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61820f5b30
esp-idf/components/esp_system
History
Mahavir Jain 61820f5b30 cpu_start: let individual core clear its interrupt matrix 
There was race condition where interrupt entries set by APP cpu core
could have been cleared during PRO cpu startup.

This was observed while setting up "cache access error" interrupt in
SMP mode for ESP32-S3.

This fix allows to NOT modify or clear any entries set by other core
(APP or PRO) and thus avoiding any race conditions during startup code.
2021-10-20 15:16:25 +05:30
..
include WDT: Add support for XTAL32K Watchdog timer 2021-09-02 09:09:00 +08:00
ld deep sleep: add deep sleep support for esp32s3 2021-10-20 11:36:20 +08:00
port cpu_start: let individual core clear its interrupt matrix 2021-10-20 15:16:25 +05:30
test ci: replacing old header with new SPDX header style 2021-10-20 11:36:23 +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: create ld template to abstract few common settings 2021-09-02 16:13:17 +08:00
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 esp_system: Adds sync of FRC & RTC counters in esp_restart 2021-07-21 10:23:24 +05:00
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 deep sleep: fix some rtc fast memory definition errors in esp32s3 2021-10-19 21:47:27 +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 light sleep: add software workaround for esp32s3 gpio reset issue 2021-10-20 11:36:22 +08:00
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.