77 lines
2.4 KiB
Markdown
77 lines
2.4 KiB
Markdown
PS/2 to USB keyboard converter
|
|
==============================
|
|
This firmware converts PS/2 keyboard protocol to USB and supports only Scan Code Set 2.
|
|
|
|
|
|
PS/2 signal handling implementations
|
|
------------------------------------
|
|
Following three methods are 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 recevie PS/2 signal.
|
|
|
|
To select method edit Makefile.
|
|
|
|
|
|
Connect Wires
|
|
-------------
|
|
In case of Teensy2.0(ATMega32U4):
|
|
|
|
1. Connect Vcc and GND.
|
|
2. Connect Clock and Data line.
|
|
- Busywait: Clock is on PD5 and Data on PD2.
|
|
- Interrupt: Clock is on PD1 and Data on PD2.
|
|
- USART: Clock is on PD5 and Data on PD2.
|
|
3. Optionally you need pull-up register. 1K-10K Ohm is OK.
|
|
|
|
To change pin configuration edit config.h.
|
|
|
|
|
|
Build Frimware
|
|
--------------
|
|
Just run `make`:
|
|
|
|
$ make
|
|
|
|
To select keymap:
|
|
|
|
$ make KEYMAP=[plain|jis|spacefn|...]
|
|
|
|
|
|
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 top README.md) and existent keymap files.
|
|
|
|
|
|
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)
|