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| author | Paul Sokolovsky <pfalcon@users.sourceforge.net> | 2017-04-07 10:52:50 +0300 |
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| committer | Paul Sokolovsky <pfalcon@users.sourceforge.net> | 2017-04-07 10:52:50 +0300 |
| commit | e5278b98fe2aad840d58e33a0c06af2e2b55cbde (patch) | |
| tree | 7df7e14e75e4be26b636b49f23bb4bdf958e1d19 | |
| parent | d7310fabc22ebf45aedcaade1c531ece96c33bf0 (diff) | |
| download | micropython-e5278b98fe2aad840d58e33a0c06af2e2b55cbde.tar.gz micropython-e5278b98fe2aad840d58e33a0c06af2e2b55cbde.zip | |
docs/esp8266/general: Start explicit "Known Issues", mentioned RTC inaccuracy.
| -rw-r--r-- | docs/esp8266/general.rst | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/docs/esp8266/general.rst b/docs/esp8266/general.rst index cd659f80a9..47df80d7ba 100644 --- a/docs/esp8266/general.rst +++ b/docs/esp8266/general.rst @@ -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 |