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 Supported keyboards: Sun Type 5 Keyboard, CTCSP SHORT TYPE KEYBOARD(CKUB)
   5
   6 CTCSP SHORT TYPE KEYBOARD: http://imgur.com/a/QIv6p
   7
   8
   9
  10
  11 Connector
  12 ---------
  13   8Pin mini DIN
  14      ___ ___
  15     /  |_|  \
  16    / 8  7  6 \
  17   | 5    4  3 |
  18    \_ 2   1 _/
  19      \_____/
  20    (receptacle)
  21
  22     Wiring:
  23     Pin mini DIN        MCU
  24     ----------------------------------
  25     1   GND             GND
  26     2   GND             GND
  27     3   5V
  28     4   RX/TX(Mouse)
  29     5   RX              PD3
  30     6   TX              PD2
  31     7   GND             GND
  32     8   5V              VCC
  33
  34
  35 Protocol
  36 --------
  37 Singnal: Asynchronous, Negative logic, 1200baud, No Flow control
  38 Frame format: 1-Start bit, 8-Data bits, No-Parity, 1-Stop bit
  39
  40     AVR USART engine expects positive logic while Sun keyboard signal is negative.
  41     To use AVR UART engine you need exteral inverter in front of RX and TX pin.
  42     Otherwise you can software serial routine to communicate the keyboard.
  43
  44 This converter uses software method, you doesn't need any inverter part.
  45
  46
  47 Commands From System To Keyboard
  48     0x01 Reset
  49             Keyboard responds with following byte sequence:
  50             Success: 0xFF 0x04 0x7F
  51             Fail:    0x7E 0x01 0x7F
  52     0x02 Bell On
  53     0x03 Bell Off
  54     0x0A Click On
  55     0x0B Click Off
  56     0x0E LED
  57             followed by LED status byte:
  58             bit: 3       2       1       0
  59             LED: CapsLk  ScrLk   Compose NumLk
  60     0x0F Layout
  61             Keyboard responds with 'Layout Response' 0xFE 0xXX
  62
  63 Commands From Keyboard To System
  64     0x7F Idle
  65             means no keys pressed.
  66     0xFE Layout Response
  67     0xFF Reset Response(followed by 0x04)
  68
  69 Reference
  70     http://kentie.net/article/sunkbd/page2.htm
  71     http://kentie.net/article/sunkbd/KBD.pdf
  72
  73
  74 Build Firmware
  75 --------------
  76 Just use 'make'
  77     $ cd sun_usb
  78     $ make
  79 Then, load the binary to MCU with your favorite programmer.