keyboard/hhkb/doc/V-USB.md

   1 V-USB controller for HHKB
   2 =========================
   3 Not supported actively any more.
   4
   5 ## Build
   6 Use `Makefile.vusb` for [V-USB] controller.
   7
   8     $ make -f Makefile.vusb
   9
  10 ## Hardware
  11
  12                     +---+   +---------------+
  13     USB            GND  |   |   ATmega328p  |
  14     ~~~                 C3  |               |
  15     5V <-------+--------+---|Vcc,AVCC       |               HHKB pro    pro2
  16                R1           |               |               ~~~~~~~~    ~~~~
  17     D- <----+--+-----R2-----|INT1      PB2-4|------->ROW    (6-8)       (5-7)
  18     D+ <----|---+----R3-----|INT0      PC0-2|------->COL    (9-11)      (8-10)
  19             Z1  Z2          |            PC3|------->ENABLE (12)        (11)
  20     GND<----+---+-----------|GND         PB0|<-------KEY    (4)         (3)
  21                             |            PB1|------->PREV   (5)         (4)
  22                             |               |
  23                 GND+-C2--+--|XTAL1       RXD|------->Debug Console
  24                          X1 |            TXD|<-------Debug Console
  25                 GND+-C3--+--|XTAL2       RST|---SW--+GND
  26                             +---------------+
  27     R1:     1.5K Ohm
  28     R2,R3:  68 Ohm
  29     Z1,Z2:  Zener 3.6V
  30     C1,C2:  22pF
  31     C3:     0.1uF
  32     X1:     Crystal 12MHz
  33     SW:     Push Switch(for bootloader)
  34
  35 - NOTE: See [V-USB] documentation for more detail of hardware and the USB stack.
  36 - NOTE: [USBaspLoader] is very useful for firmware update.
  37
  38
  39 [V-USB]: http://www.obdev.at/products/vusb/index.html
  40 [USBaspLoader]: http://www.obdev.at/products/vusb/usbasploader.html