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qmk_firmware/converter/sun_usb
History
tmk a551608873 sun_usb: LED update for hotplug keyboard into converter 10 years ago
..
Makefile Change TMK_DIR setting 10 years ago
README sun_usb: import dastels's keymap of Type 3 10 years ago
command_extra.c Add build option and Sun specific commands 11 years ago
config.h sun_usb: Fix serial recv intrrupt trriger edge #228 10 years ago
keymap.c fix hard-coded keys 11 years ago
keymap_sun3.c sun_usb: import dastels's keymap of Type 3 10 years ago
led.c sun_usb: Fix LED status update at startup 10 years ago
matrix.c sun_usb: LED update for hotplug keyboard into converter 10 years ago

README 

Sun to USB keyboard protocol converter
======================================
Target MCU is ATMega32u4 but other USB capable AVR will also work.

This converter will work with Sun Type 2-5 Keyboards.


Tested on:
Sun Type 3 Keyboard: http://blog.daveastels.com.s3-website-us-west-2.amazonaws.com/2014/12/27/type-3-keyboard.html
CTCSP SHORT TYPE KEYBOARD(Type 5): http://imgur.com/a/QIv6p


Keymap of Type 3(keymap_sun3.c) were impoted from dastels's repository.
https://github.com/dastels/tmk_keyboard/tree/master/converter/sun3_usb



Connector
---------
  8Pin mini DIN
     ___ ___
    /  |_|  \
   / 8  7  6 \
  | 5    4  3 |
   \_ 2   1 _/
     \_____/  
   (receptacle)

    Wiring:
    Pin mini DIN        MCU
    ----------------------------------
    1   GND             GND
    2   GND             GND
    3   5V
    4   RX/TX(Mouse)
    5   RX              PD3
    6   TX              PD2
    7   GND             GND
    8   5V              VCC


Protocol
--------
Signal: Asynchronous, Negative logic, 1200baud, No Flow control
Frame format: 1-Start bit, 8-Data bits, No-Parity, 1-Stop bit

    AVR USART engine expects positive logic while Sun keyboard signal is negative.
    To use AVR UART engine you need external inverter in front of RX and TX pin.
    Otherwise you can software serial routine to communicate the keyboard.

This converter uses software method, you doesn't need any inverter part.


Commands From System To Keyboard
    0x01 Reset
            Keyboard responds with following byte sequence:
            Success: 0xFF 0x04 0x7F
            Fail:    0x7E 0x01 0x7F
    0x02 Bell On
    0x03 Bell Off
    0x0A Click On
    0x0B Click Off
    0x0E LED
            followed by LED status byte:
            bit: 3       2       1       0
            LED: CapsLk  ScrLk   Compose NumLk
    0x0F Layout
            Keyboard responds with 'Layout Response' 0xFE 0xXX

Commands From Keyboard To System
    0x7F Idle
            means no keys pressed.
    0xFE Layout Response
    0xFF Reset Response(followed by 0x04)
     
Reference
    http://kentie.net/article/sunkbd/page2.htm
    http://kentie.net/article/sunkbd/KBD.pdf


Build Firmware
--------------
Just use 'make'
    $ cd sun_usb
    $ make
Then, load the binary to MCU with your favorite programmer.


Sun commands
------------
You can send Sun protocol commands with TMK `Magic` key combo. By default `Magic` key is `LShift` + `RShift`, `LAlt` + `RAlt' or `LMeta` + `RMeta`.
https://github.com/tmk/tmk_keyboard#magic-commands

Following Sun specific commands are available. For example, to send 'Bell On' you can press `LShift` + `RShift` + `Up` keys simultaneously.

```
----- Sun converter Help -----
Up:     Bell On
Down:   Bell Off
Left:   Click On
Right:  Click Off
PgUp:   LED all On
PgDown: LED all On
Insert: Layout
Delete: Reset
```