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