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esp-idf/components/esp_system
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Angus Gratton dc6b950257 doc: Add performance guides for execuion speed, binary size, RAM usage 
Closes https://github.com/espressif/esp-idf/issues/7007
Closes https://github.com/espressif/esp-idf/issues/6715
Closes https://github.com/espressif/esp-idf/issues/3781
Closes https://github.com/espressif/esp-idf/issues/2566
2021-06-03 13:55:34 +10:00
..
include doc: Add performance guides for execuion speed, binary size, RAM usage 2021-06-03 13:55:34 +10:00
port Merge branch 'bugfix/fix_728_series_reboot_failure' into 'master' 2021-04-30 03:20:47 +00:00
test esp_system: move intr_alloc 2021-04-07 17:53:37 +08:00
app.lf esp32: move common fragment definitions 2021-03-31 19:17:33 +08:00
CMakeLists.txt system: add option to enable undefined behavior sanitizer (UBSAN) 2021-04-22 23:33:45 +02:00
component.mk system: add option to enable undefined behavior sanitizer (UBSAN) 2021-04-22 23:33:45 +02:00
crosscore_int.c esp32: move crosscore int 2021-03-31 19:13:03 +08:00
dbg_stubs.c log: Remove redundant definition of LOG_LOCAL_LEVEL 2021-04-23 18:13:04 +10:00
esp_err.c esp_common: move esp_err 2021-02-24 12:16:37 +08:00
esp_system.c esp32: move system api to esp_system 2021-03-31 19:13:03 +08:00
fpga_overrides.c esp_common: other movements 2021-02-24 12:16:37 +08:00
freertos_hooks.c esp_common: move freertos hooks 2021-02-24 12:16:37 +08:00
int_wdt.c esp_common: move task, int wdt 2021-02-24 12:16:37 +08:00
Kconfig gdbstub component 2021-05-11 15:55:39 +03:00
linker.lf system: add option to enable undefined behavior sanitizer (UBSAN) 2021-04-22 23:33:45 +02:00
panic.c Code cleanup. Bugfix after rebase with master. Formating. 2021-05-13 15:03:40 +03:00
README.md esp_system: add notes on timekeeping 2021-03-25 16:09:33 +08:00
sdkconfig.rename esp_common: move configs 2021-02-24 12:16:37 +08:00
stack_check.c log: Remove redundant definition of LOG_LOCAL_LEVEL 2021-04-23 18:13:04 +10:00
startup.c * ets_delay_us(1) has too much overhead; change logic 2021-04-28 16:38:24 +08:00
system_time.c esp32c3: Apply one-liner/small changes for ESP32-C3 2020-12-01 10:58:50 +11:00
task_wdt.c wdt: Updates 2021-03-18 02:31:28 +08:00
ubsan.c system: add option to enable undefined behavior sanitizer (UBSAN) 2021-04-22 23:33:45 +02:00

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.