ESP32 RTC RAM

[tshcherban]

Can we use rtc ram for esp32? To not wear spiffs on each reboot

[khoih-prog]

No. Currently, RTC only designed and used for ESP8266.

For ESP32, only flash-simulated-EEPROM, SPIFFS and LitttleFS are available.

But LItttleFS or SPIFFS, with wear-levelling, is better to use than fixed-address EEPROM on ESP32.

To not wear spiffs on each reboot

If your ESP32 is badly designed to reboot every second, don't use either SPIFFS or LittleFS for anything.

[tshcherban]

Actually it's designed to power on once and run (until power outage) but still interesting.
I thought rtc ram is the same in both 8266 and 32

[khoih-prog]

Sure ESP32 RTC RAM is similar to ESP8266's

For ESP8266, the rtcUserMemoryRead() and rtcUserMemoryWrite() are used. You can use similar way for ESP32 RTC.

But I'm just not interested enough to use in ESP32. It's simple to adapt the code to ESP32, you can also do it for your use-case, if necessary and interested.

Check Deep Sleep Wake Stubs