esp-idf/components/esp_system
Cao Sen Miao 3a4db97cec spi_flash: move patch files to common rom patch folder 2021-12-30 14:05:12 +08:00
..
include docs: update programming guide for esp32s3 chip independent system chapters 2021-11-23 12:48:10 +05:30
ld System: fix RTCFAST section alignment 2021-12-23 19:58:39 +08:00
port spi_flash: move patch files to common rom patch folder 2021-12-30 14:05:12 +08:00
test esp_clk: refactor target/clk.h to private/esp_clk.h 2021-11-26 14:56:30 +08:00
test_eh_frame_parser
CMakeLists.txt freertos,esp_system: make dependencies on some components optional 2021-12-13 18:39:49 +01:00
Kconfig esp32h2: update reg and struct for beta2 2021-11-24 12:34:17 +08:00
README.md
app.lf
crosscore_int.c
debug_stubs.c
eh_frame_parser.c
esp_err.c
esp_ipc.c esp_ipc: Update documentation and API descriptions 2021-11-18 21:34:50 +08:00
esp_system.c esp_hw_support: Removed deprecated CPU util functions 2021-12-28 16:58:37 +05:30
fpga_overrides.c
freertos_hooks.c
int_wdt.c global: make periph enable/disable APIs private 2021-11-08 10:37:47 +08:00
linker.lf
panic.c esp_hw_support: Removed deprecated CPU util functions 2021-12-28 16:58:37 +05:30
sdkconfig.rename
stack_check.c
startup.c freertos,esp_system: make dependencies on some components optional 2021-12-13 18:39:49 +01:00
system_time.c
task_wdt.c global: make periph enable/disable APIs private 2021-11-08 10:37:47 +08:00
ubsan.c
xt_wdt.c

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.