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qmk_firmware/converter/ps2_usb
History
tmk 4c8e0fd0bd Port ps2_usb to mbed 10 years ago
..
Makefile Add Makefiles for TMK converters. 11 years ago
Makefile.mbed Port ps2_usb to mbed 10 years ago
Makefile.pjrc
…
Makefile.tmk_rev1 Add Makefiles for TMK converters. 11 years ago
Makefile.tmk_rev2 Add Makefiles for TMK converters. 11 years ago
Makefile.vusb
…
README.md Fixing typo 11 years ago
config.h
…
config_mbed.h Port ps2_usb to mbed 10 years ago
config_tmk_rev1.h Add Makefiles for TMK converters. 11 years ago
config_tmk_rev2.h Fix keymap of ps2_usb 11 years ago
keymap_common.c Port ps2_usb to mbed 10 years ago
keymap_common.h Port ps2_usb to mbed 10 years ago
keymap_jis.c Add SpaceFN keymap and JIS keymap 11 years ago
keymap_plain.c Add SpaceFN keymap and JIS keymap 11 years ago
keymap_spacefn.c Fix keymap of ps2_usb 11 years ago
led.c
…
main.cpp Port ps2_usb to mbed 10 years ago
matrix.c Port ps2_usb to mbed 10 years ago
usbconfig.h
…

README.md

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_<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

You can also use this converter on ATmega(168/328) with V-USB instead of Teensy. The converter on V-USB lacks some features for now: USB NKRO and System/Media control.

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)