esp32-s2 chip using Preferences library to store string but lost after the restart

[Kevin-CEN]

I wanted to use the Preferences library to store strings, using the ESP32-S2 chip, and using the official example StartCounter. ino to test, I compiled and burned without any problems, but when ESP32-S2 ran the program, the numbers didn't add up so should have been lost after the restart.
This is the output of the MCU:
ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x40026168
SPIWP:0xee
mode:DIO, clock div:2
load:0x3ffe6100,len:0x424
load:0x4004c000,len:0x844
load:0x40050000,len:0x2460
entry 0x4004c180

Current counter value: 1
Restarting in 10 seconds...
ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x40026168
SPIWP:0xee
mode:DIO, clock div:2
load:0x3ffe6100,len:0x424
load:0x4004c000,len:0x844
load:0x40050000,len:0x2460
entry 0x4004c180

Current counter value: 1
Restarting in 10 seconds...
ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x40026168
SPIWP:0xee
mode:DIO, clock div:2
load:0x3ffe6100,len:0x424
load:0x4004c000,len:0x844
load:0x40050000,len:0x2460
entry 0x4004c180

Current counter value: 1
Restarting in 10 seconds...
ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x40026168
SPIWP:0xee
mode:DIO, clock div:2
load:0x3ffe6100,len:0x424
load:0x4004c000,len:0x844
load:0x40050000,len:0x2460
entry 0x4004c180

Current counter value: 1
Restarting in 10 seconds...
############################
This is my platformio.ini configuration：
[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
board_build.mcu = esp32s2
platform_packages =
framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32#2.0.0-alpha1
############################

[atanisoft]

@Kevin-CEN I think this may have been fixed by #5309 which should be available in the 2.0.0 release. Can you retest with the 2.0.0 release?

[Kevin-CEN]

@Kevin-CEN I think this may have been fixed by #5309 which should be available in the 2.0.0 release. Can you retest with the 2.0.0 release?
Thanks, but I'm not quite sure how to get back to version 2.0.0.
Esp32-s2 doesn't have very good Arduino support.

[atanisoft]

@Kevin-CEN Adjust your platformio.ini to have:

framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32#2.0.0

Most of the ESP32-S2 peripherals should have compatible Arduino code already, if you find an exception to this though do log an issue for tracking/consideration.

[Kevin-CEN]

@atanisoft
Thank you very much, I should be using version 2.0.0, but I added '-alpha1', if not '-alpha1' will have this error

/Users/kevin/.platformio/packages/toolchain-xtensa32s2/bin/../lib/gcc/xtensa-esp32s2-elf/8.4.0/../../../../xtensa-esp32s2-elf/bin/ld: final link failed: bad value
collect2: error: ld returned 1 exit status
*** [.pio/build/esp32dev/firmware.elf] Error 1

[atanisoft]

@Kevin-CEN That link error looks related to PIO breaking the builds, I guess you will need to wait for the 2.0.0 release to be picked up by PIO instead. Usually they will pick up a new stable release within a few days of release.

[Kevin-CEN]

@atanisoft Thank you very much.The problem doesn't seem to have been solved.

[chegewara]

I can confirm there is in general issue with NVS storage on PIO using arduino v2.0.0+.
platformio/platform-espressif32#564

There is also some topic on forum about it.

[Jason2866]

Mhh, i get this

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DOUT, clock div:1
load:0x3ffe6100,len:0x7c
load:0x4004c000,len:0x7e4
load:0x40050000,len:0x2598
entry 0x4004c15c

Current counter value: 7
Restarting in 10 seconds...

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x400260ec
SPIWP:0xee
mode:DOUT, clock div:1
load:0x3ffe6100,len:0x7c
load:0x4004c000,len:0x7e4
load:0x40050000,len:0x2598
entry 0x4004c15c

Current counter value: 8
Restarting in 10 seconds...

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x400260ec
SPIWP:0xee
mode:DOUT, clock div:1
load:0x3ffe6100,len:0x7c
load:0x4004c000,len:0x7e4
load:0x40050000,len:0x2598
entry 0x4004c15c

Current counter value: 9
Restarting in 10 seconds...

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x400260ec
SPIWP:0xee
mode:DOUT, clock div:1
load:0x3ffe6100,len:0x7c
load:0x4004c000,len:0x7e4
load:0x40050000,len:0x2598
entry 0x4004c15c

Current counter value: 10

Compiled with Platformio

[Kevin-CEN]

@Jason2866 Yours seems to be all right.Can I have a look at your platformio.ini file？

[Jason2866]

@Kevin-CEN, reused the setup from the Project Tasmota (i am a member).
The relevant part is this https://github.com/arendst/Tasmota/blob/development/platformio_tasmota_cenv_sample.ini#L47-L60
We do build our own SDK libs since we need some changed settings in IDF (sdkconfig)

[Kevin-CEN]

@Jason2866 Thank you very much.But this configuration file of yours seems too complicated, I just tried it, it will compile wrong.
My project is very simple, I just hope THAT ESP32S2 can normally use the Preferences library in the Arduino framework, is there any other way I can set it up?

[Jason2866]

@Kevin-CEN Okay, simplified :-)

[env:esp32-s2-saola-1]
platform = https://github.com/platformio/platform-espressif32.git#feature/arduino-idf-master
platform_packages = tasmota/framework-arduinoespressif32 @ 2.0.0+tasmota
board = esp32-s2-saola-1
framework = arduino

main.cpp

/*
 ESP32 startup counter example with Preferences library.

 This simple example demonstrates using the Preferences library to store how many times the ESP32 module has booted. 
 The Preferences library is a wrapper around the Non-volatile storage on ESP32 processor.

 created for arduino-esp32 09 Feb 2017 by Martin Sloup (Arcao)

 Complete project details at https://RandomNerdTutorials.com/esp32-save-data-permanently-preferences/
*/

#include <Arduino.h>
#include <Preferences.h>

Preferences preferences;

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

  // Open Preferences with my-app namespace. Each application module, library, etc
  // has to use a namespace name to prevent key name collisions. We will open storage in
  // RW-mode (second parameter has to be false).
  // Note: Namespace name is limited to 15 chars.
  preferences.begin("my-app", false);

  // Remove all preferences under the opened namespace
  //preferences.clear();

  // Or remove the counter key only
  //preferences.remove("counter");

  // Get the counter value, if the key does not exist, return a default value of 0
  // Note: Key name is limited to 15 chars.
  unsigned int counter = preferences.getUInt("counter", 0);

  // Increase counter by 1
  counter++;

  // Print the counter to Serial Monitor
  Serial.printf("Current counter value: %u\n", counter);

  // Store the counter to the Preferences
  preferences.putUInt("counter", counter);

  // Close the Preferences
  preferences.end();

  // Wait 10 seconds
  Serial.println("Restarting in 10 seconds...");
  delay(10000);

  // Restart ESP
  ESP.restart();
}

void loop() {

}

[yangminglong]

Can you explain what went wrong with platform IO?