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esp-idf/components/esp_system
Historia
Darian Leung 3336b057d6 xtensa: Move saving of a0 register to match upstream 
Upstream xtensa exception handling will save PS, PC, and a0 registers
together when saving a minimal context. This commit ppdates the xtensa
exception handling to match upstream behavior.
 		2022-02-03 17:08:14 +08:00
..
include esp8684: rename target to esp32c2 2022-01-19 11:08:57 +08:00
ld ulp: refactor ulp component 2022-01-27 11:54:42 +05:30
port xtensa: Move saving of a0 register to match upstream 2022-02-03 17:08:14 +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 espsystem: Rearchitecture and fix eh_frame_parser bugs 2021-07-15 12:47:51 +08:00
CMakeLists.txt esp8684: rename target to esp32c2 2022-01-19 11:08:57 +08:00
Kconfig esp8684: rename target to esp32c2 2022-01-19 11:08:57 +08:00
README.md esp_system: add notes on timekeeping 2021-03-25 16:09:33 +08:00
app.lf esp32: move common fragment definitions 2021-03-31 19:17:33 +08:00
crosscore_int.c esp8684: rename target to esp32c2 2022-01-19 11:08:57 +08:00
debug_stubs.c debug_stubs: Refactor and add support for RISCV 2021-11-04 01:33:24 +03:00
eh_frame_parser.c espsystem: Rearchitecture and fix eh_frame_parser bugs 2021-07-15 12:47:51 +08:00
esp_err.c esp_common: move esp_err 2021-02-24 12:16:37 +08:00
esp_ipc.c esp_system: ipc_isr does not use its own initialization task, it is done from ipc_task() 2022-01-13 21:28:08 +08:00
esp_system.c esp8684: rename target to esp32c2 2022-01-19 11:08:57 +08:00
fpga_overrides.c ESP8684: add freertos, hal, esp_system support 2021-11-06 17:33:44 +08:00
freertos_hooks.c esp_common: move freertos hooks 2021-02-24 12:16:37 +08:00
int_wdt.c esp8684: rename target to esp32c2 2022-01-19 11:08:57 +08:00
linker.lf system: add option to enable undefined behavior sanitizer (UBSAN) 2021-04-22 23:33:45 +02:00
panic.c esp_hw_support: Removed deprecated CPU util functions 2021-12-28 16:58:37 +05:30
sdkconfig.rename esp32h2: update esp_system and esp_hw_support to support esp32h2 2021-07-01 19:53:11 +08:00
stack_check.c log: Remove redundant definition of LOG_LOCAL_LEVEL 2021-04-23 18:13:04 +10:00
startup.c esp8684: rename target to esp32c2 2022-01-19 11:08:57 +08:00
system_time.c esp8684: rename target to esp32c2 2022-01-19 11:08:57 +08:00
task_wdt.c esp8684: rename target to esp32c2 2022-01-19 11:08:57 +08:00
ubsan.c system: add option to enable undefined behavior sanitizer (UBSAN) 2021-04-22 23:33:45 +02:00
xt_wdt.c WDT: Add support for XTAL32K Watchdog timer 2021-09-02 09:09:00 +08:00

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.