90 lines
3 KiB
Markdown
90 lines
3 KiB
Markdown
PS/2 to USB keyboard converter
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==============================
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This firmware converts PS/2 keyboard protocol to USB.(It supports Scan Code Set 2.)
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You can discuss about this converter here.
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https://geekhack.org/index.php?topic=14618.0
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Preassembled TMK PS/2-USB converter is available here.
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https://geekhack.org/index.php?topic=72052.0
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Build Firmware
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--------------
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For **TMK converter Rev.2**:
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$ make -f Makefile.rev2 clean
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$ make -f Makefile.rev2 KEYMAP=plain
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To program firmware push the button on converter and run:
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$ make -f Makefile.rev2 KEYMAP=plain dfu
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For **TMK converter Rev.1** use `Makefile.rev1` instead.
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If your use DIY converter with ATMega32u4 board you can use `Makefile.32u4`, but note that progarmming with 'dfu' may not work for your converter.
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Build your own converter
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------------------------
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Use ATMega32u4 as controller and Makefile.32u4 to build firmware.
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1. Wire **Vcc** and **GND** properly.
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2. Connect **Clock** to `PD1` and **Data** to `PD0` line. (Compatible to Soarer's converter pin configuration)
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3. You need pull-up resistors on both signal lines. 1K-10K Ohm would be fine.
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You can configure controller and pin configurations in Makefile and config.h.
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Keymap
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------
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To define your own keymap copy `unimap_plain.c` to `unimap_<name>.c` and edit it. Or just edit `unimap_plain.c` directly.
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See wiki pages and documents.
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https://github.com/tmk/tmk_keyboard/wiki
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PS/2 signal handling implementations
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------------------------------------
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Following three methods are available to implement PS/2 signal handling.
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- **Interrupt** Uses pin interrupt to detect falling edge of clock line. **Recommended.** (ps2_interrupt.c)
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- **Busywait** Implementation with portable C code for reference. (ps2_busywait.c)
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- **USART** Uses AVR USART hardware engine to receive PS/2 signal. You must use this fothis for V-USB. (ps2_usart.c)
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TMK converter rev1 uses **USART** and rev2 uses **Interrupt** for reference.
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You can change method by editing `Makefile` but not needed in most case.
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V-USB Support
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-------------
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With V-USB you can use this converter on ATmega(168/328). Use Makefile.vusb to build firmeware. Not supported actively anymore.
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Circuit:
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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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