NRF24L01 pins:
PG0 : CE
PG1 : CSN
Left A4988 pins:
EN(active low) : GND(always enabled)
MS1 : PA5
MS2 : PA7
MS3 : PC6
RST and SLP : PC4 with 10k series resistor
STEP : PC2
DIR : PC0
Right A4988 pins:
DIR : PA0
STEP : PA2
SLP and RST : PA4 with 10k series resistor
MS3 : PA6
MS2 : PC7
MS1 : PC5
EN(active low) : GND(always enabled)
LCD pins:
RST : PL7
CE : PL6
DC : PL5
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