4 This file and the entire QMK port of this board are based on its TMK implementation: https://github.com/tmk/tmk_keyboard/tree/master/keyboard/fc980c
8 - Keyboard Maintainer: [Balz Guenat](https://github.com/BalzGuenat)
9 - Hardware Supported: Hasu's Alt Controller (see below)
10 - Hardware Availability: https://geekhack.org/index.php?topic=90317.0
12 Make example for this keyboard (after setting up your build environment):
16 See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
18 To flash the firmware, press the reset button on the controller and run:
20 sudo make fc660c:default:dfu
24 Thread on Geekhack: https://geekhack.org/index.php?topic=88439.0
26 Also: https://geekhack.org/index.php?topic=88720.0
32 | board | board |Description |Schematic |ATmega32u4
33 |--------|-----------|--------------------------------------|-----------|------------
35 | 2 |19 | GND |GND |GND
36 | 3 |18 | GND |GND |GND
37 | 4 |17 | 3.3V |V33 |3.3V/5V
39 | 6 |15 |*Z6-TP1684-4-HYS(o) |FBSTB |PC7
40 | 7 |14 |*Z6-TP1684-2-KEY(i) |OUT |PC6
41 | 8 |13 |*Z2-AD5258-5-SCL(I2C) |SCL |PD0(TWI)
42 | 9 |12 |*Z2-AD5258-4-SDA(I2C) |SDA |PD1(TWI)
43 |10 |11 |*Z4-LV4051A-6-~EN(Col 0-7) |INH_1 |PB4
44 |11 |10 |*Z5-LV4051A-6-~EN(Col 8-F) |INH_2 |PB3
45 |12 | 9 |+Z7-LV07A-5 (LV4051A-9-C) |SEL_C |PB2
46 |13 | 8 |+Z7-LV07A-1 (LV4051A-10-B) |SEL_B |PB1
47 |14 | 7 |+Z7-LV07A-3 (LV4051A-11-A) |SEL_A |PB0
48 |15 | 6 |+Z3-LVC138A-3-C |COL4 |PD6
49 |16 | 5 |+Z3-LVC138A-2-B |COL3 |PD5
50 |17 | 4 |+Z3-LVC138A-1-A |COL2 |PD4
51 |18 | 3 |+Z3-LVC138A-4-~G2A Z6-TP1684-5-~EN |COL1 |PD7
52 |19 | 2 |+Z7-LV07A-11-~InsertLED |LED1 |PB5
53 |20 | 1 |+Z7-LV07A-13-~CapsLED |LED2 |PB6
60 - Connector on Switch board: https://i.imgur.com/Zi89xO5.jpg
61 - Connector on Controller board: https://i.imgur.com/9SZUzYo.jpg
66 Row5-7 have no key, you can omit scaning on those lines. Topre original controller scans those rows for some reason.
68 | |0 |1 |2 |3 |4 |5 |6 |7 |8 |9 |A |B |C |D |E |F |
69 |----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|
70 | 0|Q |W |E |Tab |R |U |T |Y |O |P |[ |I |] | |\ |Del |
71 | 1|1 |2 |3 |Esc |4 |7 |5 |6 |9 |0 |- |8 |= | |BSpc|Ins |
72 | 2| |LWin|LAlt|LCtl| | | |Spc |RAlt| |RCtl| |Fn |Down|Left|Rght|
73 | 3| |Z |X |LSft|C |N |V |B |, |. |/ |M |RSft|Up | | |
74 | 4|A |S |D |Caps|F |J |G |H |L |; |' |K | | |Entr| |
75 | 5| | | | | | | | | | | | | | | | |
76 | 6| | | | | | | | | | | | | | | | |
77 | 7| | | | | | | | | | | | | | | | |
80 - http://i.imgur.com/9XoNTev.png
81 - https://i.imgur.com/5FCP1Ay.png
83 This code emuluates what original cotnroller does for matrix scan.
84 - https://github.com/tmk/tmk_keyboard/blob/master/keyboard/fc660c/fc660c.c
88 LV138A(Z3) selects a row line and gives strobe by enabling with ~G2A(18).
102 ### Column designation
103 LV4051A(Z4, Z5) select one of 16 column lines to sense capacitance of switches.
105 |Col |A/14|B/13|C/12|Z4-EN/10|Z5-EN/11|
106 |----|----|----|----|--------|--------|
127 https://fccid.io/RPKFC660C
129 - schematic: https://fccid.io/pdf.php?id=1888185
130 - part list: https://fccid.io/pdf.php?id=1888184
135 - Hirose DF14A-20P-1.25H: http://www.mouser.com/ds/2/185/DF14_catalog-939195.pdf
136 - LV07A: http://www.ti.com/lit/ds/symlink/sn74lv07a.pdf
137 - LV138A: http://www.ti.com/lit/ds/symlink/sn74lvc138a.pdf
138 - LV4051A: http://www.ti.com/lit/ds/symlink/sn74lv4051a.pdf
139 - AD5258: http://www.analog.com/media/en/technical-documentation/data-sheets/AD5258.pdf
144 LV07A and LVC138A are 5V-tolerant and can be powered with 5V, the keyboard will work only with 5V power supply. It may not be completely safe to operate LV138A with 5V Vcc, its datasheet says:
146 > Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
150 Controller can operate AD5258 via I2C to change actuation point of keys. This may make keyboard unusable accidentally and it will be difficult to recovery in some situation. For safety firmware doesn't support it at this point, though.
152 Lower value of RDAC register causes shallower actuation point.
156 - Pics: https://imgur.com/a/UTR8Z