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docs/esp8266/general: Start explicit "Known Issues", mentioned RTC inaccuracy.

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Paul Sokolovsky 2017-04-07 10:52:50 +03:00
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docs/esp8266/general.rst
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@ -107,8 +107,16 @@ This will allow to keep the structure of your application clear, as well as
allow to install multiple applications on a board, and switch among them.
Known Issues
------------
Real-time clock
---------------
~~~~~~~~~~~~~~~
RTC in ESP8266 has very bad accuracy, drift may be seconds per minute. As
a workaround, to measure short enough intervals you can use
``utime.time()``, etc. functions, and for wall clock time, synchronize from
the net using included ``ntpdate.py`` module.
Due to limitations of the ESP8266 chip the internal real-time clock (RTC)
will overflow every 7:45h. If a long-term working RTC time is required then