2 ## This file is part of the sigrok project.
4 ## Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
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.
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.
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
21 # Nintendo Wii Nunchuk protocol decoder
23 import sigrokdecode as srd
25 class Decoder(srd.Decoder):
29 longname = 'Nintendo Wii Nunchuk'
30 desc = 'Decodes the Nintendo Wii Nunchuk I2C-based protocol.'
34 outputs = ['nunchuck']
36 optional_probes = [] # TODO
42 def __init__(self, **kwargs):
43 self.state = 'IDLE' # TODO: Can we assume a certain initial state?
44 self.sx = self.sy = self.ax = self.ay = self.az = self.bz = self.bc = 0
45 self.databytecount = 0
47 def start(self, metadata):
48 # self.out_proto = self.add(srd.OUTPUT_PROTO, 'nunchuk')
49 self.out_ann = self.add(srd.OUTPUT_ANN, 'nunchuk')
54 def decode(self, ss, es, data):
58 if cmd == 'START': # TODO: Handle 'Sr' here, too?
61 elif cmd == 'START REPEAT':
64 elif cmd == 'ADDRESS READ':
65 # TODO: Error/Warning, not supported, I think.
68 elif cmd == 'ADDRESS WRITE':
69 # The Wii Nunchuk always has slave address 0x54.
70 # TODO: Handle this stuff more correctly.
74 pass # TODO: What to do here? Ignore? Error?
76 elif cmd == 'DATA READ' and self.state == 'INITIALIZED':
77 if self.databytecount == 0:
79 elif self.databytecount == 1:
81 elif self.databytecount == 2:
82 self.ax = databyte << 2
83 elif self.databytecount == 3:
84 self.ay = databyte << 2
85 elif self.databytecount == 4:
86 self.az = databyte << 2
87 elif self.databytecount == 5:
88 self.bz = (databyte & (1 << 0)) >> 0
89 self.bc = (databyte & (1 << 1)) >> 1
90 self.ax |= (databyte & (3 << 2)) >> 2
91 self.ay |= (databyte & (3 << 4)) >> 4
92 self.az |= (databyte & (3 << 6)) >> 6
94 d = 'sx = 0x%02x, sy = 0x%02x, ax = 0x%02x, ay = 0x%02x, ' \
95 'az = 0x%02x, bz = 0x%02x, bc = 0x%02x' % (self.sx, \
96 self.sy, self.ax, self.ay, self.az, self.bz, self.bc)
97 self.put(ss, es, self.out_ann, [0, [d]])
99 self.sx = self.sy = self.ax = self.ay = self.az = 0
100 self.bz = self.bc = 0
104 if 0 <= self.databytecount <= 5:
105 self.databytecount += 1
107 # TODO: If 6 bytes read -> save and reset
110 elif cmd == 'DATA READ' and self.state != 'INITIALIZED':
113 elif cmd == 'DATA WRITE':
114 if self.state == 'IDLE':
115 self.state = 'INITIALIZED'
118 if databyte == 0x40 and self.state == 'START':
120 elif databyte == 0x00 and self.state == 'INIT':
121 self.put(ss, es, self.out_ann, [0, ['Initialize nunchuk']])
122 self.state = 'INITIALIZED'
127 self.state = 'INITIALIZED'
128 self.databytecount = 0