ESP32 Forum

Posted: **Wed Feb 12, 2025 11:26 am**

Hello,

we have a device with an ST-MEMS microphone IMP34DT05 on an ESP32 device, it worked with the idf 4.x.x. Here is the configuration:

Code: Select all

#define ICS41350_PIN_CLK 4
#define ICS41350_PIN_DATA 2

void ICS41350_init(void) 
{
    i2s_pin_config_t pin_config;
	pin_config.bck_io_num = I2S_PIN_NO_CHANGE;
	pin_config.ws_io_num = ICS41350_PIN_CLK;
	pin_config.data_out_num = I2S_PIN_NO_CHANGE;
	pin_config.data_in_num = ICS41350_PIN_DATA;	
	
  i2s_config_t i2s_config = {
    .mode = I2S_MODE_MASTER | I2S_MODE_RX| I2S_MODE_PDM,
    .sample_rate = 16000,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
    .channel_format = I2S_CHANNEL_FMT_ALL_RIGHT, 
    .communication_format = I2S_COMM_FORMAT_I2S, 
    .intr_alloc_flags = 0,
    .dma_buf_count = 6, //8,
    .dma_buf_len = 320, //256
	};
  
    i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
    i2s_set_pin(I2S_NUM_0, &pin_config);
     i2s_set_pdm_rx_down_sample(I2S_NUM_0, I2S_PDM_DSR_16S);

This configuration worked well for the ESP32 and the idf version v4.x.x

Now we want to go to the ESP32 S3 and I take the esp-idf v. 5.3.1, the i2s-driver changed completly, and I cannot get my microphone to work. We also changed the PIO-Config to PDM_CLOCK is on PIO 3 and PDM_DATA is on PIO 6.

Can You give me a working code sample which works like the old configuration?

Thanks in advance:
Roland

ESP32 Forum

porting i2s - pdm driver from idf 4.x.x to 5.3.1

porting i2s - pdm driver from idf 4.x.x to 5.3.1