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RP2040: Allow FreeRTOS to be added to the parent CMake project post initialization of the Pico SDK (#497)

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Co-authored-by: graham sanderson <graham.sanderson@raspeberryi.com>
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Graham Sanderson 2022-06-24 06:52:49 -05:00 • committed by GitHub
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portable/ThirdParty/GCC/RP2040/README.md vendored
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@ -10,16 +10,28 @@ Note that a FreeRTOS SMP version of this port is also available in the FreeRTOS-
## Using this port
Copy [FreeRTOS-Kernel-import.cmake](FreeRTOS-Kernel-import.cmake) into your project, and
add:
You can copy [FreeRTOS-Kernel-import.cmake](FreeRTOS-Kernel-import.cmake) into your project, and
add the following in your `CMakeLists.txt`:
```cmake
import(FreeRTOS_Kernel_import.cmake)
```
below the usual import of `pico_sdk_import.cmake`
This will locate 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.
**NOTE:** If you are using version 1.3.1 or older of the Raspberry Pi Pico SDK then this line must appear before the
`pico_sdk_init()` and will cause FreeRTOS to be included/required in all RP2040 targets in your project. After this SDK
version, you can include the FreeRTOS-Kernel support later in your CMake build (possibly in a subdirectory) and the
FreeRTOS-Kernel support will only apply to those targets which explicitly include FreeRTOS support.
As an alternative to the `import` statement above, you can just add this directory directly via thw following (with
the same placement restrictions related to the Raspberry Pi Pico SDK version above):
```cmake
add_subdirectory(path/to/this/directory FreeRTOS-Kernel)
```
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