUFFER_SIZE,
        .use_apll = false,
        .tx_desc_auto_clear = true,
        .fixed_mclk = 0
    };

    i2s_pin_config_t pin_config = {
        .bck_io_num = I2S_BCK,
        .ws_io_num = I2S_LRC,
        .data_out_num = I2S_DOUT,
        .data_in_num = MIC_I2S_DIN
    };

    // Install the I2S driver.
    esp_err_t err = i2s_driver_install(I2S_PORT, &i2s_config, 0, NULL);
    if (err != ESP_OK) {
        Serial.printf("Failed installing driver: %d\n", err);
        while (true);
    }

    // Set the I2S pins.
    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 driver installed.");
}

PlatformIO Configuration (platformio.ini):

Code: Select all

[env:esp32S3dev]
platform = platformio/espressif32@^6.1.0
board = esp32-s3-devkitm-1
board_build.extra_flags = 
    -DI2S_BCK=39
    -DI2S_LRC=38
    -DMIC_I2S_DIN=35
    -DI2S_DOUT=36
    -DDISPLAY_ON=true
    -DI2C_SDA=47
    -DI2C_SCL=48
    -DTALK_PIN=18

Summary:
The problem appears to be that once i2s_set_pin() is called, the network stack stops resolving DNS queries properly, or having network issues alltogether. I’m curious if anyone has encountered a similar conflict or has insights into why configuring the I2S pins might affect network functionality on the ESP32-S3.

Any help or suggestions would be greatly appreciated. Thanks in advance!

P.S : I have tried the same code on ESP32 (non S3) and it seems to work fine

[lbernstone]

Can you try with a recent version?

Code: Select all

platform = https://github.com/pioarduino/platform-espressif32/releases/download/stable/platform-espressif32.zip