Arduino-esp32: SPIFFS.begin() crash in library use

[merlinschumacher]

Hardware:

Board: Wemos Lolin 32 V1.0.0
Core Installation/update date: 12. Nov 17
IDE name: Arduino IDE
Flash Frequency: 40Mhz/80Mhz
Upload Speed: 115200/921600

Description:

Trying to use the SPIFFS.begin() inside a library triggers an exception on the ESP32 which leads to a reboot.
Moving SPIFFS.begin() inside the Sketch works fine.

Sketch:

//Change the code below by your sketch

#include "test.h"

test test;

void setup() {
    Serial.begin(115200);  
}

void loop() {
  // put your main code here, to run repeatedly:

}

test.cpp

#include "test.h"

#include "SPIFFS.h"

test::test()
{

  SPIFFS.begin(true);
}

test.h

#ifndef test_h
#define test_h


class test {
  public:
    test();

};

#endif

Debug Messages:

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:0x3fff0018,len:4
load:0x3fff001c,len:956
load:0x40078000,len:0
load:0x40078000,len:11904
entry 0x40078a3c
/Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/freertos/./queue.c:1438 (xQueueGenericReceive)- assert failed!
abort() was called at PC 0x400845e9 on core 0

Backtrace: 0x40086fb0:0x3ffe3920 0x400870af:0x3ffe3940 0x400845e9:0x3ffe3960 0x400df975:0x3ffe39a0 0x400830a7:0x3ffe39c0 0x40083a6a:0x3ffe39e0 0x40083c83:0x3ffe3a10 0x400df9d1:0x3ffe3a40 0x400dfb3e:0x3ffe3a70 0x400dfb8f:0x3ffe3a90 0x400dffd2:0x3ffe3ab0 0x400e0884:0x3ffe3af0 0x400d0af8:0x3ffe3b70 0x400d0a45:0x3ffe3ba0 0x400d0a96:0x3ffe3bc0 0x400dcc5b:0x3ffe3be0 0x40081238:0x3ffe3c00 0x4008140d:0x3ffe3c30 0x40078892:0x3ffe3c50 0x400788f9:0x3ffe3c80 0x40078a36:0x3ffe3cb0 0x40078b5b:0x3ffe3e70 0x40007c31:0x3ffe3eb0 0x4000073d:0x3ffe3f20

Rebooting...

Exception Decoder

Decoding 24 results
0x40086fb4: invoke_abort at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/./panic.c line 553
0x400870b3: abort at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/./panic.c line 553
0x400845ed: xQueueGenericReceive at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/freertos/./queue.c line 1992
0x400df475: spi_flash_op_lock at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/spi_flash/./cache_utils.c line 56
0x40083003: spi_flash_disable_interrupts_caches_and_other_cpu at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/spi_flash/./cache_utils.c line 95
0x400839c6: spi_flash_mmap_pages at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/spi_flash/./flash_mmap.c line 143
0x40083bdf: spi_flash_mmap at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/spi_flash/./flash_mmap.c line 120
0x400df4d1: load_partitions at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/spi_flash/./partition.c line 225
0x400df63e: esp_partition_find at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/spi_flash/./partition.c line 225
0x400df68f: esp_partition_find_first at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/spi_flash/./partition.c line 225
0x400dfad2: esp_spiffs_init at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/spiffs/./esp_spiffs.c line 387
0x400e0384: esp_vfs_spiffs_register at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/spiffs/./esp_spiffs.c line 414
0x400d0a48: fs::SPIFFSFS::begin(bool, char const*, unsigned char) at /home/merlin/Arduino/hardware/espressif/esp32/libraries/SPIFFS/src/SPIFFS.cpp line 92
0x400d09ad: test::test() at /tmp/arduino_build_420497/sketch/test.cpp line 8
0x400d09fe: _GLOBAL__sub_I_test at /home/merlin/Arduino/test/test.ino line 3
:  (inlined by) _GLOBAL__sub_I_test at /home/merlin/Arduino/test/test.ino line 15
0x400dc75b: do_global_ctors at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/./cpu_start.c line 412 (discriminator 3)
0x40081194: start_cpu0_default at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/./cpu_start.c line 335
0x40081369: call_start_cpu0 at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/esp32/./cpu_start.c line 210

[me-no-dev]

You can not call it in the class constructor ;) you need to call it later (like begin() which is called in setup())

[twisniew1976]

@me-no-dev : Why calling SPIFFS.begin is prohibited inside class constructors ?

[stickbreaker]

@twisniew1976 When the object is defined as a global object, it is initiated before all of the runtime support is ready. In the class constructor, you can only initialize static values, SPIFFS.begin() sets up dynamic memory buffers.

If you changed the example object from a global object you could have your object execute SPIFFS.begin() in its constructor.

void setup(){
test test;
}

Would work just fine, because setup() is called after all of the runtime support is correctly configured.
Or if you need global visibility, create a global pointer and then initialize it in setup;

test *test;

void setup(){
test = new test;
}

This way, it is not initialized until after the runtime support is live. But, since it is a pointer you would have to access it test-> instead of test.

Chuck.

[i4things]

There is a proper C+ way to ensure that a class/ function is called before it is used ( usually used when a logging library is used) the ESP32 runtime should use it make to ensure the full runtime is properly initialized before anything else