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Readme.txt
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Readme.txt
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Copyright 2012 Google Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
=====================================
Summary
=====================================
Circuit diagram and firmwares of Morse key for Google Japanese Input.
=====================================
Files
=====================================
* V-USB library files
third_party/usbdrv/
This directory and files are copied from V-USB files available at
http://www.obdev.at/vusb/
* Documents
COPYING ...... Open Source license for this software.
Readme.txt ... The file you are currently reading.
* Circuit diagram
circuit.png
* Firmware source codes
Makefile
dit-dah.c
space.c
usbconfig.h
usb_keyboard.c
usb_keyboard.h
* Romaji table for Google Japanese Input
romaji_dit-dah.txt
=====================================
Building & Writing Firmware
=====================================
* Building firmware binariese
AVR-gcc is required.
$ make hex
* Writing to the program memory
Choose one of the HEX files to write.
- space.hex: Sends space key as the button is pressed.
- dit-dah.hex: Sends dits, dahs.
Please refer documents of AVR programmer device you use.
Makefile contains "flash_space" and "flash_dit-dah" rules that writes
a hex file using Avrdude as an example.
* Programming the fuse bits
Fuse bits must be configured in order to run the firmware correctly.
lower byte: 0xef
higher byte: 0xdb
# ATTiny2313 FUSE_L (Fuse low byte):
# 0xef = 1 1 1 0 1 1 1 1
# ^ ^ \+/ \--+--/
# | | | +------- CKSEL 3..0 (clock selection -> crystal @ 12 MHz)
# | | +--------------- SUT 1..0 (BOD enabled, fast rising power)
# | +------------------ CKOUT (clock output on CKOUT pin -> disabled)
# +-------------------- CKDIV8 (divide clock by 8 -> don't divide)
# ATTiny2313 FUSE_H (Fuse high byte):
# 0xdb = 1 1 0 1 1 0 1 1
# ^ ^ ^ ^ \-+-/ ^
# | | | | | +---- RSTDISBL (disable external reset -> enabled)
# | | | | +-------- BODLEVEL 2..0 (brownout trigger level -> 2.7V)
# | | | +-------------- WDTON (watchdog timer always on -> disable)
# | | +---------------- SPIEN (enable serial programming -> enabled)
# | +------------------ EESAVE (preserve EEPROM on Chip Erase
# | -> not preserved)
# +-------------------- DWEN (debug wire enable)
Makefile contains "fuse" rule that programs fuse bits using Avrdude as an
example.
===================================================
Using dit-dah firmware with Google Japanese Input
===================================================
"dit-dah" firmware is intended to be combined with Google Japanese Input, whose
romaji table is configured by "romaji_dit-dah.txt".
Note: This process will overwrite existing romaji table.
If you have customized the romaji table, you should backup your data first.
1. Open Properties
2. Press "Customize..." button
3. Open "Edit - Inport from file..."
4. Open "romaji_dit-dah.txt" in this directory
==================
References
==================
The firmware and circuit diagram has been developed based on V-USB.
* V-USB
http://www.obdev.at/vusb/