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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 by default, so you don't need any inverter part. But it can also be built with 'make HARDWARE_SERIAL=y' to enable hardware serial if there is an inverter present. Good results have been obtained using a 74LS04 and hardware serial. 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 ```