Calling nvs_flash_deinit() Causes WiFi.begin() to Fail

[emintz]

Board

AITRIP 38pin ESP-WROOM-32 ESP32 ESP-32S Development Board (https://www.amazon.com/gp/product/B0B12822SF/ref=ppx_yo_dt_b_search_asin_title?th=1)

Device Description

This is the bare board as provided by the manufacturer. It is a bare bones system consisting of an ESP32 S2 with builtin WiFi antenna on a board with a voltage regulator, LED, USB interface, and a few other supporting parts. It is a generic, low-end product that I bought because it is inexpensive and works.

Hardware Configuration

No peripherals are attached.

Version

v3.0.3

IDE Name

Sloeber

Operating System

Ubuntu 22.04

Flash frequency

80 MHz

PSRAM enabled

no

Upload speed

115200

Description

I need to retrieve WiFi credentials and other configuration settings from NVRAM. I will run a short configuration sketch to set them, then install the application that will retrieve them. I have disabled "wipe flash on upload".

I am using the nvs library to retrieve the configuration values. WiFi.begin() fails if I invoke nvs_flash_deinit().

Sketch

Here's the entire sketch. Note that the two static char arrays will hold the retrieved credentials in the final version. Note that I have redacted sensitive information.

--------------------------------------------------------------------------------

#include "Arduino.h"
#include "WiFi.h"
#include <cstring>

#include "nvs_flash.h"

static char ssid[64];
static char password[64];

void setup() {
  Serial.begin(115200);
  Serial.print("Simple, brain dead WIFI station starting, compiled on ");
  Serial.print(__DATE__);
  Serial.print(" at ");
  Serial.print(__TIME__);
  Serial.println(".");

  esp_err_t esp_status;

  if (ESP_OK == (esp_status = nvs_flash_init())) {
    Serial.println("Flash memory initialized.");
  } else {
    Serial.printf("Flash initialization failed with status %x.\n", esp_status);
  }
//  WiFi.begin() fails if this code is uncommented
//      |                       |
//      v                       v
//
//  if (ESP_OK == (esp_status = nvs_flash_deinit())) {
//    Serial.println("Flash shut down successfully.");
//  } else {
//    Serial.printf("Flash shut down failed with status %x.\n", esp_status);
//  }
//      ^                       ^
//      |                       |
// End of block.

  memset(ssid, 0, sizeof(ssid));
  memset(password, 0, sizeof(password));

  WiFi.begin("SSID", "*********");
  Serial.print("Waiting for WiFi connection ");
  while (WiFi.status() != wl_status_t::WL_CONNECTED) {
    vTaskDelay(pdMS_TO_TICKS(500));
    Serial.print('.');
  }
  Serial.println(" done!");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

}

// The loop function is called in an endless loop
void loop()
{
//Add your repeated code here
}

--------------------------------------------------------------------------------
Work around: don't shutdown non-volatile storage.

Debug Message

The sketch runs perfectly when nvs_flash_deinit() is not invoked and produces the following output:

Simple, brain dead WIFI station starting, compiled on Jul 18 2024 at 17:21:33.
Flash memory initialized.
Waiting for WiFi connection . done! 
IP address: 192.168.XX.XX

When the nvs_flash_deinit() is invoked before WiFi.begin(), it produces:

Simple, brain dead WIFI station starting, compiled on Jul 18 2024 at 17:16:11.
Flash memory initialized.
Flash shut down successfully.
E (38) wifi_init: Failed to deinit Wi-Fi driver (0x3001)
E (38) wifi_init: Failed to deinit Wi-Fi (0x3001)
[    42][E][WiFiGeneric.cpp:248] wifiLowLevelInit(): esp_wifi_init 4353
[    58][E][STA.cpp:298] begin(): STA enable failed!
Waiting for WiFi connection ...............................................................

The connection wait hangs until I power off the board.

Other Steps to Reproduce

Sorry, nothing comes to mind.

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[me-no-dev]

NVS is used by WiFi. Why are you deiniting it?

[emintz]

Thank you for answering so quickly. The dependency appears not to be documented, so I thought I could save resources by removing it when I no longer need it. Please consider marking the issue as a request that the dependency be documented..

…

On Fri, Jul 19, 2024, 03:04 Me No Dev ***@***.***> wrote: NVS is used by WiFi. Why are you deiniting it? — Reply to this email directly, view it on GitHub <#10048 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AD6QNG3NR5CPHL6N7QRRL2LZNC27NAVCNFSM6AAAAABLDPJKP2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDEMZYGUYTENJXHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[OrhanYigitDurmaz]

Thank you for answering so quickly. The dependency appears not to be documented, so I thought I could save resources by removing it when I no longer need it. Please consider marking the issue as a request that the dependency be documented..
…
On Fri, Jul 19, 2024, 03:04 Me No Dev @.> wrote: NVS is used by WiFi. Why are you deiniting it? — Reply to this email directly, view it on GitHub <#10048 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AD6QNG3NR5CPHL6N7QRRL2LZNC27NAVCNFSM6AAAAABLDPJKP2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDEMZYGUYTENJXHA . You are receiving this because you authored the thread.Message ID: @.>

its documented actually