Mahavir Jain 81e3eb45ca cpu_start: rename function to add core prefix for more clarity пре 4 година
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include 4869b3cd4a WDT: Add support for XTAL32K Watchdog timer пре 4 година
ld 881e1b0fd5 deep sleep: add deep sleep support for esp32s3 пре 4 година
port 81e3eb45ca cpu_start: rename function to add core prefix for more clarity пре 4 година
test e8188e5d8f ci: replacing old header with new SPDX header style пре 4 година
test_eh_frame_parser 0771bd1711 espsystem: Rearchitecture and fix eh_frame_parser bugs пре 4 година
CMakeLists.txt 4869b3cd4a WDT: Add support for XTAL32K Watchdog timer пре 4 година
Kconfig 9298db641e deep sleep: fix some rtc fast memory definition errors in esp32s3 пре 4 година
Makefile.projbuild b06dba7823 esp32: move app linker scripts пре 4 година
README.md 32aa5f7e25 esp_system: add notes on timekeeping пре 4 година
app.lf bbc599493e esp32: move common fragment definitions пре 4 година
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dbg_stubs.c 2a5d0a041e gcov: add stub table size entry пре 4 година
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fpga_overrides.c 1a626ef6ca esp32: App can boot on FPGA image пре 4 година
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README.md

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.