add rp2040 build environment to knx-demo example for both example project and ci

examples/knx-demo/platformio-ci.ini

@@ -79,3 +79,20 @@ build_flags =
   -DMASK_VERSION=0x07B0
   -Wno-unknown-pragmas
   -DUSE_DATASECURE
+
+;--- RP2040 -----------------------------------------------
+[env:rp2040]
+framework = arduino
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git#182d833
+platform_packages = framework-arduinopico @ https://github.com/earlephilhower/arduino-pico/releases/download/3.6.2/rp2040-3.6.2.zip
+board = rpipico
+board_build.core = earlephilhower
+
+lib_deps =
+  knx
+
+build_flags =
+  -DMASK_VERSION=0x07B0
+  -DKNX_FLASH_SIZE=4096
+  -D PIO_FRAMEWORK_ARDUINO_ENABLE_RTTI
+  -Wno-unknown-pragmas

examples/knx-demo/platformio.ini

@@ -146,3 +146,26 @@ build_flags =
   -Wno-unknown-pragmas
 
 extra_scripts = ../scripts/stm32rdu.py
+
+
+;--- RP2040 -----------------------------------------------
+[env:rp2040]
+framework = arduino
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git#182d833
+platform_packages = framework-arduinopico @ https://github.com/earlephilhower/arduino-pico/releases/download/3.6.2/rp2040-3.6.2.zip
+board = rpipico
+board_build.core = earlephilhower
+; We consider that the this projects is opened within its project directory
+; while working with VS Code.
+
+
+lib_deps =
+  knx=file://../../../knx
+
+lib_ldf_mode = deep+
+
+build_flags =
+  -DMASK_VERSION=0x07B0
+  -DKNX_FLASH_SIZE=4096
+  -D PIO_FRAMEWORK_ARDUINO_ENABLE_RTTI
+  -Wno-unknown-pragmas