ESP8266 Community Forum

- Sun Jan 24, 2016 10:43 am #39571 I am trying to use rtcmem.read32() on an esp-01 but get a Nil error which I guess means rtcmem is not available. Does this require a special version of the firmware or am I missing some initialisation?

Last edited by jonwise on Sun Jan 24, 2016 12:25 pm, edited 1 time in total.

- Sun Jan 24, 2016 11:22 am #39580 Your firmware would need to have this module compiled into it, the default doesn't have it AFAIK. You can get a customized build from http://nodemcu-build.com/.
What is the exact error you face?

Docs for rtcmem are available here: https://nodemcu.readthedocs.org/en/dev/ ... es/rtcmem/

- Sun Jan 24, 2016 12:33 pm #39587 How can I find which modules are included in the build? I did a custom build including rtcmem but still get 'nil' as the value of rtcmem. Perhaps rtcmem has prerequisites? On which build has anyone successfully run rtcmem? Correction - the custom build does include rtcmem - there was a confusion because the custom build did not upload correctly with the version of esptool.py I was using.

Last edited by jonwise on Mon Feb 01, 2016 5:23 am, edited 1 time in total.

- Sun Jan 24, 2016 5:10 pm #39606

How can I find which modules are included in the build?

When compiled with the cloud build service, the included modules are listed after booting.

I did a custom build including rtcmem but still get 'nil' as the value of rtcmem. Perhaps rtcmem has prerequisites?

Not as far as I know. But it will return nil if the index is out of range.