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esp-idf/components/esp_system
History
Darian Leung a45fcce631 newlib: Add workaround for printf functions using 32-bit time_t on first call 
sizeof(time_t) was previously switched from 4 to 8, ROM functions that use
time_t or dependent types (such as "struct stat") are no longer called due as
they still treat sizeof(time_t) as 4 (see commit
24c20d18).

However, there is a ROM callpath that was left out. If putchar is the first
stdio print related call, the call path will result in cantwrite() ->
__swsetup_r() -> __smakebuf_r() -> __swhatbuf_r() using the ROM "struct stat"
(where sizeof(time_t)==4).

Instead of removing all printf related ROM newlib functions (which will result
in increased binary size), this commit adds a workaround to setup the stdio
files before any print related calls occur.

This results in cantwrite() always returning false, thus the callpath described
above never being reached.

Closes https://github.com/espressif/esp-idf/issues/9269
2022-08-22 11:56:51 +08:00
..
include esp_system: ipc_isr does not use its own initialization task, it is done from ipc_task() 2022-02-18 12:36:05 +08:00
ld (Xtensa) Build: add .xt.prop and .xt.lit to the compiled ELF file 2022-08-17 14:58:36 +08:00
port system: moved placement of disable rom log efuse in startup flow 2022-08-10 12:17:51 +08:00
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_apps ulp-riscv: add support for using ADC as well as an example show-casing it. 2022-08-09 09:21:15 +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 debug_stubs: Refactor and add support for RISCV 2022-02-08 22:24:54 +03:00
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
debug_stubs.c debug_stubs: Refactor and add support for RISCV 2022-02-08 22:24:54 +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_system.c System/Security: Memprot API unified (ESP32C3,ESP32S3) 2022-01-27 12:40:27 +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 components/bt: add config option to choose Bluetooth intterupt level. 2021-09-09 11:29:17 +08:00
Kconfig esptool_py: Update to support ESP32-S3 USB OTG compressed flashing with stub 2022-04-14 12:28:28 +02:00
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 newlib: Add workaround for printf functions using 32-bit time_t on first call 2022-08-22 11:56:51 +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.