Erasing NVS memory

[grzegorzwozny]

Hello,
How to erasing Non-Volatile Storage memory in ESP32 using MicroPython?

I store data in NVS as key:value in namespace:

namespace1 {
  key1:value1
  key2:value2
}
namespace2 {
  key:value2
}

In C/C++ is it easy to do using nvs_flash.h module:

#include <nvs_flash.h>

void setup() {
  nvs_flash_erase(); // erase the NVS partition and...
  nvs_flash_init(); // initialize the NVS partition.
  while(true);
}

void loop() {

}

In class esp32.NVS I see only one function NVS.erase_key(key) to erase single key but how to erase all namespaces and keys?

[grzegorzwozny]

At the moment, I see only one option to erase the NVS partition. Based on the address and size information of the NVS partition:

# ESP-IDF Partition Table
# Name,   Type, SubType, Offset,  Size, Flags
nvs,      data, nvs,     0x9000,  0x4000,
otadata,  data, ota,     0xd000,  0x2000,
phy_init, data, phy,     0xf000,  0x1000,
factory,  app,  factory, 0x10000,  1M,
ota_0,    app,  ota_0,   0x110000, 1M,
ota_1,    app,  ota_1,   0x210000, 1M,

I can use esptool to achieve this, like this:
esptool.py erase_region 0x9000 0x4000

But this is not a solution. I looking for a function for do this...

[karfas]

But this is not a solution. I looking for a function for do this...

You can do the same thing, I think, from within micropython using Partition.writeblocks().

See https://docs.micropython.org/en/latest/library/esp32.html; some example usage comes with micropython in esp32/modules.

[FeroxTL]

import esp32
import machine

p = esp32.Partition.find(esp32.Partition.TYPE_DATA, label='nvs')[0]

# p.info()[3] is partition size
for x in range(int(p.info()[3] / 4096)):
    p.writeblocks(x, bytearray(4096))

machine.reset()

This would completely erase NVS partition. machine.reset is required to reinitialize micropython structures