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Commit e5278b98 authored by Paul Sokolovsky's avatar Paul Sokolovsky
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docs/esp8266/general: Start explicit "Known Issues", mentioned RTC inaccuracy.

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...@@ -107,8 +107,16 @@ This will allow to keep the structure of your application clear, as well as ...@@ -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. allow to install multiple applications on a board, and switch among them.
Known Issues
------------
Real-time clock 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) 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 will overflow every 7:45h. If a long-term working RTC time is required then
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