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     $ make -f Makefile.vusb
   8
   9 ##Hardware
  10 ###3. V-USB connection
  11                     +---+   +---------------+
  12     USB            GND  |   |   ATmega328p  |
  13     ~~~                 C3  |               |
  14     5V <-------+--------+---|Vcc,AVCC       |               HHKB pro    pro2
  15                R1           |               |               ~~~~~~~~    ~~~~
  16     D- <----+--+-----R2-----|INT1      PB2-4|------->ROW    (6-8)       (5-7)
  17     D+ <----|---+----R3-----|INT0      PC0-2|------->COL    (9-11)      (8-10)
  18             Z1  Z2          |            PC3|------->ENABLE (12)        (11)
  19     GND<----+---+-----------|GND         PB0|<-------KEY    (4)         (3)
  20                             |            PB1|------->PREV   (5)         (4)
  21                             |               |
  22                 GND+-C2--+--|XTAL1       RXD|------->Debug Console
  23                          X1 |            TXD|<-------Debug Console
  24                 GND+-C3--+--|XTAL2       RST|---SW--+GND
  25                             +---------------+
  26     R1:     1.5K Ohm
  27     R2,R3:  68 Ohm
  28     Z1,Z2:  Zener 3.6V
  29     C1,C2:  22pF
  30     C3:     0.1uF
  31     X1:     Crystal 12MHz
  32     SW:     Push Switch(for bootloader)
  33
  34 - NOTE: See [V-USB] documentation for more detail of hardware and the USB stack.
  35 - NOTE: [USBaspLoader] is very useful for firmware update.
  36
  37
  38 [V-USB]: http://www.obdev.at/products/vusb/index.html
  39 [USBaspLoader]: http://www.obdev.at/products/vusb/usbasploader.html