mirror of
https://github.com/Keychron/qmk_firmware.git
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123 lines
3.9 KiB
Plaintext
123 lines
3.9 KiB
Plaintext
PS/2 to USB keyboard converter
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==============================
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This firmware converts PS/2 keyboard protocol to USB and supports only Scan Code Set 2.
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This will works on USB AVR(ATMega32U4, AT90USB) or V-USB(ATMega168, 328...).
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Features
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--------
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Mouse keys
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You can emulates mouse move and button click using keyboard.
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System/Media control
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You can sends Power event, Volume down/up and Mute.
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USB NKRO(actually 120KRO+8Modifiers)
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You can tolggles NKRO feature.
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Keymap customization
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You can customize keymaps easily by editing source code. See keymap.c.
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PS/2 signal handling implementations
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------------------------------------
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Following three methods are used to implement PS/2 signal handling.
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a. Simple and stupid busy-wait(ps2.c)
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This is expected to implemented with portable C code for reference.
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b. Interrupt driven(ps2.c)
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Uses external interrupt to detect falling edge of clock line.
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c. USART hardware module(ps2_usart.c)
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Uses AVR USART engine to recevie PS/2 signal. Recomended and default.
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This is required to work with V-USB, preceding two methods tend to
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miss signal edges while V-USB handles USB.
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To select method edit Makefile.
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Connect Wires
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-------------
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In case of Teensy2.0(ATMega32U4):
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0. Connect Vcc and GND.
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1. Connect Clock and Data line.
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For a. Clock is on PF0 and Data on PF1.
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For b. Clock is on PD1 and Data on PD2.
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For c. Clock is on PD5 and Data on PD2.
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2. Optionally you need pull-up register. 1K-10K Ohm is OK.
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To change pin configuration edit config.h.
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Build Frimware
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--------------
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1. Edit Makefile for build options and MCU setting.
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Use 'atmega32u4' for Teensy 2.0 or 'at90usb1286' for Teensy++ 2.0.
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2. make
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Just type `make` in a terminal.
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Use `-f Makefile.vusb` option to build V-USB converter.
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Use `-f Makefile.jis` option to use JIS keyboard.
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3. program MCU.
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In case of Teensy use `Teensy Loader`.(http://www.pjrc.com/teensy/loader.html)
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Otherwise you want to use `avrdude` or `dfu-programmer`.
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Demonstration of Features
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-------------------------
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In default configuration, you can try several keymaps, mousekeys and USB NKRO.
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Use following magic key combinations to enable some features.
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keymaps and NKRO:
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Magic+0: Qwerty with mousekeys(default)
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Magic+1: Qwerty without mousekeys
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Magic+2: Colemak
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Magic+3: Dvorak
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Magic+4: Workman
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Magic+N: toggles NKRO/6KRO(6KRO by default)
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Magic+Esc: sends Power Event(Power button)
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where Magic=(LShift+RShift) or (LControl+RShift)
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Fn layer function:
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Fn0+(hjkl): Mousekey move(vi cursor like)
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Fn0+(yuio): Mouse wheel(left,down,up,right)
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Fn0+space: Mouse left button
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Fn0+(mnb): Mouse buttons(m=left, n=right, b=middle)
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Fn0+(zxc): Media control(Volup, Voldown, Mute)
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Fn1+(hjkl): Cursor move(vi cursor like)
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Fn1+(nm,.): Cursor move(Home,PageDown,PageUp,End)
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where Fn0=;, Fn1=/
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Keymap
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------
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You can change a keymap by editing code of keymap. See common/keycode.h for key symbols.
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V-USB Support
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-------------
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You can also use this converter on ATmega(168/328) with V-USB instead of Teensy.
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The converter on V-USB lacks some features for now: USB NKRO and System/Media control.
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Circuit
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-------
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+---+ +---------------+
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USB GND | | ATmega168 |
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=== C3 | |
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5V <-------+--------+---|Vcc,AVCC | PS/2
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R1 | | ====
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D- <----+--+-----R2-----|INT1 RXD|------->DATA
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D+ <----|---+----R3-----|INT0 XCK|------->CLOCK
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Z1 Z2 | | ->5V
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GND<----+---+--+--+-----|GND | ->GND
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| | | |
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| C2-+--|XTAL1 |
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| X1 | |
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+--C3-+--|XTAL2 |
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+---------------+
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R1: 1.5K Ohm
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R2,R3: 68 Ohm
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Z1,Z2: Zenner 3.6V
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C1,C2: 22pF
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C3: 0.1uF
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X1: Crystal 20MHz(16MHz/12MHz)
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EOF
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