Useful External Documentation - FujiNetWIFI/fujinet-firmware GitHub Wiki
PlatformIO General Documentation
FujiNet uses the PlatformIO cross-platform development environment to ease firmware development. PlatformIO is currently built on libraries, tools, and extensions to Microsoft Visual Studio Code.
PlatformIO General Documentation
ESP-IDF Documentation
FujiNet is built on Espressif's "IoT Development Framework", or ESP-IDF for brevity. Note that the documentation web site defaults to the latest available version of the framework, and this is sometimes a pre-release version not yet available to PlatformIO users. Make sure you choose the "latest stable" version from the menu hidden at the bottom-left of the page. The "latest prerelease" version is usually chosen by default.
PlatformIO ESP-IDF Guidelines
PlatformIO provides specific documentation and notes on each of the platforms it targets, including ESP-IDF. These notes are useful in understanding the features and tools specific to ESP-IDF development on PlatformIO:
PlatformIO ESP-IDF Framework Notes
FreeRTOS Reference
ESP-IDF currently uses a build (or "port") of the FreeRTOS 8.2.0 multitasking RTOS for its kernel. This port includes some additional functionality - partly from backports of FreeRTOS 9.0 features and partly from ESP-specific features.
Here's a PDF of the FreeRTOS 8.2.3 reference manual: FreeRTOS 8.2.3 Reference Manual
Mastering the FreeRTOS Kernel (pre v9.0.0 version): Mastering the FreeRTOS Real Time Kernel
The following is a link to FreeRTOS 9.0.0 documentation. The majority of it is applicable to the FreeRTOS 8.2.0 used in ESP-IDF: FreeRTOS 9 Documentation
ESP-IDF Changes to FreeRTOS
"Various features specific to ESP-IDF FreeRTOS have been added. The features are as follows:"
"The ESP-IDF FreeRTOS is a modified version of vanilla FreeRTOS which supports symmetric multiprocessing (SMP). ESP-IDF FreeRTOS is based on the Xtensa port of FreeRTOS v8.2.0. This guide outlines the major differences between vanilla FreeRTOS and ESP-IDF FreeRTOS."
GNU Compiler Collection 8.2.0
ESP-IDF currently uses a GCC 8.2-based toolchain to build ESP32 binaries. This version of GCC supports the "C11" version of the C language and "C++14".
Espressif Bluetooth Documentation
Details on Espressif's Bluetooth implemenation.
Espressif Bluetooth Documentation
Altirra Hardware Reference Manual
Avery Lee's (phaeron on AtariAge) invaluable documentation on practically every aspect of how Atari 8-bit machines work.