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-PS/2 to USB keyboard converter
-==============================
-This firmware converts PS/2 keyboard protocol to USB.(It supports Scan Code Set 2.)
-
-
-Connect Wires
--------------
-In case of Teensy2.0(ATMega32U4):
-
-1. Connect **Vcc** and **GND**.
-2. Connect **Clock** and **Data** line.
- - **Interrupt**: **Clock** is on `PD1` and **Data** on `PD0`.(Recommended. Soarer's converter compatible)
- - **Busywait**: **Clock** is on `PD1` and **Data** on `PD0`.
- - **USART**: **Clock** is on `PD5` and **Data** on `PD2`.
-3. Optionally you need pull-up resistor. 1K-10K Ohm is OK.
-
-To change pin configuration edit **config.h** and **Makefile**.
-
-
-Build Firmware
---------------
-For **PJRC Teensy** just run `make`:
-
- $ make clean
- $ make
-
-To select keymap:
-
- $ make clean
- $ make KEYMAP=[plain|jis|spacefn|...]
-
-After that you will find HEX file `ps2_usb_lufa.hex` in current directory.
-
-
-- For **TMK converter Rev.1** use `make -f Makefile.tmk_rev1` instead of `make` and HEX file is `ps2_usb_tmk_rev1.hex`.
-
-- For **TMK converter Rev.2** use `make -f Makefile.tmk_rev2` instead of `make` and HEX file is `ps2_usb_tmk_rev2.hex`.
-
-
-Keymap
-------
-Several version of keymap are available in advance but you are recommended to define your favorite layout yourself. To define your own keymap create file named `keymap_<name>.c` and see keymap document(you can find in README.md of top directory) and existent keymap files.
-
-
-PS/2 signal handling implementations
-------------------------------------
-Following three methods can be used to implement PS/2 signal handling.
-
-### Simple and stupid busy-wait(ps2_busywait.c)
- This is expected to implemented with portable C code for reference.
-### Interrupt driven(ps2_interrupt.c)
- Uses pin interrupt to detect falling edge of clock line.
-### USART hardware module(ps2_usart.c)
- Uses AVR USART engine to receive PS/2 signal.
-
-To select method edit Makefile.
-
-
-V-USB Support
--------------
-With V-USB you can use this converter on ATmega(168/328) but it doesn't support NKRO at this time.
-
-Circuit:
-
- +---+ +---------------+
- USB GND | | ATmega168 |
- === C3 | |
- 5V <-------+--------+---|Vcc,AVCC | PS/2
- R1 | | ====
- D- <----+--+-----R2-----|INT1 RXD|------->DATA
- D+ <----|---+----R3-----|INT0 XCK|------->CLOCK
- Z1 Z2 | | ->5V
- GND<----+---+--+--+-----|GND | ->GND
- | | | |
- | C2-+--|XTAL1 |
- | X1 | |
- +--C3-+--|XTAL2 |
- +---------------+
- R1: 1.5K Ohm
- R2,R3: 68 Ohm
- Z1,Z2: Zenner 3.6V
- C1,C2: 22pF
- C3: 0.1uF
- X1: Crystal 20MHz(16MHz/12MHz)