Stick to older framework for jpiat/PioSPI compatibility (#114)

Author: Apehaenger

Firmware/LowLevel/platformio.ini

@@ -17,6 +17,13 @@ default_src_filter = +<*>
 platform = https://github.com/maxgerhardt/platform-raspberrypi.git
 board = pico
 framework = arduino
+
+; Latest (known) version which compiles well with jpiat/PioSPI.
+; framework-arduinopico >= 4.4.3 will have a (PIO-Assembly driven) SoftwareSPI implementation which would make jpiat/PioSPI needless,
+; but I currently have no mainboard with LSM6DSO here for testing. So stick to the last working version till someone can switch & test it.
+platform_packages =
+    framework-arduinopico @ https://github.com/earlephilhower/arduino-pico.git#4.3.0
+
 board_build.core = earlephilhower
 board_build.filesystem_size = 64k