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esp-idf/components/esp_system
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Armando 2d44dc1eed mmu: driver framework, for vaddr maintenance 
This commit gives basic mmu driver framework. Now it is able to maintain
mmu virtual address usage on esp32, esp32s2 and esp32s3. Usage to
external virtual address should rely on mmu functions to know which
address range is available, instead of hardcoded.

This commit also improves psram memory that is added to the heap
allocator. Now it's added to the heap, according to the memory
alignment.

Closes https://github.com/espressif/esp-idf/issues/8295
 		2022-08-26 17:59:06 +08:00
..
include
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ld mmu: driver framework, for vaddr maintenance 2022-08-26 17:59:06 +08:00
port
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test
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test_apps
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test_eh_frame_parser
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.build-test-rules.yml
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CMakeLists.txt
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Kconfig
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README.md
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app.lf
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check_system_init_priorities.py
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crosscore_int.c
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debug_stubs.c
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eh_frame_parser.c
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esp_err.c
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esp_ipc.c
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esp_system.c
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fpga_overrides.c
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freertos_hooks.c
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int_wdt.c
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linker.lf
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panic.c
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sdkconfig.rename
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sdkconfig.rename.esp32
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sdkconfig.rename.esp32c3
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sdkconfig.rename.esp32h2
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sdkconfig.rename.esp32s2
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sdkconfig.rename.esp32s3
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stack_check.c
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startup.c newlib: Add workaround for printf functions using 32-bit time_t on first call 2022-08-21 15:27:50 +08:00
system_init_fn.txt
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system_time.c
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task_wdt.c
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ubsan.c
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xt_wdt.c
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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.