Merge branch 'RP2040-Support' of https://github.com/EricSchubert/OpenAstroTracker-Firmware-RP2040 into RP2040-Support

Author: Eric Schubert

platformio.ini

@@ -136,7 +136,8 @@ extends = common_embedded
 platform = https://github.com/maxgerhardt/platform-raspberrypi.git
 board_build.core = earlephilhower
 lib_deps =
-	teemuatlut/TMCStepper @ ^0.7.1
+	;teemuatlut/TMCStepper @ ^0.7.1 ;Placeholder for if/when changes get merged with official repository code
+	https://github.com/EricSchubert/TMCStepper-RP2040_Support.git#rp2040-single-wire-uart ;
 	waspinator/AccelStepper @ ^1.61
 	mikalhart/TinyGPSPlus @ ^1.0.2
 ; TimerInterrupt is AVR-only (uses OCR1A etc.); RP2040 uses hardware/timer.h directly