V-USB.md

V-USB controller for HHKB

Not supported actively any more.

Build

Use Makefile.vusb for V-USB controller.

$ make -f Makefile.vusb

Hardware

                +---+   +---------------+
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.