Mitch Bradley 8d9e110a04 Reverts Backtrace: format to what it used to be
Was:  Backtrace: N:M N:M N:M ...
Now:  Backtrace:N:MN:M N:M ...

The problem with the new format is that it is hard to parse and
breaks the parser that is used by PlatformIO.  The old format
is much more reasonable.  I do not see how the pattern in IDFDUT.py
can work with the new format, due to the missing space after the :
2022-06-10 18:33:46 -10:00
..
2022-05-18 20:12:25 +08:00
2021-03-31 19:17:33 +08:00
2022-03-01 19:49:24 +03:00
2021-02-24 12:16:37 +08:00
2022-05-18 20:12:25 +08:00
2021-03-25 16:09:33 +08:00

System Notes

Timekeeping

The following are the timekeeping mechanisms available and their differences:

  1. System time (esp_system_get_time)

Time with the origin at g_startup_time. The implementation is not handled by esp_system, but it does provide a default implementation using RTC timer. Currently, esp_timer provides system time, since the hardware timers are under the control of that component. However, no matter the underlying timer, the system time provider should maintain the definition of having the origin point at g_startup_time.

  1. esp_timer time (esp_timer_get_time)

This is the time read from an underlying hardware timer, controlled through config. Origin is at the point where the underlying timer starts counting.

  1. newlib time (gettimeofday)

Timekeeping function in standard library. Can be set (settimeofday) or moved forward/backward (adjtime); with the possibility of the changes being made persistent through config. Currently implemented in terms of system time, as the point of origin is fixed. If persistence is enabled, RTC time is also used in conjuction with system time.

  1. RTC time (esp_rtc_get_time_us)

Time read from RTC timer.