90 lines
2.4 KiB
Markdown
90 lines
2.4 KiB
Markdown
# Sun to USB keyboard protocol converter
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A converter for using non-USB Sun keyboards.
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Original code from the [TMK firmware](https://github.com/tmk/tmk_keyboard/tree/master/converter/sun_usb). Ported to QMK by [Yann Hodique](https://github.com/sigma).
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Keyboard Maintainer: [Yann Hodique](https://github.com/sigma)
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Hardware Supported: See hardware section below
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Hardware Availability: self-built
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Make example for this keyboard (after setting up your build environment):
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make converter/sun_usb/type5:default
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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.
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## Hardware
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Target MCU is ATMega32u4 but other USB capable AVR will also work. The maintainer mostly uses Teensy 2.0 boards.
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Supported keyboards: Sun Type 3 and 5 Keyboards,
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### Connector
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8Pin mini DIN
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___ ___
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/ |_| \
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/ 8 7 6 \
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| 5 4 3 |
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\_ 2 1 _/
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\_____/
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(receptacle)
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Wiring:
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Pin mini DIN MCU
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----------------------------------
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1 GND GND
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2 GND GND
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3 5V
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4 RX/TX(Mouse)
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5 RX PD3
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6 TX PD2
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7 GND GND
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8 5V VCC
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### Protocol
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Signal: Asynchronous, Negative logic, 1200baud, No Flow control
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Frame format: 1-Start bit, 8-Data bits, No-Parity, 1-Stop bit
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AVR USART engine expects positive logic while Sun keyboard signal is negative.
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To use AVR UART engine you need external inverter in front of RX and TX pin.
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Otherwise you can software serial routine to communicate the keyboard.
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This converter uses software method, you doesn't need any inverter part.
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Commands From System To Keyboard
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0x01 Reset
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Keyboard responds with following byte sequence:
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Success: 0xFF 0x04 0x7F
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Fail: 0x7E 0x01 0x7F
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0x02 Bell On
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0x03 Bell Off
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0x0A Click On
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0x0B Click Off
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0x0E LED
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followed by LED status byte:
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bit: 3 2 1 0
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LED: CapsLk ScrLk Compose NumLk
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0x0F Layout
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Keyboard responds with 'Layout Response' 0xFE 0xXX
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Commands From Keyboard To System
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0x7F Idle
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means no keys pressed.
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0xFE Layout Response
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0xFF Reset Response(followed by 0x04)
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References
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* http://kentie.net/article/sunkbd/page2.htm
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* http://kentie.net/article/sunkbd/KBD.pdf
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