esp-idf/components/esp_system
morris 2058e89448 Merge branch 'feature/fpga_bootloader' into 'master'
Boot ESP32 & ESP32-S2 apps on FPGA

See merge request espressif/esp-idf!8270
2021-07-18 08:06:38 +00:00
..
include espsystem: Rearchitecture and fix eh_frame_parser bugs 2021-07-15 12:47:51 +08:00
ld esp32h2: Move from target component to esp_hw_support (new structure) 2021-07-16 20:14:27 +08:00
port Merge branch 'feature/fpga_bootloader' into 'master' 2021-07-18 08:06:38 +00:00
test esp32: move remaining tests 2021-07-16 20:14:27 +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 esp32: move app linker scripts 2021-07-16 20:14:27 +08:00
component.mk esp32: move app linker scripts 2021-07-16 20:14:27 +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 log: Remove redundant definition of LOG_LOCAL_LEVEL 2021-04-23 18:13:04 +10:00
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 esp32h2: update esp_system and esp_hw_support to support esp32h2 2021-07-01 19:53:11 +08:00
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 esp_common: move task, int wdt 2021-02-24 12:16:37 +08:00
Kconfig espsystem: Rearchitecture and fix eh_frame_parser bugs 2021-07-15 12:47:51 +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 Merge branch 'bugfix/panic_handler_disable_wdts_early' into 'master' 2021-06-29 23:48:40 +00:00
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 ldgen: Remove some remaining references to TARGET.project.ld.in 2021-07-16 20:14:27 +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 esp32h2: update esp_system and esp_hw_support to support esp32h2 2021-07-01 19:53:11 +08:00
ubsan.c system: add option to enable undefined behavior sanitizer (UBSAN) 2021-04-22 23:33:45 +02:00

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.