System API¶
- FreeRTOS
 - FreeRTOS Additions
 - Heap Memory Allocation
 - Heap Memory Debugging
 - Himem (large external SPI RAM) API
 - Interrupt Allocation
 - Watchdogs
 - eFuse Manager
 - Inter-Processor Call
 - High Resolution Timer
 - Logging
 - Event Loop Library
 - Application Level Tracing
 - Power Management
 - Sleep Modes
 - Over The Air Updates (OTA)
 - ESP HTTPS OTA
 - ESP pthread
 - Error Codes and Helper Functions
 - App image format
 - Miscellaneous System APIs
 
Code examples for this API section are provided in the system directory of ESP-IDF examples.