I2S mic not working since 4.4 (IDFGH-8138)

[MikeBailleul]

Answers checklist.

• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

v4.4

Operating System used.

macOS

How did you build your project?

VS Code IDE

If you are using Windows, please specify command line type.

No response

Development Kit.

ESP32 Dev Module

Power Supply used.

USB

What is the expected behavior?

Using this sketch: https://github.com/atomic14/esp32-i2s-mic-test/blob/main/i2s_mic_test/i2s_mic_test.ino
With a INMP441 configured as follow:
WS -> 25
SCK -> 32
SD -> 33
L/R -> GND
GND -> GND
VDD -> 3.3V

It should output values of the sound received by the mic.

What is the actual behavior?

Only 0 values

Steps to reproduce.

I originally submitted an issue here: espressif/arduino-esp32#7177
But I was redirected to esp-idf since it appears to be related to it.

A brief summary:

In platformio.ini, this does NOT work because it is using the latest release of arduino-esp32

platform = espressif32

By changing it to this, it works as intended

platform = espressif32@5.0.0

Later we discovered this commit in arduino-esp32 repo is where it stops to work normally

platform = espressif32
platform_packages = framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#666c66d3d1c7437aaebaaadf2084927b7fc476c4

Debug Logs.

No response

More Information.

No response

[happychriss]

Thanks for raising this, I am having the same issue - also with Tasmota image: It seems to have stopped between 4.4.0 and 4.4.3

Working: platform = https://github.com/tasmota/platform-espressif32/releases/download/v2.0.2.3/platform-espressif32-2.0.2.3.zip
framework-espidf @ 3.40400.0 (4.4.0)

Not workingt: platform = https://github.com/tasmota/platform-espressif32
framework-espidf @ 3.40403.0 (4.4.3)

I am using the following I2S Config:
` i2s_config_t i2s_config_micro = {
.mode = (i2s_mode_t) (I2S_MODE_MASTER | I2S_MODE_RX),
.sample_rate = 16000,

        //  The data word size is set at 32 bits and "I2S_PHILIPS_MODE" format. So a single stereo frame consists of two 32-bit PCM words or 8 bytes.
        //  The actual PCM audio data is 24 bits wide, is signed and is stored in little-endian format with 8 bits of left-justified 0 "padding".
        .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,

        .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT, // was I2S_CHANNEL_FMT_RIGHT_LEFT
        .communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_I2S),
        .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
        .dma_buf_count = 4,
        .dma_buf_len = 1024,
        .use_apll = false,
        .tx_desc_auto_clear = false,
        .fixed_mclk = 0
};`

[L-KAYA]

I've tried on the latest release/v4.4 branch, it works well now, this bug(only_lefthas no sound) should has already been fixed in commit 56a89b920dcf47c7c1d34cbd00ff745ffd7b3246.

[MikeBailleul]

How do I test for a specific commit of the IDF?
Is this the right way in platform.ini?

platform = espressif32
platform_packages = framework-espidf @ https://github.com/espressif/esp-idf.git#56a89b920dcf47c7c1d34cbd00ff745ffd7b3246

If yes, it does not work for me. I receive only NaN values from the mic.

[L-KAYA]

Maybe you can try release/v4.4 branch directly instead of a specific commit, hope it can work

platform_packages = framework-espidf @ https://github.com/espressif/esp-idf/tree/release/v4.4

[MikeBailleul]

I believe you meant this?

platform_packages = framework-espidf @ https://github.com/espressif/esp-idf.git#release/v4.4

because your suggestion was not building.

And, still no luck: NaN values.

[L-KAYA]

I ran that example directly on IDF release/v4.4 and modified slightly to make it build:

#include <stdio.h>
#include "driver/i2s.h"

// you shouldn't need to change these settings
#define SAMPLE_BUFFER_SIZE 512
#define SAMPLE_RATE 8000
// most microphones will probably default to left channel but you may need to tie the L/R pin low
#define I2S_MIC_CHANNEL I2S_CHANNEL_FMT_ONLY_LEFT
// either wire your microphone to the same pins or change these to match your wiring
#define I2S_MIC_SERIAL_CLOCK GPIO_NUM_32
#define I2S_MIC_LEFT_RIGHT_CLOCK GPIO_NUM_25
#define I2S_MIC_SERIAL_DATA GPIO_NUM_33

// don't mess around with this
i2s_config_t i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
    .sample_rate = SAMPLE_RATE,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
    .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 = 1024,
    .use_apll = false,
    .tx_desc_auto_clear = false,
    .fixed_mclk = 0
};

// and don't mess around with this
i2s_pin_config_t i2s_mic_pins = {
    .bck_io_num = I2S_MIC_SERIAL_CLOCK,
    .ws_io_num = I2S_MIC_LEFT_RIGHT_CLOCK,
    .data_out_num = I2S_PIN_NO_CHANGE,
    .data_in_num = I2S_MIC_SERIAL_DATA
};

void setup(void)
{
    // start up the I2S peripheral
    i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
    i2s_set_pin(I2S_NUM_0, &i2s_mic_pins);
}

int32_t raw_samples[SAMPLE_BUFFER_SIZE] = {0};

void loop(void)
{
    // read from the I2S device
    size_t bytes_read = 0;
    i2s_read(I2S_NUM_0, raw_samples, sizeof(int32_t) * SAMPLE_BUFFER_SIZE, &bytes_read, portMAX_DELAY);
    int samples_read = bytes_read / sizeof(int32_t);
    // dump the samples out to the serial channel.
    for (int i = 0; i < samples_read; i++) {
        printf("%d ", raw_samples[i]);
    }
    printf("\n");
}

void app_main(void)
{
    setup();
    while (1) {
        loop();
        vTaskDelay(pdMS_TO_TICKS(500));
    }
}

The code ran as expected for me, maybe you can take a try as well. If it works, we can just waiting for the release of v4.4.3

[MikeBailleul]

I tried your sample code, it does not work with my INMP441 mic.

[L-KAYA]

Have you tried to use I2S_CHANNEL_FMT_RIGHT_LEFT or I2S_CHANNEL_FMT_ONLY_RIGHT

[MikeBailleul]

Interesting, I2S_CHANNEL_FMT_ONLY_RIGHT worked! I2S_CHANNEL_FMT_RIGHT_LEFT did not.
Why is that tough?