CORRUPT HEAP error when recording wav file from I2S to SD

[Valian1324]

I want to record a wav file from an INMP441 microphone to an SD card while a button is pressed. I built this code (based mostly on examples here) some time ago, and it worked flawlessly.
Now I revisited it to make it a piece in a bigger project, and the same file shows "corrupt heap", even though it does record the file without issue. (Complete output after the code)

#include "Arduino.h"
#include "AudioTools.h"
#include "SD.h"

#define SD_CS     25
#define SD_MOSI   33
#define SD_MISO   32
#define SD_SCK    15

SPIClass SPISD(HSPI);

void record(){
  I2SStream i2s; // Access I2S as a stream
  File audioFile; //empty audio file object
  EncodedAudioStream out(&audioFile, new WAVEncoder()); // Access audioFile as a stream
  StreamCopy copier(out, i2s);
  

  copier.setCheckAvailableForWrite(false);

  // configure I2S stream
  Serial.println("starting I2S...");

  auto cfg = i2s.defaultConfig(RX_MODE);
  cfg.i2s_format = I2S_STD_FORMAT; // or try with I2S_LSB_FORMAT
  cfg.channels = 1;
  cfg.sample_rate = 16000;

  i2s.begin(cfg);

  // Configure out stream
  auto cfg_out = out.defaultConfig();
  cfg_out.channels = 1;
  cfg_out.sample_rate = 16000;
  out.begin(cfg_out);

  //ACTUAL RECORDING
  audioFile = SD.open("/recording.wav", FILE_WRITE);  // Open a new file on the SD card for writing to
  copier.begin(out, i2s);
  Serial.println("RECORDING");

  while(!digitalRead(16)){
      copier.copy(); // Copy sound from I2S to the audio file
  }
  Serial.println("DONE");
  audioFile.close(); // Closes the file
  Serial.println("FILE CLOSED");
}
void setup(){
  Serial.begin(115200);

  pinMode(16, INPUT_PULLUP);

  AudioLogger::instance().begin(Serial, AudioLogger::Warning); // AudioLogger set to Debug mode

  Serial.println("SERIAL STARTED");

  SPISD.begin(SD_SCK, SD_MISO, SD_MOSI); // Begin SPI used for SD card

  if(!SD.begin(SD_CS, SPISD)) {
    Serial.println("SPI FAILED");
  }
}
void loop(){
  if(!digitalRead(16)){
    Serial.println("Clicked");
    record();
    Serial.println("HERE");
  }
}

Here, the output it gives after one button push:

Clicked
starting I2S...
RECORDING
DONE
FILE CLOSED
CORRUPT HEAP: Bad head at 0x3ffb26a8. Expected 0xabba1234 got 0x3ffb258c

assert failed: multi_heap_free multi_heap_poisoning.c:253 (head != NULL)


Backtrace: 0x400837c1:0x3ffb2320 0x400899fd:0x3ffb2340 0x4008eacd:0x3ffb2360 0x4008e75b:0x3ffb2490 0x40083b8d:0x3ffb24b0 0x4008eafd:0x3ffb24d0 0x400ed7e5:0x3ffb24f0 0x400d1bc8:0x3ffb2510 0x400d1b52:0x3ffb2530 0x400d3a3a:0x3ffb2550 0x400d40b9:0x3ffb2570 0x400d4116:0x3ffb2800 0x400d849d:0x3ffb2820




ELF file SHA256: 87f780124a897878

Rebooting...
ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0030,len:1344
load:0x40078000,len:13836
load:0x40080400,len:3608
entry 0x400805f0
SERIAL STARTED

I'm completely lost as to what is happening here, and why it used to work without this problem, any help is appreciated, thanks!

[pschatzmann]

I recommend to keep the following as global memory

  I2SStream i2s; // Access I2S as a stream
  File audioFile; //empty audio file object
  EncodedAudioStream out(&audioFile, new WAVEncoder()); // Access audioFile as a stream
  StreamCopy copier(out, i2s);

To analyse the issue you will need to learn how to analyse the stacktrace yourself !

https://arduino-esp8266.readthedocs.io/en/latest/faq/a02-my-esp-crashes.html