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1 | ## | |
2 | ## This file is part of the sigrok project. | |
3 | ## | |
4 | ## Copyright (C) 2010-2012 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 | # Nintendo Wii Nunchuk protocol decoder | |
22 | ||
23 | import sigrokdecode as srd | |
24 | ||
25 | # States | |
26 | IDLE = 0 | |
27 | START = 1 | |
28 | NUNCHUK_SLAVE = 2 | |
29 | INIT = 3 | |
30 | INITIALIZED = 4 | |
31 | ||
32 | class Decoder(srd.Decoder): | |
33 | api_version = 1 | |
34 | id = 'nunchuk' | |
35 | name = 'Nunchuk' | |
36 | longname = 'Nintendo Wii Nunchuk' | |
37 | desc = 'Decodes the Nintendo Wii Nunchuk I2C-based protocol.' | |
38 | longdesc = '...' | |
39 | license = 'gplv2+' | |
40 | inputs = ['i2c'] | |
41 | outputs = ['nunchuck'] | |
42 | probes = [] | |
43 | optional_probes = [] # TODO | |
44 | options = {} | |
45 | annotations = [ | |
46 | ['TODO', 'TODO'], | |
47 | ] | |
48 | ||
49 | def __init__(self, **kwargs): | |
50 | self.state = IDLE # TODO: Can we assume a certain initial state? | |
51 | self.sx = self.sy = self.ax = self.ay = self.az = self.bz = self.bc = 0 | |
52 | self.databytecount = 0 | |
53 | ||
54 | def start(self, metadata): | |
55 | # self.out_proto = self.add(srd.OUTPUT_PROTO, 'nunchuk') | |
56 | self.out_ann = self.add(srd.OUTPUT_ANN, 'nunchuk') | |
57 | ||
58 | def report(self): | |
59 | pass | |
60 | ||
61 | def decode(self, ss, es, data): | |
62 | ||
63 | cmd, databyte, ack_bit = data | |
64 | ||
65 | if cmd == 'START': # TODO: Handle 'Sr' here, too? | |
66 | self.state = START | |
67 | ||
68 | elif cmd == 'START REPEAT': | |
69 | pass # FIXME | |
70 | ||
71 | elif cmd == 'ADDRESS READ': | |
72 | # TODO: Error/Warning, not supported, I think. | |
73 | pass | |
74 | ||
75 | elif cmd == 'ADDRESS WRITE': | |
76 | # The Wii Nunchuk always has slave address 0x54. | |
77 | # TODO: Handle this stuff more correctly. | |
78 | if databyte == 0x54: | |
79 | pass # TODO | |
80 | else: | |
81 | pass # TODO: What to do here? Ignore? Error? | |
82 | ||
83 | elif cmd == 'DATA READ' and self.state == INITIALIZED: | |
84 | if self.databytecount == 0: | |
85 | self.sx = databyte | |
86 | elif self.databytecount == 1: | |
87 | self.sy = databyte | |
88 | elif self.databytecount == 2: | |
89 | self.ax = databyte << 2 | |
90 | elif self.databytecount == 3: | |
91 | self.ay = databyte << 2 | |
92 | elif self.databytecount == 4: | |
93 | self.az = databyte << 2 | |
94 | elif self.databytecount == 5: | |
95 | self.bz = (databyte & (1 << 0)) >> 0 | |
96 | self.bc = (databyte & (1 << 1)) >> 1 | |
97 | self.ax |= (databyte & (3 << 2)) >> 2 | |
98 | self.ay |= (databyte & (3 << 4)) >> 4 | |
99 | self.az |= (databyte & (3 << 6)) >> 6 | |
100 | ||
101 | d = 'sx = 0x%02x, sy = 0x%02x, ax = 0x%02x, ay = 0x%02x, ' \ | |
102 | 'az = 0x%02x, bz = 0x%02x, bc = 0x%02x' % (self.sx, \ | |
103 | self.sy, self.ax, self.ay, self.az, self.bz, self.bc) | |
104 | self.put(ss, es, self.out_ann, [0, [d]]) | |
105 | ||
106 | self.sx = self.sy = self.ax = self.ay = self.az = 0 | |
107 | self.bz = self.bc = 0 | |
108 | else: | |
109 | pass # TODO | |
110 | ||
111 | if 0 <= self.databytecount <= 5: | |
112 | self.databytecount += 1 | |
113 | ||
114 | # TODO: If 6 bytes read -> save and reset | |
115 | ||
116 | # TODO | |
117 | elif cmd == 'DATA READ' and self.state != INITIALIZED: | |
118 | pass | |
119 | ||
120 | elif cmd == 'DATA WRITE': | |
121 | if self.state == IDLE: | |
122 | self.state = INITIALIZED | |
123 | return | |
124 | ||
125 | if databyte == 0x40 and self.state == START: | |
126 | self.state = INIT | |
127 | elif databyte == 0x00 and self.state == INIT: | |
128 | self.put(ss, es, self.out_ann, [0, ['Initialize nunchuk']]) | |
129 | self.state = INITIALIZED | |
130 | else: | |
131 | pass # TODO | |
132 | ||
133 | elif cmd == 'STOP': | |
134 | self.state = INITIALIZED | |
135 | self.databytecount = 0 | |
136 |