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1 | ## | |
2 | ## This file is part of the sigrok project. | |
3 | ## | |
4 | ## Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | ## | |
6 | ## This program is free software; you can redistribute it and/or modify | |
7 | ## it under the terms of the GNU General Public License as published by | |
8 | ## the Free Software Foundation; either version 2 of the License, or | |
9 | ## (at your option) any later version. | |
10 | ## | |
11 | ## This program is distributed in the hope that it will be useful, | |
12 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ## GNU General Public License for more details. | |
15 | ## | |
16 | ## You should have received a copy of the GNU General Public License | |
17 | ## along with this program; if not, write to the Free Software | |
18 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | ## | |
20 | ||
21 | # | |
22 | # Nintendo Wii Nunchuk decoder | |
23 | # | |
24 | ||
25 | # | |
26 | # TODO: Description | |
27 | # | |
28 | # http://wiibrew.org/wiki/Wiimote/Extension_Controllers/Nunchuck | |
29 | # http://todbot.com/blog/2008/02/18/wiichuck-wii-nunchuck-adapter-available/ | |
30 | # https://www.sparkfun.com/products/9281 | |
31 | # | |
32 | ||
33 | import sigrok | |
34 | ||
35 | # States | |
36 | IDLE = 0 | |
37 | START = 1 | |
38 | NUNCHUK_SLAVE = 2 | |
39 | INIT = 3 | |
40 | INITIALIZED = 4 | |
41 | ||
42 | # FIXME: This is just some example input for testing purposes... | |
43 | example_packets = [ | |
44 | # START condition. | |
45 | {'type': 'S', 'range': (10, 11), 'data': None, 'ann': ''}, | |
46 | ||
47 | # Nunchuk init: Write 0x40,0x00 to slave address 0x54. | |
48 | {'type': 'AW', 'range': (12, 13), 'data': 0x54, 'ann': ''}, | |
49 | {'type': 'DW', 'range': (14, 15), 'data': 0x40, 'ann': ''}, | |
50 | {'type': 'AW', 'range': (16, 17), 'data': 0x54, 'ann': ''}, | |
51 | {'type': 'DW', 'range': (18, 19), 'data': 0x00, 'ann': ''}, | |
52 | ||
53 | # Get data: Read 6 bytes of data. | |
54 | {'type': 'DR', 'range': (20, 21), 'data': 0x11, 'ann': ''}, | |
55 | {'type': 'DR', 'range': (22, 23), 'data': 0x22, 'ann': ''}, | |
56 | {'type': 'DR', 'range': (24, 25), 'data': 0x33, 'ann': ''}, | |
57 | {'type': 'DR', 'range': (26, 27), 'data': 0x44, 'ann': ''}, | |
58 | {'type': 'DR', 'range': (28, 29), 'data': 0x55, 'ann': ''}, | |
59 | {'type': 'DR', 'range': (30, 31), 'data': 0x66, 'ann': ''}, | |
60 | ||
61 | # STOP condition. | |
62 | {'type': 'P', 'range': (32, 33), 'data': None, 'ann': ''}, | |
63 | ] | |
64 | ||
65 | class Sample(): | |
66 | def __init__(self, data): | |
67 | self.data = data | |
68 | def probe(self, probe): | |
69 | s = ord(self.data[probe / 8]) & (1 << (probe % 8)) | |
70 | return True if s else False | |
71 | ||
72 | def sampleiter(data, unitsize): | |
73 | for i in range(0, len(data), unitsize): | |
74 | yield(Sample(data[i:i+unitsize])) | |
75 | ||
76 | class Decoder(sigrok.Decoder): | |
77 | id = 'nunchuk' | |
78 | name = 'Nunchuk' | |
79 | longname = 'Nintendo Wii Nunchuk decoder' | |
80 | desc = 'Decodes the Nintendo Wii Nunchuk I2C-based protocol.' | |
81 | longdesc = '...' | |
82 | author = 'Uwe Hermann' | |
83 | email = 'uwe@hermann-uwe.de' | |
84 | license = 'gplv2+' | |
85 | inputs = ['i2c'] | |
86 | outputs = ['nunchuck'] | |
87 | probes = {} | |
88 | options = {} | |
89 | ||
90 | def __init__(self, **kwargs): | |
91 | self.probes = Decoder.probes.copy() | |
92 | ||
93 | # TODO: Don't hardcode the number of channels. | |
94 | self.channels = 8 | |
95 | ||
96 | self.state = IDLE # TODO: Can we assume a certain initial state? | |
97 | ||
98 | self.sx = self.sy = self.ax = self.ay = self.az = self.bz = self.bc = 0 | |
99 | ||
100 | self.databytecount = 0 | |
101 | ||
102 | def start(self, metadata): | |
103 | self.unitsize = metadata['unitsize'] | |
104 | ||
105 | def report(self): | |
106 | pass | |
107 | ||
108 | def decode(self, data): | |
109 | """Nintendo Wii Nunchuk decoder""" | |
110 | ||
111 | out = [] | |
112 | o = {} | |
113 | ||
114 | # We should accept a list of samples and iterate... | |
115 | # for sample in sampleiter(data['data'], self.unitsize): | |
116 | for p in example_packets: | |
117 | ||
118 | # TODO: Eliminate the need for ord(). | |
119 | # s = ord(sample.data) | |
120 | ||
121 | if p['type'] == 'S': # TODO: Handle 'Sr' here, too? | |
122 | self.state = START | |
123 | ||
124 | elif p['type'] == 'Sr': | |
125 | pass # FIXME | |
126 | ||
127 | elif p['type'] == 'AR': | |
128 | # TODO: Error/Warning, not supported, I think. | |
129 | pass | |
130 | ||
131 | elif p['type'] == 'AW': | |
132 | # The Wii Nunchuk always has slave address 0x54. | |
133 | # TODO: Handle this stuff more correctly. | |
134 | if p['data'] == 0x54: | |
135 | pass # TODO | |
136 | else: | |
137 | pass # TODO: What to do here? Ignore? Error? | |
138 | ||
139 | elif p['type'] == 'DR' and self.state == INITIALIZED: | |
140 | if self.databytecount == 0: | |
141 | self.sx = p['data'] | |
142 | elif self.databytecount == 1: | |
143 | self.sy = p['data'] | |
144 | elif self.databytecount == 2: | |
145 | self.ax = p['data'] << 2 | |
146 | elif self.databytecount == 3: | |
147 | self.ay = p['data'] << 2 | |
148 | elif self.databytecount == 4: | |
149 | self.az = p['data'] << 2 | |
150 | elif self.databytecount == 5: | |
151 | self.bz = (p['data'] & (1 << 0)) >> 0 | |
152 | self.bc = (p['data'] & (1 << 1)) >> 1 | |
153 | self.ax |= (p['data'] & (3 << 2)) >> 2 | |
154 | self.ay |= (p['data'] & (3 << 4)) >> 4 | |
155 | self.az |= (p['data'] & (3 << 6)) >> 6 | |
156 | # del o | |
157 | o = {'type': 'D', 'range': (0, 0), 'data': []} | |
158 | o['data'] = [self.sx, self.sy, self.ax, self.ay, \ | |
159 | self.az, self.bz, self.bc] | |
160 | # sx = sy = ax = ay = az = bz = bc = 0 | |
161 | else: | |
162 | pass # TODO | |
163 | ||
164 | if 0 <= self.databytecount <= 5: | |
165 | self.databytecount += 1 | |
166 | ||
167 | # TODO: If 6 bytes read -> save and reset | |
168 | ||
169 | # TODO | |
170 | elif p['type'] == 'DR' and self.state != INITIALIZED: | |
171 | pass | |
172 | ||
173 | elif p['type'] == 'DW': | |
174 | if p['data'] == 0x40 and self.state == START: | |
175 | self.state = INIT | |
176 | elif p['data'] == 0x00 and self.state == INIT: | |
177 | o = {'type': 'I', 'range': (0, 0), 'data': []} | |
178 | o['data'] = [0x40, 0x00] | |
179 | out.append(o) | |
180 | self.state = INITIALIZED | |
181 | else: | |
182 | pass # TODO | |
183 | ||
184 | elif p['type'] == 'P': | |
185 | out.append(o) | |
186 | self.state = INITIALIZED | |
187 | self.databytecount = 0 | |
188 | ||
189 | self.put(out) | |
190 |