Fix README.md of hhkb

[tmk_firmware.git] / keyboard / hhkb / doc / V-USB.md

diff --git a/keyboard/hhkb/doc/V-USB.md b/keyboard/hhkb/doc/V-USB.md
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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