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1 Sun to USB keyboard protocol converter
2 ======================================
3 Target MCU is ATMega32u4 but other USB capable AVR will also work.
4
5 This converter will work with Sun Type 2-5 Keyboards.
6
7
8 Tested on:
9 Sun Type 3 Keyboard: http://blog.daveastels.com.s3-website-us-west-2.amazonaws.com/2014/12/27/type-3-keyboard.html
10 CTCSP SHORT TYPE KEYBOARD(Type 5): http://imgur.com/a/QIv6p
11
12
13 Keymap of Type 3(keymap_sun3.c) were impoted from dastels's repository.
14 https://github.com/dastels/tmk_keyboard/tree/master/converter/sun3_usb
15
16
17
18 Connector
19 ---------
20   8Pin mini DIN
21      ___ ___
22     /  |_|  \
23    / 8  7  6 \
24   | 5    4  3 |
25    \_ 2   1 _/
26      \_____/  
27    (receptacle)
28
29     Wiring:
30     Pin mini DIN        MCU
31     ----------------------------------
32     1   GND             GND
33     2   GND             GND
34     3   5V
35     4   RX/TX(Mouse)
36     5   RX              PD3
37     6   TX              PD2
38     7   GND             GND
39     8   5V              VCC
40
41
42 Protocol
43 --------
44 Signal: Asynchronous, Negative logic, 1200baud, No Flow control
45 Frame format: 1-Start bit, 8-Data bits, No-Parity, 1-Stop bit
46
47     AVR USART engine expects positive logic while Sun keyboard signal is negative.
48     To use AVR UART engine you need external inverter in front of RX and TX pin.
49     Otherwise you can software serial routine to communicate the keyboard.
50
51 This converter uses software method, you doesn't need any inverter part.
52
53
54 Commands From System To Keyboard
55     0x01 Reset
56             Keyboard responds with following byte sequence:
57             Success: 0xFF 0x04 0x7F
58             Fail:    0x7E 0x01 0x7F
59     0x02 Bell On
60     0x03 Bell Off
61     0x0A Click On
62     0x0B Click Off
63     0x0E LED
64             followed by LED status byte:
65             bit: 3       2       1       0
66             LED: CapsLk  ScrLk   Compose NumLk
67     0x0F Layout
68             Keyboard responds with 'Layout Response' 0xFE 0xXX
69
70 Commands From Keyboard To System
71     0x7F Idle
72             means no keys pressed.
73     0xFE Layout Response
74     0xFF Reset Response(followed by 0x04)
75      
76 Reference
77     http://kentie.net/article/sunkbd/page2.htm
78     http://kentie.net/article/sunkbd/KBD.pdf
79
80
81 Build Firmware
82 --------------
83 Just use 'make'
84     $ cd sun_usb
85     $ make
86 Then, load the binary to MCU with your favorite programmer.
87
88
89 Sun commands
90 ------------
91 You can send Sun protocol commands with TMK `Magic` key combo. By default `Magic` key is `LShift` + `RShift`, `LAlt` + `RAlt' or `LMeta` + `RMeta`.
92 https://github.com/tmk/tmk_keyboard#magic-commands
93
94 Following Sun specific commands are available. For example, to send 'Bell On' you can press `LShift` + `RShift` + `Up` keys simultaneously.
95
96 ```
97 ----- Sun converter Help -----
98 Up:     Bell On
99 Down:   Bell Off
100 Left:   Click On
101 Right:  Click Off
102 PgUp:   LED all On
103 PgDown: LED all On
104 Insert: Layout
105 Delete: Reset
106 ```