[FLASH] User data storage

[piotrva]

Dear all,

I wanted to ask which sectors of flash memory can be used for user data storage (ex. configuration, login/password). For now I'm using external memory, but it would be less costly to use some sectors of the on-board flash. I tried to write data in some sectors written with blank.bin, but finally 2 pcs of ESP8266 module were bricked (no possibility to download any application using download tool).

I would be very grateful for a complete memory map and some example codes, explaining how to safely use on-board flash to store custom data.

The purpose is to have a device, configured using web interface (available via AP) and then store data in the flash in order the device to connect in ST mode automatically and also save user password to protect config. changes.

Such software I have prepared but with usage of external memory.

Thank you in advice for any help.

[datltq]

Hi,

The memory map can be referred here:
https://github.com/esp8266/esp8266-wiki/wiki/Memory-Map

Also, in the "2A-ESP8266__IOT_SDK_User_Manual__EN", there mentioned a flash area called "user data" which is safe to read and write your own data.

For the problem of bricking device when overwriting blank.bin, I don't think it could bricks the device. It seems downloading flash is handled by internal ROM, which is not write-able by any chances. Could somebody confirm this?

Dat.

[ESP_Faye]

Hi，

Flash map please refer to documentation 2A-ESP8266__IOT_SDK_User_Manual.

Flash read/write with protection please refer to documentation 99A-ESP8266__Flash_RW_Operation.

Thanks for your interest in Espressif Systems and ESP8266 !

[yogasuhas]

Hi，

Flash map please refer to documentation 2A-ESP8266__IOT_SDK_User_Manual.

Flash read/write with protection please refer to documentation 99A-ESP8266__Flash_RW_Operation.

Thanks for your interest in Espressif Systems and ESP8266 !

Hi,

Requested topics are not available on the URLs.
Please share latest information regarding writing user data on flash.

Thank you!

[ESP_Faye]

Hi,

Sorry that the url is changed, please try it again.

Flash map please refer to documentation 2A-ESP8266__IOT_SDK_User_Manual.

Flash read/write with protection please refer to documentation 99A-ESP8266__Flash_RW_Operation.

Thanks for your interest in Espressif Systems and ESP8266 !

[yogasuhas]

Hi,

Thank you! for the support, i found documents are in Chinese language!
Do i get English version one.

Best regards!

[Lurch]

Look further down the page. After the chnese versions are the english versions (_EN.pdf ending)

[Lurch]

Look further down the page. After the chnese versions are the english versions (_EN.pdf ending)
2A is there in english, but 99A-ESP8266__Flash_RW_Operation__EN_v0.2 seems to be missing. Maybe the spelling is different now.

[NASATEC]

Hello,
We are looking the way to turn on ESP8266 and automatically connect on ST mode.
Could you please help us?