SPH0645 i2s microphone issue when migrate from legacy esp-idf version (IDFGH-5453)

[konradkoperek]

Environment

• Module or chip used: [ESP32-WROOM-32]
• IDF version: v4.2

• Problem Description

Hello, I'm migrating code from esp-idf v3.2 to version v4.2. I'm using SPH0645 i2s microphone to read sound data. When I was migrate code to the new idf, values which comes from microphone are 0. I run prevoius version of code which base on old idf and data are properly so it isn't hardware issue. I2s init function and reading data are same in this two projects:

#define LEN_WHOLE_BUFF            4096
#define LOW_FREQUENCY             51
#define HIGH_FREQUENCY            (( LEN_WHOLE_BUFF / 2 ) - 1 )

void i2sInit()
{
    i2s_config_t i2s_config = {
       .mode = I2S_MODE_MASTER | I2S_MODE_RX,
       .sample_rate = LEN_WHOLE_BUFF,
       .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
       .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
       .communication_format = (i2s_comm_format_t)(I2S_COMM_FORMAT_PCM | I2S_COMM_FORMAT_I2S_LSB ),
       .dma_buf_count = 3,
       .dma_buf_len =  512,
       .use_apll = 1,
       .intr_alloc_flags = ESP_INTR_FLAG_LEVEL3
    };
    i2s_pin_config_t pin_config =
    {
       .ws_io_num =MIC_WS, //PDM clock
       .data_in_num = MIC_DATA_IN, //PDM data
       .bck_io_num = MIC_BCK,
       .data_out_num = -1,
    };
    i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
    i2s_set_pin(I2S_NUM_0, &pin_config);
}

//static void i2s_mesaurement( int * buff , int nos)
//{
//  size_t val = 0;
//  i2s_read(I2S_NUM_0 , buff, sizeof( int ) * nos, &val, portMAX_DELAY);
//}

void i2s_mesaurement( void * buff , int nos)
{
    size_t val = 0;
    i2s_read(I2S_NUM_0 , buff, 4 * nos, &val, portMAX_DELAY);
}

I saw one post which suggest that SPH0645 are incompatimble with timings in new idf. Could you confirm if it is issues with drivers in new idf? It is possibility to fix it ?

[seanw214]

Try to set .communication_format to I2S_COMM_FORMAT_STAND_I2S and call i2s_set_clk() after i2s_set_pin(). These changes worked for me.

[PaulAnurag]

Hi @seanw214

I am trying to run the example for SPH0645LM4H mic which is not a PDM Mic.

IDF Version 4.4

Can anyone help me with the configurations. I am unable to read data. The configurations that I have set are:

// Set the I2S configuration as PDM and 16bits per sample
i2s_config_t i2s_config = {
    .mode = I2S_MODE_MASTER | I2S_MODE_RX,
    .sample_rate = CONFIG_EXAMPLE_SAMPLE_RATE,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_24BIT,
    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
    .communication_format = I2S_COMM_FORMAT_STAND_I2S,
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL2,
    .dma_buf_count = 8,
    .dma_buf_len = 200,
    .use_apll = 0,
};

// Set the pinout configuration (set using menuconfig)
i2s_pin_config_t pin_config = {
    .mck_io_num = I2S_PIN_NO_CHANGE,
    .bck_io_num = CONFIG_EXAMPLE_I2S_CLK_GPIO,
    .ws_io_num = 0,
    .data_out_num = I2S_PIN_NO_CHANGE,
    .data_in_num = CONFIG_EXAMPLE_I2S_DATA_GPIO,
};

// Call driver installation function before any I2S R/W operation.
ESP_ERROR_CHECK( i2s_driver_install(CONFIG_EXAMPLE_I2S_CH, &i2s_config, 0, NULL) );
ESP_ERROR_CHECK( i2s_set_pin(CONFIG_EXAMPLE_I2S_CH, &pin_config) );
ESP_ERROR_CHECK( i2s_set_clk(CONFIG_EXAMPLE_I2S_CH, CONFIG_EXAMPLE_SAMPLE_RATE, I2S_BITS_PER_SAMPLE_32BIT, I2S_CHANNEL_MONO) );

}

Regards Anurag Paul

[seanw214]

@PaulAnurag here are my configuration settings. I hope this helps.

const i2s_config_t i2s_config_1 = { .mode = I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_RX, .sample_rate = 16000, .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT, .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT, .communication_format = I2S_COMM_FORMAT_STAND_I2S, // I2S_COMM_FORMAT_STAND_MSB <- big-endian .intr_alloc_flags = ESP_INTR_FLAG_INTRDISABLED, // ESP_INTR_FLAG_INTRDISABLED //ESP_INTR_FLAG_LEVEL1 .dma_buf_count = 8, // number of buffers .dma_buf_len = 1024 /, //64 .use_apll = false, .tx_desc_auto_clear = false/ };

i2s_pin_config_t pin_config = {
    .bck_io_num = I2S_BCK_IO,     // GPIO2
    .ws_io_num = I2S_WS_IO,       // GPIO19
    .data_out_num = I2S_DO_IO,  // GPIO5
    .data_in_num = I2S_DI_IO};     // GPIO36

[PaulAnurag]

@seanw214 Is there any example code that you know which I can refer?