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Added USART implementation for PS/2 signal handling.

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tmk 2012-01-16 00:41:06 +09:00
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ps2_usb/README
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@ -1,40 +1,56 @@
PS/2 to USB keyboard converter
==============================
This firmware converts PS/2 keyboard protocol to USB and for now supports only Scan Code Set 2.
This will works on USB AVR(ATMega32U4, AT90USB) or V-USB.
Features
--------
Mouse keys
You can emulates mouse move and button click using keyboard.
System/Media control
You can sends Power event, Volume down/up and Mute.
USB NKRO(actually 120KRO+8Modifiers)
You can tolggles NKRO feature.
Keymap customization
You can customize keymaps easily by editing source code. See keymap.c.
PS/2 signal handling implementations
------------------------------------
Following three methods are used to implement PS/2 signal handling.
a. Simple and stupid wait & read loop(intensive use of cycles)
This is implemented with (expected) portable C code for reference. See ps2.c.
b. Interrupt driven
See ps2_intr.c
c. Using USART hardware module(no cycle needed)
This uses AVR USART function to recevie PS/2 signal and be used in V-USB converter.
See ps2_usart.c.
Build Converter
---------------
0. Connect PS/2 keyboard into Teensy with 4 lines(Vcc, GND, Data, Clock).
By default Clock is on PF0 and Data on PF1.
You can change this pin configuration by editing config_pjrc.h.
In this photo Vcc is yellow, GND is green, Data is red and Clock is black.
http://img17.imageshack.us/img17/7243/201101181933.jpg
Connect PS/2 keyboard into Teensy with 4 lines(Vcc, GND, Data, Clock).
For a. Simple and stupid and b. Interrupt implementaion:
By default Clock is on PF0 and Data on PF1.
You can change this pin configuration by editing config_pjrc.h.
In this photo Vcc is yellow, GND is green, Data is red and Clock is black.
http://img17.imageshack.us/img17/7243/201101181933.jpg
For c. USART implementation:
In case of Teensny(ATMega32u4) CLock is on PD2 and Data on PD5.
Build Frimware
--------------
1. Edit Makefile for build options and MCU setting.
Use 'atmega32u4' for Teensy 2.0 or 'at90usb1286' for Teensy++ 2.0.
Use 'atmega32u4' for Teensy 2.0 or 'at90usb1286' for Teensy++ 2.0.
2. make
Just type 'make' in a terminal.
Just type 'make' in a terminal.
Use '-f Makefile.pjrc_intr' option to use b. Interrupt.
Use '-f Makefile.pjrc_usart' option to use c. USART.
Use '-f Makefile.vusb' option to build V-USB converter.
3. program with Teensy Loader.
http://www.pjrc.com/teensy/loader.html
http://www.pjrc.com/teensy/loader.html
Demonstration of Features
@ -97,34 +113,4 @@ To define keymap layer switching may needs a bit of your effort at this time.
),
Multimedia keys
---------------
Following lists PS/2 special keys supported by Windows.
http://msdn.microsoft.com/en-us/windows/hardware/gg463372.aspx
Key PS/2(Set2) HID
---------------------------------------------------
System Power E0 37 01 0081
System Sleep E0 3F 01 0082
System Wake E0 5E 01 0083
System Mute E0 23 0C 00E2
Volume Up E0 32 0C 00E9
Volume Down E0 21 0C 00EA
Scan Next Track E0 4D 0C 00B5
Scan Previous Track E0 15 0C 00B6
Stop E0 3B 0C 00B7
Play/Pause E0 34 0C 00CD
Media Select E0 50 0C 0183
Mail E0 48 0C 018A
Calculator E0 2B 0C 0192
My Computer E0 40 0C 0194
WWW Search E0 10 0C 0221
WWW Home E0 3A 0C 0223
WWW Back E0 38 0C 0224
WWW Forward E0 30 0C 0225
WWW Stop E0 28 0C 0226
WWW Refresh E0 20 0C 0227
WWW Favorites E0 18 0C 022A
EOF