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controller/Scan/ICPad/pinout

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Pin Usage
=========
mk20dx256vlh7
----
|Keys|
----
* Strobe (Columns)
PTB2
PTB3
PTB18
PTB19
PTC0
PTC8
PTC9
PTC10
PTC11
* Sense (Rows)
PTD0
PTD1
PTD4
PTD5
PTD6
PTD7
PTC1
PTC2
-----
|Clock|
-----
PTA18 <-> PTA19
---
|I2C|
---
* IS31FL3731C
PTB0 - SCL0 (add header pin, label as SCL0)
PTB1 - SDA0 (add header pin, label as SDA0)
PTB17 - INTB Chip 1
PTB16 - SDB (tied to all Chips, hardware shutdown)
---
|DAC|
---
DAC0 (N/C)
----
|UART|
----
* Comm - For bi-directional communication between halves
PTA1 - RX0 (Master Side)
PTA2 - TX0 (Master Side)
PTE1 - RX1 (Slave Side)
PTE0 - TX1 (Slave Side)
PTD2 - RX2 (UART Debug Header)
PTD3 - TX2 (UART Debug Header)
-----
|Debug|
-----
* SWD - (Main reflash header)
PTA0 (Pull-down)
PTA3 (Pull-up)
* LEDs
PTA5 (LED only for PCB, not Teensy)
* UARTs
PTD2 - RX2 (UART Debug Header, label as RX2)
PTD3 - TX2 (UART Debug Header, label as TX2)
------
|Unused|
------
* GPIO
PTA4
PTA12
PTA13
PTC3
PTC4
PTC5
PTC6
PTC7
* Analog
TODO