System API ********** .. toctree:: :maxdepth: 1 FreeRTOS <freertos> FreeRTOS Hooks <hooks> Heap Memory Allocation <mem_alloc> Heap Memory Debugging <heap_debug> Interrupt Allocation <intr_alloc> Watchdogs <wdts> Inter-Processor Call <ipc> High Resolution Timer <esp_timer> Logging <log> Application Level Tracing <app_trace> Power Management <power_management> Sleep Modes <sleep_modes> Base MAC address <base_mac_address> Over The Air Updates (OTA) <ota> ESP pthread <esp_pthread> Example code for this API section is provided in :example:`system` directory of ESP-IDF examples.