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Sun to USB keyboard protocol converter
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Target MCU is ATMega32u4 but other USB capable AVR will also work.
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Supported keyboards: Sun Type 5 Keyboard, CTCSP SHORT TYPE KEYBOARD(CKUB)
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CTCSP SHORT TYPE KEYBOARD: http://imgur.com/a/QIv6p
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Connector
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---------
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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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--------
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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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Reference
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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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Build Firmware
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--------------
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Just use 'make'
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$ cd sun_usb
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$ make
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Then, load the binary to MCU with your favorite programmer.
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