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3.2 40 pins GPIO
When Manta series motherboard work with CB1, 40 pins GPIO is a custom IO
arrangement, as shown in the figure below, Pin 7 is CB1's "PC7", and Pin 11 is CB1's
"PC14". The GPIO number of CB1 corresponds to (Px–PA)*32 + Pin
For example:
PC7 = (PC–PA)*32 + 7 = 2 * 32 + 7 = 71
PH10 = (PH–PA)*32 + 10 = 7 * 32 + 10 = 234
PC7 is numbered in Klipper as pin: host: gpio71, PH10 as pin: host: gpio234
Note: The logic voltage of PC ports in V2.1 version (PC6, PC7, PC8, PC9, PC10,
PC11, PC12, PC13, PC14, PC15): 1.8V;
The logic voltage of PC ports in V2.2 version (PC6, PC7, PC8, PC9, PC10, PC11,
PC12, PC13, PC14, PC15): 3.3V.
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