/*LED display test Use shiftregister 7 to control anodes, 1 = output low = segment off Use individual bits of shift registers 0,1,2,3,4,5,6 to control common cathode of individual digits. 1 = output low, common cathode on cathode bits are flipped in pairs: control board: a-b, c-d, e-f, g-dp breakout board: b-a, d-c, f-e, dp-g anodes are 1-1 between boards: a,b,c,d,e,f,g */
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