Pico-blink-sdk support for RP2350 (#58)

Modify CMakeLists.txt to automatically adjust for target architecture 
changes. Guide the swiftc compiler to use the appropriate target based 
on the PICO_PLATFORM CMake variable, which defaults to PICO_BOARD if 
not explicitly set.

Add a target check for RISC-V to support compilation on RP2350 hardware 
in RISC-V mode. Compilation currently fails due to pico-sdk errors, 
similar to issues encountered on RP2040 with the new SDK versions.

Author: iCMDdev

README.md

@@ -37,9 +37,9 @@ Each example in this repository contains build and deployment instructions, howe
 | [stm32-neopixel](./stm32-neopixel) | STM32F746G-DISCO | None | Control NeoPixel LEDs using SPI. | <img width="300" src="https://github.com/apple/swift-embedded-examples/assets/1186214/9c5d8f74-f8aa-4632-831e-212a3e35e75a"> |
 | [stm32-uart-echo](./stm32-uart-echo) | STM32F746G-DISCO | None | Echo user input using UART. | <img width="300" src="https://github.com/apple/swift-embedded-examples/assets/1186214/97d3c465-9a07-4b86-9654-0c2aaaa43b3d">|
 | [pico-blink](./pico-blink) | Raspberry Pi Pico | None  | Blink an LED repeatedly. | <img width="300" src="https://github.com/apple/swift-embedded-examples/assets/1186214/f2c45c18-f9a4-48b4-a941-1298ecc942cb"> |
-| [pico-blink-sdk](./pico-blink-sdk) | Raspberry Pi Pico | Pico SDK | Blink an LED repeatedly with Swift & the Pico SDK. | <img width="300" src="https://github.com/apple/swift-embedded-examples/assets/1186214/f2c45c18-f9a4-48b4-a941-1298ecc942cb"> |
+| [pico-blink-sdk](./pico-blink-sdk) | Raspberry Pi Pico, Pico 2 | Pico SDK | Blink an LED repeatedly with Swift & the Pico SDK. | <img width="300" src="https://github.com/apple/swift-embedded-examples/assets/1186214/f2c45c18-f9a4-48b4-a941-1298ecc942cb"> |
 | [pico-w-blink-sdk](./pico-w-blink-sdk) | Raspberry Pi Pico W | Pico SDK | Blink an LED to signal 'SOS' in Morse code repeatedly with Swift & the Pico SDK. | <img width="300" src="https://github.com/apple/swift-embedded-examples/assets/26223064/a4949a2e-1887-4325-8f5f-a681963c93d7"> |
-| [pico2-neopixel](./pico2-neopixel) | Raspberry Pi Pico2 | None | Control Neopixel LEDs using the RP2350 PIO. | <img width="300" src="pico2-neopixel/assets/images/example.jpg"> |
+| [pico2-neopixel](./pico2-neopixel) | Raspberry Pi Pico 2 | None | Control Neopixel LEDs using the RP2350 PIO. | <img width="300" src="pico2-neopixel/assets/images/example.jpg"> |
 | [nrfx-blink-sdk](./nrfx-blink-sdk) | nRF52840-DK | Zephyr SDK | Blink an LED repeatedly with Swift & Zephyr. | <img width="300" src="https://github.com/apple/swift-embedded-examples/assets/1186214/ae3ff153-dd33-4460-8a08-4eac442bf7b0"> |
 | [esp32-led-strip-sdk](./esp32-led-strip-sdk) | ESP32-C6-DevKitC-1 | ESP-IDF SDK | Control NeoPixel LEDs with Swift & the ESP-IDF. | <img width="300" src="https://github.com/apple/swift-embedded-examples/assets/1186214/15f8a3e0-953e-426d-ad2d-3902baf859be"> |
 | [esp32-led-blink-sdk](./esp32-led-blink-sdk) | ESP32-C6-Bug | ESP-IDF SDK | Blink an LED repeatedly with Swift & the ESP-IDF. | <img width="300" src="esp32-led-blink-sdk/assets/images/ledon.jpg"> |

pico-blink-sdk/CMakeLists.txt

@@ -10,12 +10,24 @@ else()
 execute_process(COMMAND which swiftc OUTPUT_VARIABLE SWIFTC OUTPUT_STRIP_TRAILING_WHITESPACE)
 endif()
 
+
+set(SWIFT_TARGET "armv6m-none-none-eabi") # default for rp2040
+
+if(PICO_PLATFORM STREQUAL "rp2350-arm-s")
+    message(STATUS "PICO_PLATFORM is set to rp2350-arm-s, using armv7em")
+    set(SWIFT_TARGET "armv7em-none-none-eabi")
+elseif(PICO_PLATFORM STREQUAL "rp2350-riscv")
+    # Untested, gives PICO-SDK errors when building
+    message(WARNING "PICO_PLATFORM is set to rp2350-riscv, using riscv32 (untested). It is recommended to use rp2350-arm-s.")
+    set(SWIFT_TARGET "riscv32-none-none-eabi")
+endif()
+
 add_executable(swift-blinky)
 add_custom_command(
     OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/_swiftcode.o
     COMMAND
         ${SWIFTC}
-        -target armv6m-none-none-eabi -Xcc -mfloat-abi=soft -Xcc -fshort-enums
+        -target ${SWIFT_TARGET} -Xcc -mfloat-abi=soft -Xcc -fshort-enums
         -Xfrontend -function-sections -enable-experimental-feature Embedded -wmo -parse-as-library
         $$\( echo '$<TARGET_PROPERTY:swift-blinky,INCLUDE_DIRECTORIES>' | tr '\;' '\\n' | sed -e 's/\\\(.*\\\)/-Xcc -I\\1/g' \)
         $$\( echo '${CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES}'             | tr ' '  '\\n' | sed -e 's/\\\(.*\\\)/-Xcc -I\\1/g' \)

pico-blink-sdk/README.md

@@ -24,7 +24,7 @@ This example demonstrates how to integrate with the Pico SDK which is using CMak
 ``` console
 $ cd pico-blink-sdk
 $ export TOOLCHAINS='<toolchain-identifier>'
-$ export PICO_BOARD=pico
+$ export PICO_BOARD='<board-name>' # Examples: pico, pico2
 $ export PICO_SDK_PATH='<path-to-your-pico-sdk>'
 $ export PICO_TOOLCHAIN_PATH='<path-to-the-arm-toolchain>' # A default `brew` install will be located at `/Applications/ArmGNUToolchain/[version]/arm-none-eabi`
 $ cmake -B build -G Ninja .