NVS – Bernd's development stuff

Expansion of NVS partition requires adapt default app partition address in esptool

If you want to increase the size of the NVS partition, the start address of the app partition changes as well. But Arduino IDE (using esptool to flash the ESP32) has the start address hard-coded. If, for example, you change your partition table into

Name, Type, SubType, Offset, Size, Flags
nvs, data, nvs, 0x9000, 0x15000,
otadata, data, ota, 0x1e000, 0x2000,
app0, app, ota_0, 0x20000, 0x140000,
app1, app, ota_1, 0x160000,0x140000,
eeprom, data, 0x99, 0x2A0000,0x1000,
spiffs, data, spiffs, 0x2A1000,0x15F000,

Name, Type, SubType, Offset, Size, Flags

nvs, data, nvs, 0x9000, 0x15000,

otadata, data, ota, 0x1e000, 0x2000,

app0, app, ota_0, 0x20000, 0x140000,

app1, app, ota_1, 0x160000,0x140000,

eeprom, data, 0x99, 0x2A0000,0x1000,

spiffs, data, spiffs, 0x2A1000,0x15F000,

The new start address for the application would be 0x20000 instead of 0x10000. Arduino IDE would flash the application, but to the wrong address. To flash the app to the correct address there are 2

WiFi connection problem – NVS corrupted

If you have WiFi connection problems where WiFi.status() always returns WL_NO_SSID_AVAIL even you are sure that the AP is available and working, it might be that the NVS storage has been corrupted. The NVS storage is the place where esp-idf stores the WiFi credentials. See issue wifi connection problem on Arduino-esp32. To check if your NVS storage is corrupted you can use ESP32-Show_nvs_keys provided by stickbreaker. If your NVS storage is corrupted you can use the following code snippet to

Bernd's development stuff

Software and hardware tips about Arduino, ESP chips and Android applications

Tag: NVS

Expansion of NVS partition requires adapt default app partition address in esptool

WiFi connection problem – NVS corrupted