Refactor some SPI transactions #490

Job	Run time
build (adafruit_feather_rp2040) / build	1m 46s
build (adafruit_itsybitsy_rp2040) / build	1m 31s
build (adafruit_qtpy_rp2040) / build	1m 19s
build (arduino_nano_rp2040_connect) / build	2m 18s
build (pico) / build	1m 37s
build (pimoroni_pga2040) / build	1m 22s
build (pimoroni_picolipo_16mb) / build	1m 23s
build (pimoroni_picolipo_4mb) / build	1m 19s
build (pimoroni_tiny2040) / build	1m 19s
build (sparkfun_micromod) / build	1m 30s
build (sparkfun_promicro) / build	1m 33s
build (sparkfun_thingplus) / build	1m 44s
	18m 41s

Provide feedback