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esp-idf/components/esp_system
History
Martin Vychodil 60386410ae System: fix RTCFAST section alignment 
This bugfix contains 3 fixes:
1. .rtc_dummy section is removed (not needed for C3)
2. .rtc_text section is padded with 16B for possible CPU prefetch
3. .rtc_text section is aligned to 4B boundary to comply with PMS Memprot requirements
2021-12-22 21:58:20 +01:00
..
include WDT: Add support for XTAL32K Watchdog timer 2021-09-02 09:09:00 +08:00
ld System: fix RTCFAST section alignment 2021-12-22 21:58:20 +01:00
port System/Security: wrong check of the Memprot feature in esp_restart()/panic_restart() 2021-10-29 15:02:17 +02:00
test ci: fix "can set sleep wake stub from stack in RTC RAM" test case failure 2021-12-09 13:59:30 +08:00
test_eh_frame_parser espsystem: Rearchitecture and fix eh_frame_parser bugs 2021-07-15 12:47:51 +08:00
app.lf esp32: move common fragment definitions 2021-03-31 19:17:33 +08:00
CMakeLists.txt WDT: Add support for XTAL32K Watchdog timer 2021-09-02 09:09:00 +08:00
component.mk esp_system: fix high level interrupt handler not linked for GNU Make 2021-10-26 11:26:45 +02:00
crosscore_int.c esp32h2: update esp_system and esp_hw_support to support esp32h2 2021-07-01 19:53:11 +08:00
dbg_stubs.c gcov: add stub table size entry 2021-08-20 15:00:55 +08:00
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_system.c System/Security: wrong check of the Memprot feature in esp_restart()/panic_restart() 2021-10-29 15:02:17 +02:00
fpga_overrides.c esp32: App can boot on FPGA image 2021-07-16 10:50:06 +10:00
freertos_hooks.c esp_common: move freertos hooks 2021-02-24 12:16:37 +08:00
int_wdt.c components/bt: add config option to choose Bluetooth intterupt level. 2021-09-09 11:29:17 +08:00
Kconfig vfs_usb_serial: set secondary selection for making usb port can output under default menu 2021-11-17 19:54:15 +08:00
linker.lf system: add option to enable undefined behavior sanitizer (UBSAN) 2021-04-22 23:33:45 +02:00
Makefile.projbuild esp32: move app linker scripts 2021-07-16 20:14:27 +08:00
panic.c esp_system: make the abort operation compatible with clang 2021-09-16 11:07:54 +02:00
README.md esp_system: add notes on timekeeping 2021-03-25 16:09:33 +08:00
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 startup: init timer before calling esp_apptrace_tmo_init 2021-11-25 23:58:36 +01:00
system_time.c esp32h2: update esp_system and esp_hw_support to support esp32h2 2021-07-01 19:53:11 +08:00
task_wdt.c twdt: Fix timeout decimal literals to prevent uint32_t overflow 2021-10-15 16:07:27 +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.