Kimi | ESP32 NVS WiFi Conflict

I’ve run into an unusual issue with my ESP32 WROOM board. I can read and write to the NVS (Non Volatile Storage) when WiFi isn’t enabled, but as soon as WiFi get enabled, I can no longer write to the NVS. It seems there is either a timing issue or conflict of some kind that is getting in the way. Has anyone else run into this, and if so.. how did you resolve it?

This is a known issue in the ESP-IDF ecosystem. Let me search for the most current information and solutions regarding NVS write failures when WiFi is enabled on ESP32 WROOM modules.

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ESP32 NVS write fails when WiFi enabled ESP32 WROOM NVS WiFi conflict ESP32 NVS timing issue WiFi workaround ESP32 NVS write error WiFi initialized

25 个结果

This is a well-documented issue in the ESP32 ecosystem. You're encountering a resource contention problem between the WiFi driver and user NVS operations. Here's what's happening and how to fix it:

Root Cause

When WiFi is enabled on ESP32, the WiFi driver also uses NVS internally to store:

RF calibration data (phy_init)
WiFi configuration (SSID, passwords, channel info)
Connection state blobs

This creates a race condition or SPI flash bus contention when your application tries to write to NVS while WiFi is active. The WiFi driver may hold the flash access lock during critical operations, causing your NVS writes to fail silently or timeout .

Solutions (Most to Least Recommended)

1. Use `nvs_commit()` Explicitly & Add Delays

Don't rely on automatic NVS commit. Close handles immediately after writes and add small delays:

cpp

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esp_err_t safe_nvs_write(const char* key, const char* value) {
    nvs_handle_t handle;
    esp_err_t err = nvs_open("storage", NVS_READWRITE, &handle);
    if (err != ESP_OK) return err;
    
    err = nvs_set_str(handle, key, value);
    if (err == ESP_OK) {
        err = nvs_commit(handle);  // Force immediate write
    }
    nvs_close(handle);
    
    // Critical: Yield to WiFi task
    vTaskDelay(pdMS_TO_TICKS(10));  
    return err;
}

2. Defer NVS Writes Until WiFi is Idle

Only write to NVS before WiFi.begin() or after WiFi is fully connected and stable:

cpp

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void setup() {
    // Phase 1: Read/Write NVS before WiFi starts
    nvs_flash_init();
    load_configuration();  // Safe to read
    
    // Phase 2: Start WiFi
    WiFi.begin(ssid, pass);
    
    // Phase 3: Wait for connection before any NVS writes
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
    }
    // Now NVS writes are safer, but still use solution #1
}

3. Increase Task Priority or Use a Dedicated NVS Task

Run NVS operations in a high-priority task that preempts WiFi tasks temporarily:

cpp

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// Run NVS write at priority 20+ (higher than WiFi driver's typical 23)
xTaskCreatePinnedToCore(nvs_write_task, "nvs_task", 4096, NULL, 20, NULL, 1);

4. Check for Corrupted NVS Partition

If WiFi initialization corrupted NVS, erase and reinitialize :

cpp

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esp_err_t err = nvs_flash_init();
if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
    ESP_ERROR_CHECK(nvs_flash_erase());
    err = nvs_flash_init();
}
ESP_ERROR_CHECK(err);

5. Disable WiFi NVS (Advanced)

If you don't need WiFi to store credentials in NVS, disable it in menuconfig:

plain

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Component config → Wi-Fi → WiFi NVS flash

Then manage WiFi credentials manually in RAM only. Warning: This prevents automatic WiFi reconnection on reboot.

Debugging Tips

Enable verbose logging to see NVS conflicts:

cpp

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esp_log_level_set("nvs", ESP_LOG_VERBOSE);
esp_log_level_set("wifi", ESP_LOG_VERBOSE);

Check error codes: If nvs_set_* returns ESP_ERR_NVS_NOT_INITIALIZED or ESP_ERR_NVS_PART_NOT_FOUND, the partition is likely corrupted .
Use esp_err_to_name(err) to decode error codes instead of guessing.

Community Confirmation

This exact issue has been reported in the ESP32 forums and GitHub issues . The consensus is that timing and proper handle management are the reliable fixes, not partition table changes.

Which framework are you using (Arduino, ESP-IDF, or PlatformIO)? I can provide more specific code examples for your environment.

ESP32 NVS WiFi Conflict