Raspberry Pi Pico target (with sparkfun lora hat) does compile but needs further work.

Also contains a small fix to make PRIVATE_HW targets build again for nRF52 architectures

platformio.ini

@@ -92,7 +92,7 @@ lib_deps =
 extends = arduino_base
 platform = espressif32@3.5.0
 build_src_filter = 
-  ${arduino_base.build_src_filter} -<nrf52/> -<stm32wl>
+  ${arduino_base.build_src_filter} -<nrf52/> -<stm32wl> -<rp2040>
 upload_speed = 115200
 debug_init_break = tbreak setup
 
@@ -144,7 +144,7 @@ build_flags =
   ${arduino_base.build_flags} -Wno-unused-variable 
   -Isrc/nrf52
 build_src_filter = 
-  ${arduino_base.build_src_filter} -<esp32/> -<stm32wl> -<nimble/> -<mesh/wifi/> -<mesh/http/> -<modules/esp32> -<mqtt/>
+  ${arduino_base.build_src_filter} -<esp32/> -<stm32wl> -<nimble/> -<mesh/wifi/> -<mesh/http/> -<modules/esp32> -<mqtt/> -<rp2040>
 lib_ignore =
   BluetoothOTA
 
@@ -165,3 +165,23 @@ board = nrf52840_dk
 [env:feather_nrf52832]
 extends = nrf52_base
 board = adafruit_feather_nrf52832
+
+; Common settings for rp2040 Processor based targets
+[rp2040_base]
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git
+extends = arduino_base
+board_build.core = earlephilhower
+board_build.filesystem_size = 0.5m
+build_flags = 
+  ${arduino_base.build_flags} -Wno-unused-variable 
+  -Isrc/rp2040
+  -D__PLAT_RP2040__
+#  -D _POSIX_THREADS
+build_src_filter = 
+  ${arduino_base.build_src_filter} -<esp32/> -<nimble/> -<mesh/wifi/> -<mesh/http/> -<modules/esp32> -<mqtt/> -<nrf52/> -<stm32wl> -<../.pio/libdeps/pico/tiny-AES-c/test.*>
+lib_ignore =
+  BluetoothOTA
+lib_deps =
+  ${arduino_base.lib_deps}
+  ${environmental_base.lib_deps}
+  https://github.com/kokke/tiny-AES-c.git