forked from google/mozc-devices
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathReadme.txt
106 lines (75 loc) · 2.97 KB
/
Readme.txt
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
Copyright 2013 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 firmware of split-flap display input device for
Google Japanese Input.
=====================================
Files
=====================================
* V-USB library files
../third_party/usbdrv/
The directory and files were 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
flap.c
usbconfig.h
usb_keyboard.c
usb_keyboard.h
=====================================
Building & Writing Firmware
=====================================
* Building firmware binaries
AVR-gcc is required.
$ make hex
* Writing to the program memory
Please refer documents of AVR programmer device you use.
Makefile contains "flash" rule 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.
==================
References
==================
The firmware and circuit diagram has been developed based on V-USB.
* V-USB
http://www.obdev.at/vusb/