converter/sun_usb/README

   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 by default, so you don't need any inverter part.  But
  52 it can also be built with 'make HARDWARE_SERIAL=y' to enable hardware serial if there
  53 is an inverter present.  Good results have been obtained using a 74LS04 and hardware serial.
  54
  55
  56 Commands From System To Keyboard
  57     0x01 Reset
  58             Keyboard responds with following byte sequence:
  59             Success: 0xFF 0x04 0x7F
  60             Fail:    0x7E 0x01 0x7F
  61     0x02 Bell On
  62     0x03 Bell Off
  63     0x0A Click On
  64     0x0B Click Off
  65     0x0E LED
  66             followed by LED status byte:
  67             bit: 3       2       1       0
  68             LED: CapsLk  ScrLk   Compose NumLk
  69     0x0F Layout
  70             Keyboard responds with 'Layout Response' 0xFE 0xXX
  71
  72 Commands From Keyboard To System
  73     0x7F Idle
  74             means no keys pressed.
  75     0xFE Layout Response
  76     0xFF Reset Response(followed by 0x04)
  77
  78 Reference
  79     http://kentie.net/article/sunkbd/page2.htm
  80     http://kentie.net/article/sunkbd/KBD.pdf
  81
  82
  83 Build Firmware
  84 --------------
  85 Just use 'make'
  86     $ cd sun_usb
  87     $ make
  88 Then, load the binary to MCU with your favorite programmer.
  89
  90
  91 Sun commands
  92 ------------
  93 You can send Sun protocol commands with TMK `Magic` key combo. By default `Magic` key is `LShift` + `RShift`, `LAlt` + `RAlt' or `LMeta` + `RMeta`.
  94 https://github.com/tmk/tmk_keyboard#magic-commands
  95
  96 Following Sun specific commands are available. For example, to send 'Bell On' you can press `LShift` + `RShift` + `Up` keys simultaneously.
  97
  98 ```
  99 ----- Sun converter Help -----
 100 Up:     Bell On
 101 Down:   Bell Off
 102 Left:   Click On
 103 Right:  Click Off
 104 PgUp:   LED all On
 105 PgDown: LED all On
 106 Insert: Layout
 107 Delete: Reset
 108 ```