Add build env for xcvr

platformio.ini

@@ -1,20 +1,11 @@
 ; PlatformIO Project Configuration File https://docs.platformio.org/page/projectconf.html
-
-[env:genericSTM32F103C8]
-platform = ststm32
-board = genericSTM32F103C8
-board_build.mcu = stm32f103c8t6
-board_build.core = maple
+[env]
 framework = arduino
 lib_deps =
     greiman/SdFat @ ^2.0.6
 upload_protocol = stlink
 ; Different gcc versions produce much different binaries in terms of speed.
 platform_packages = platformio/toolchain-gccarmnoneeabi@1.90301.200702
-
-build_unflags = 
-    -Os
-    -DARDUINO_ARCH_STM32F1
 build_flags = 
     -w
     -DARDUINO_GENERIC_STM32F103C
@@ -23,11 +14,21 @@ build_flags =
     -DARDUINO_ARCH_STM32
     -DDEBUG_LEVEL=DEBUG_NONE
     -O2
-
-; Work around for clones.
-; https://community.platformio.org/t/cannot-upload-to-stm32-bluepill-board-over-stlink-v2/3492/25
+build_unflags = 
+    -Os
+    -DARDUINO_ARCH_STM32F1
 upload_flags = -c set CPUTAPID 0
 
+[env:STM32F103C8]
+platform = ststm32
+board = genericSTM32F103C8
+board_build.mcu = stm32f103c8t6
+board_build.core = maple
+
+[env:STM32F103C8-XCVR]
+extends = env:STM32F103C8
+build_flags = ${env.build_flags} -DXCVR
+
 ; [env:debug]
 ; build_type = debug
 ; debug_tool = stlink