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Add RP2040 support (#341)

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* Add RP2040 support

* remove spurious tab/spaces comments

* add .cmake to ignored kernel checks

* Apply suggestions from code review

Co-authored-by: Paul Bartell <paul.bartell@gmail.com>

* license and end of file newline fixes

* Rename LICENSE.TXT to LICENSE.md

Co-authored-by: Paul Bartell <paul.bartell@gmail.com>
Co-authored-by: Gaurav-Aggarwal-AWS <33462878+aggarg@users.noreply.github.com>
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Graham Sanderson 2021-06-30 15:20:54 -05:00 • committed by GitHub
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## Overview
This directory provides a FreeRTOS-Kernel port that can be used with the Raspberry Pi Pico SDK. It supports:
* Simple CMake INTERFACE libraries, to provide the FreeRTOS-Kernel and also the individual allocator types, without copying code into the user's project.
* Running the FreeRTOS-Kernel and tasks on either core 0 or core 1
* Use of SDK synchronization primitives (such as mutexes, semaphores, queues from pico_sync) between FreeRTOS tasks and code executing on the other core, or in IRQ handlers.
Note that a FreeRTOS SMP version of this port is also available in the FreeRTOS-Kernel smp branch, which additionally supports utilizing both RP2040 CPU cores for FreeRTOS tasks simultaneously.
## Using this port
Copy [FreeRTOS-Kernel-import.cmake](FreeRTOS-Kernel-import.cmake) into your project, and
add:
```cmake
import(FreeRTOS_Kernel_import.cmake)
```
below the usual import of `pico_sdk_import.cmake`
This will find the FreeRTOS kernel if it is a direct sub-module of your project, or if you provide the `FREERTOS_KERNEL_PATH` variable in your environment or via `-DFREERTOS_KERNEL_PATH=/path/to/FreeRTOS-Kernel` on the CMake command line.
## Advanced Configuration
Some additional `config` options are defined [here](include/rp2040_config.h) which control some low level implementation details.
## Known Limitations
- Tickless idle has not currently been tested, and is likely non-functional