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Diffstat (limited to 'docs/esp8266/general.rst')
| -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 |