79 lines
2.7 KiB
Markdown
79 lines
2.7 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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Connect Wires
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1. Connect **Vcc** and **GND**.
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2. Connect **Clock** and **Data** line.
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- **Interrupt**: **Clock** is on `PD1` and **Data** on `PD0`.(Recommended. Soarer's converter compatible)
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- **Busywait**: **Clock** is on `PD1` and **Data** on `PD0`.
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- **USART**: **Clock** is on `PD5` and **Data** on `PD2`.
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3. You need pull-up resistors. 1K-10K Ohm would be fine.
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To change pin configuration edit **config.h** and **Makefile**.
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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 `make -f Makefile.rev1` instead.
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- To select keymap use `jis`, `spacefn` or your own in place of `plain`.
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Keymap
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------
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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.
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PS/2 signal handling implementations
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------------------------------------
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Following three methods can be used to implement PS/2 signal handling.
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### Simple and stupid busy-wait(ps2_busywait.c)
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This is expected to implemented with portable C code for reference.
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### Interrupt driven(ps2_interrupt.c)
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Uses pin interrupt to detect falling edge of clock line.
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### USART hardware module(ps2_usart.c)
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Uses AVR USART engine to receive PS/2 signal.
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To select method edit Makefile.
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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) but it doesn't support NKRO at this time.
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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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