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V-USB controller for HHKB
=========================
Not supported actively any more.
## Build
Use `Makefile.vusb` for [V-USB] controller.
$ make -f Makefile.vusb
##Hardware
###3. V-USB connection
+---+ +---------------+
USB GND | | ATmega328p |
~~~ C3 | |
5V <-------+--------+---|Vcc,AVCC | HHKB pro pro2
R1 | | ~~~~~~~~ ~~~~
D- <----+--+-----R2-----|INT1 PB2-4|------->ROW (6-8) (5-7)
D+ <----|---+----R3-----|INT0 PC0-2|------->COL (9-11) (8-10)
Z1 Z2 | PC3|------->ENABLE (12) (11)
GND<----+---+-----------|GND PB0|<-------KEY (4) (3)
| PB1|------->PREV (5) (4)
| |
GND+-C2--+--|XTAL1 RXD|------->Debug Console
X1 | TXD|<-------Debug Console
GND+-C3--+--|XTAL2 RST|---SW--+GND
+---------------+
R1: 1.5K Ohm
R2,R3: 68 Ohm
Z1,Z2: Zener 3.6V
C1,C2: 22pF
C3: 0.1uF
X1: Crystal 12MHz
SW: Push Switch(for bootloader)
- NOTE: See [V-USB] documentation for more detail of hardware and the USB stack.
- NOTE: [USBaspLoader] is very useful for firmware update.
[V-USB]: http://www.obdev.at/products/vusb/index.html
[USBaspLoader]: http://www.obdev.at/products/vusb/usbasploader.html
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