Arduino Zero I2S DMA Microphone

[soulssh]

I'm trying to record audio samples to an external flash memory (winbond W25Q128) using Arduino-Zero board and I2S microphone (SPH0645LM4H). To not lose audio samples while writing
to the flash memory (W25Q128), I want to use DMA with I2S as described in Link to github..

My issue is : when I implement the I2S with the DMA, I got nothing in the callback (onI2SReceive) function, i.e. the callback is never triggered.. Could you help me to solve this problem?

I put a simplified version of my code in the following.

#include <I2S.h>

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  /// Some Code to initiate the flash memory (W25Q128) comes here.
  ====

  I2S.onReceive(onI2SReceive);

  // start I2S at 8 kHz with 32-bits per sample
  if (!I2S.begin(I2S_PHILIPS_MODE, 8000, 32)) {
    Serial.println("Failed to initialize I2S!");
    while (1); // do nothing
  }
}

void loop() {
}

void onI2SReceive() {
  int size = I2S.available();
  byte data[size];
  
  I2S.read(data, size);

  // Write data to the flash memory!
}