/* Copyright 2017-2019 Nikolaus Wittenstein <nikolaus.wittenstein@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* This a shortcut to help you visually see your layout.
* The first section contains all of the arguements; the second converts the arguments into a two-dimensional array.
*/
/* Each code is three letters
* l or r - left or right hand
* p, r, m, i, t - pinky, ring finger, middle finger, index finger, thumb
* fingers: n, s, e, w, c - north, south, east, west, and center (manual calls this "well" but we already have "west")
* thumb: p, n, c, l, u, k - pad, nail, center, lock (harder center), up, knuckle
*/
/* Mode LEDs are active-low on Port B on the Teensy. */
/* Lock LEDs are active-low on Port F on the Teensy. */
/* Appendix:
* Table based on https://geekhack.org/index.php?topic=12212.msg2059319#msg2059319
* Some pin assignments (e.g. for PS/2 I/O) have been fixed.
*
* Teensy Datahand 8051 pin pin 8051 Datahand Teensy
* ------ -------- ---- --- --- ---- -------- ------
* GND Mtrx send A P1.0 1 40 VCC VCC VCC
* PB7 Mtrx send B P1.1 2 39 P0.0 LED RH NAS PB6
* PD0 Mtrx send C P1.2 3 38 P0.1 LED RH NORM PB5
* PD1 Mtrx send D P1.3 4 37 P0.2 LED RH FCTN PB4
* PD2 RH rcv 0 P1.4 5 36 P0.3 LED RH 10K PB3
* PD3 RH rcv 1 P1.5 6 35 P0.4 LED RH unused PB2
* PD4 LH rcv 0 P1.6 7 34 P0.5 LED RH unused PE1
* PD5 LH rcv 1 P1.7 8 33 P0.6 LED RH unused PE0
* PD6 Reset button RST 9 32 P0.7 ? PE7
* PD7 ? P3.0 10 31 VPP - PE6
* PE0 ? P3.1 11 30 ALE - GND
* PE1 kbd data P3.2 12 29 PSEN - AREF
* PC0 ? P3.3 13 28 P2.7 ? PF0
* PC1 kbd clk P3.4 14 27 P2.6 ? PF1
* PC2 ? P3.5 15 26 P2.5 ? PF2
* PC3 RAM P3.6 16 25 P2.4 ? PF3
* PC4 RAM P3.7 17 24 P2.3 LED D15 LH (CAPLK) PF4
* PC5 XTAL2 XTAL2 18 23 P2.2 LED D13 LH (MSELK) PF5
* PC6 XTAL1 XTAL1 19 22 P2.1 LED D6 LH (NUMLK) PF6
* PC7 GND GND 20 21 P2.0 LED D14 LH (SCRLK) PF7
*
* JP3 Pinout
* 2 - keyboard data
* 3 - keyboard clock
*
* In order to get the Teensy to work, we need to move pin 1 to a different pin. This is
* because on the Teensy pin 1 is ground, but we need to write to pin 1 in order to read
* the keyboard matrix. An ideal pin to move it to is VPP (pin 31), because this pin tells
* the 8051 whether it should read from external or internal memory. The Teensy doesn't
* care about that.
*
* The easiest way to reassign the pin is to use standoffs. You can check out this thread:
* https://geekhack.org/index.php?topic=12212.msg235382#msg235382 for a picture of what
* this looks like. Note that in the picture the pin has been reassigned to pin 12. We
* don't want to do that because we're going to use that pin to send data over PS/2.
*
* We could if we wanted also reassign the PS/2 pins to Teensy hardware UART pins, but
* that's more work. Instead we'll just bit-bang PS/2 because it's an old, slow protocol
* (and because there's already a bit-banged PS/2 host implementation in QMK - we just
* need to add the device side).
*
* So overall, we want the following inputs and outputs:
* Outputs:
* Matrix:
* PB7
* PD0
* PD1
* PE6 (moved from pin1, GND)
* LEDs:
* PB3-6
* PF4-7
* Inputs:
* Matrix:
* PD2-5
* I/Os (start up as inputs):
* PS/2:
* PC1
* PE1
*/