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. 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_.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)