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PS/2 to USB keyboard converter |
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XT to USB keyboard converter |
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============================== |
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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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This firmware converts XT keyboard protocol to USB.(It supports Scan Code Set 1.) |
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Connect Wires |
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Connect Wires |
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1. Connect **Vcc** and **GND**. |
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1. Connect **Vcc** and **GND**. |
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2. Connect **Clock** and **Data** line. |
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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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- **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. Optionally you need pull-up resistor. 1K-10K Ohm is OK. |
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3. Optionally you need pull-up resistor. 1K-10K Ohm is OK. |
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To change pin configuration edit **config.h** and **Makefile**. |
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To change pin configuration edit **config.h** and **Makefile**. |
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$ make clean |
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$ make clean |
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$ make KEYMAP=[plain|jis|spacefn|...] |
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$ make KEYMAP=[plain|jis|spacefn|...] |
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After that you will find HEX file `ps2_usb_lufa.hex` in current directory. |
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- For **TMK converter Rev.1** use `make -f Makefile.tmk_rev1` instead of `make` and HEX file is `ps2_usb_tmk_rev1.hex`. |
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- For **TMK converter Rev.2** use `make -f Makefile.tmk_rev2` instead of `make` and HEX file is `ps2_usb_tmk_rev2.hex`. |
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After that you will find HEX file `xt_usb_lufa.hex` in current directory. |
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Keymap |
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Keymap |
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------ |
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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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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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Ethan Apodaca
7 years ago