In order:
	SDA for orientation
	blue [upper left pin TSS, so MISO] MISO verified
	lila [upper right pin TSS, so MOSI] MOSI verified
	grey [below lila; so SCLK] SPI CLK verified
On GPIO-1:
	PC19 33 CS0
	PC20 35 K21 CLK grey
	PC21 37 J21 MOSI lila
	PC22 39 J20 MISO blue