Pin Usage
=========

mk20dx256vlh7

 ----
|Keys|
 ----

* Strobe (Columns)

TODO

* Sense (Rows)

TODO


 -----
|Clock|
 -----

PTA18 <-> PTA19


 ---
|I2C|
 ---

* Main - Connect to all ISSI Chips - Also break out header for debugging

PTB0 - SCL0 (add header pin, label as SCL0)
PTB1 - SDA0 (add header pin, label as SDA0)

* Reserved for I2C usage

PTC10 - SCL1 (Reserved, can use as GPIO)
PTC11 - SDA1 (Reserved, can use as GPIO)

* ISSI Control (enough pins for 3 chips reserved)

PTB17 - INTB Chip 1
PTB18 - INTB Chip 2 (Reserved, can use as GPIO)
PTB19 - INTB Chip 3 (Reserved, can use as GPIO)

PTB16 - SDB (tied to all Chips, hardware shutdown)


 ---
|PWM|
 ---

NHD-C12832A1Z-FS(RGB)-FBW-3V

PTC1 - K(R)
PTC2 - K(G)
PTC3 - K(B)


 ---
|SPI|
 ---

NHD-C12832A1Z-FS(RGB)-FBW-3V

PTC4 - CS1B    - SS1
PTC5 - SCL     - SCLK
PTC6 - SDA(SI) - MOSI
PTC7 - A0  (Not SPI, used for display)
PTC8 - RST (Not SPI, used for display)


 ---
|DAC|
 ---

DAC0 (N/C)


 ----
|UART|
 ----

* Comm - For bi-directional communication between halves

PTA1 - RX0 (Master Side)
PTA2 - TX0 (Master Side)

PTE0 - TX1 (Slave Side)
PTE1 - RX1 (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
PTB2
PTB3
PTB16
PTB17
PTB18
PTB19
PTC0
PTC9
PTC10
PTC11
PTD0
PTD1
PTD4
PTD5
PTD6
PTD7

* Analog

TODO