2d44dc1eed
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 |
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|---|---|---|
| .. | ||
| include | ||
| ld | ||
| port | ||
| test | ||
| test_apps | ||
| test_eh_frame_parser | ||
| .build-test-rules.yml | ||
| CMakeLists.txt | ||
| Kconfig | ||
| README.md | ||
| app.lf | ||
| check_system_init_priorities.py | ||
| crosscore_int.c | ||
| debug_stubs.c | ||
| eh_frame_parser.c | ||
| esp_err.c | ||
| esp_ipc.c | ||
| esp_system.c | ||
| fpga_overrides.c | ||
| freertos_hooks.c | ||
| int_wdt.c | ||
| linker.lf | ||
| panic.c | ||
| sdkconfig.rename | ||
| sdkconfig.rename.esp32 | ||
| sdkconfig.rename.esp32c3 | ||
| sdkconfig.rename.esp32h2 | ||
| sdkconfig.rename.esp32s2 | ||
| sdkconfig.rename.esp32s3 | ||
| stack_check.c | ||
| startup.c | ||
| system_init_fn.txt | ||
| system_time.c | ||
| task_wdt.c | ||
| ubsan.c | ||
| xt_wdt.c | ||
README.md
System Notes
Timekeeping
The following are the timekeeping mechanisms available and their differences:
- 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.
esp_timertime (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.
newlibtime (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.
- RTC time (
esp_rtc_get_time_us)
Time read from RTC timer.