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.
+This firmware converts PS/2 keyboard protocol to USB and supports only Scan Code Set 2.
+This will works on USB AVR(ATMega32U4, AT90USB) or V-USB(ATMega168, 328...).
Features
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
----------------
-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 PD5 and Data on PD2.
+a. Simple and stupid busy-wait(ps2.c)
+ This is expected to implemented with portable C code for reference.
+b. Interrupt driven(ps2.c)
+ Uses external interrupt to detect falling edge of clock line.
+c. USART hardware module(ps2_usart.c)
+ Uses AVR USART engine to recevie PS/2 signal. Recomended and default.
+ This is required to work with V-USB, preceding two methods tend to
+ miss signal edges while V-USB handles USB.
+
+To select method edit Makefile.
+
+
+Connect Wires
+-------------
+In case of Teensy2.0(ATMega32U4):
+0. Connect Vcc and GND.
+1. Connect Clock and Data line.
+ For a. Clock is on PF0 and Data on PF1.
+ For b. Clock is on PD1 and Data on PD2.
+ For c. Clock is on PD5 and Data on PD2.
+2. Optionally you need pull-up register. 1K-10K Ohm is OK.
+
+To change pin configuration edit config.h.
Build Frimware
1. Edit Makefile for build options and MCU setting.
Use 'atmega32u4' for Teensy 2.0 or 'at90usb1286' for Teensy++ 2.0.
2. make
- 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
+ Just type `make` in a terminal.
+ Use `-f Makefile.vusb` option to build V-USB converter.
+ Use `-f Makefile.jis` option to use JIS keyboard.
+3. program MCU.
+ In case of Teensy use `Teensy Loader`.(http://www.pjrc.com/teensy/loader.html)
+ Otherwise you want to use `avrdude` or `dfu-programmer`.
Demonstration of Features
Keymap
------
-You can change a keymap by editing code of keymap.c like following.
-How to define the keymap is probably obvious. You can find key symbols in usb_keycodes.h.
-To define keymap layer switching may needs a bit of your effort at this time.
-
- /* Default Layer: plain keymap
- * ,---. ,---------------. ,---------------. ,---------------. ,-----------. ,-----------.
- * |Esc| |F1 |F2 |F3 |F4 | |F5 |F6 |F7 |F8 | |F9 |F10|F11|F12| |PrS|ScL|Pau| |Pwr|Slp|Wak|
- * `---' `---------------' `---------------' `---------------' `-----------' `-----------'
- * ,-----------------------------------------------------------. ,-----------. ,---------------.
- * | `| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =|Backspa| |Ins|Hom|PgU| |NmL| /| *| -|
- * |-----------------------------------------------------------| |-----------| |---------------|
- * |Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]| \| |Del|End|PgD| | 7| 8| 9| |
- * |-----------------------------------------------------------| `-----------' |-----------| +|
- * |CapsLo| A| S| D| F| G| H| J| K| L| ;| '|Return | | 4| 5| 6| |
- * |-----------------------------------------------------------| ,---. |---------------|
- * |Shift | Z| X| C| V| B| N| M| ,| ,| /|Shift | |Up | | 1| 2| 3| |
- * |-----------------------------------------------------------| ,-----------. |-----------|Ent|
- * |Ctrl |Gui |Alt | Space |Alt |Gui |Menu|Ctrl| |Lef|Dow|Rig| | 0| .| |
- * `-----------------------------------------------------------' `-----------' `---------------'
- */
- KEYMAP(
- ESC, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, PSCR,SLCK,BRK, PWR, F13, F14,
- GRV, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, MINS,EQL, BSPC, INS, HOME,PGUP, NLCK,PSLS,PAST,PMNS,
- TAB, Q, W, E, R, T, Y, U, I, O, P, LBRC,RBRC,BSLS, DEL, END, PGDN, P7, P8, P9,
- CAPS,A, S, D, F, G, H, J, K, L, SCLN,QUOT, ENT, P4, P5, P6, PPLS,
- LSFT,Z, X, C, V, B, N, M, COMM,DOT, SLSH, RSFT, UP, P1, P2, P3,
- LCTL,LGUI,LALT, SPC, RALT,RGUI,APP, RCTL, LEFT,DOWN,RGHT, P0, PDOT,PENT
- ),
+You can change a keymap by editing code of keymap. See common/keycode.h for key symbols.
+
+
+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)
EOF
projects / tmk_firmware.git / blobdiff