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
+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
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.
+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
$ 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
+```