ESP32 I2S microphone [RX] (SPH0645LM4H microphone)

[khanware]

I am trying to connect I2S mic (SPH0645LM4H-B mic) to ESP32 with no luck.

my code is given below:

#include "driver/i2s.h"
const i2s_port_t I2S_PORT = I2S_NUM_1;

void setup() {
Serial.begin(115200);
esp_err_t err;

// The I2S config as per the example
const i2s_config_t i2s_config = {
.mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX), // Receive, not transfer
.sample_rate = 16000, // 16KHz
.bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT, // could only get it to work with 32bits
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT, // use right channel
.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB),
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, // Interrupt level 1
.dma_buf_count = 4, // number of buffers
.dma_buf_len = 1024 // 8 samples per buffer (minimum)
};

// The pin config as per the setup
const i2s_pin_config_t pin_config = {
.bck_io_num = GPIO_NUM_34, // Serial Clock (SCK)
.ws_io_num = GPIO_NUM_32, // Word Select (WS)
.data_out_num = I2S_PIN_NO_CHANGE, // not used (only for speakers)
.data_in_num = GPIO_NUM_35 // Serial Data (SD)
};
pinMode(GPIO_NUM_35, INPUT);

// Configuring the I2S driver and pins.
// This function must be called before any I2S driver read/write operations.
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);
}
Serial.println("I2S driver installed.");
}

void loop() {
// Read a single sample and log it for the Serial Plotter.
int32_t sample = 0;
int bytes_read = i2s_pop_sample(I2S_PORT, (char *)&sample, portMAX_DELAY); // no timeout
if (bytes_read > 0) {
Serial.println(sample);
}
}

however all i am getting is 0s. Can somebody help me?
i would greatly appreciate any help on this.

I have attached Circuit Diagram. Pl find it in the attachment.