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##
## This file is part of the sigrok project.
##
## Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
##
## 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 St, Fifth Floor, Boston, MA 02110-1301 USA
##
#
# Nintendo Wii Nunchuk decoder
#
#
# TODO: Description
#
# http://wiibrew.org/wiki/Wiimote/Extension_Controllers/Nunchuck
# http://todbot.com/blog/2008/02/18/wiichuck-wii-nunchuck-adapter-available/
# https://www.sparkfun.com/products/9281
#
import sigrokdecode as srd
# States
IDLE = 0
START = 1
NUNCHUK_SLAVE = 2
INIT = 3
INITIALIZED = 4
class Decoder(srd.Decoder):
api_version = 1
id = 'nunchuk'
name = 'Nunchuk'
longname = 'Nintendo Wii Nunchuk'
desc = 'Decodes the Nintendo Wii Nunchuk I2C-based protocol.'
longdesc = '...'
license = 'gplv2+'
inputs = ['i2c']
outputs = ['nunchuck']
probes = [] # TODO
options = {}
annotations = [
['TODO', 'TODO'],
]
def __init__(self, **kwargs):
self.state = IDLE # TODO: Can we assume a certain initial state?
self.sx = self.sy = self.ax = self.ay = self.az = self.bz = self.bc = 0
self.databytecount = 0
def start(self, metadata):
# self.out_proto = self.add(srd.OUTPUT_PROTO, 'nunchuk')
self.out_ann = self.add(srd.OUTPUT_ANN, 'nunchuk')
def report(self):
pass
def decode(self, ss, es, data):
cmd, databyte, ack_bit = data
if cmd == 'START': # TODO: Handle 'Sr' here, too?
self.state = START
elif cmd == 'START REPEAT':
pass # FIXME
elif cmd == 'ADDRESS READ':
# TODO: Error/Warning, not supported, I think.
pass
elif cmd == 'ADDRESS WRITE':
# The Wii Nunchuk always has slave address 0x54.
# TODO: Handle this stuff more correctly.
if databyte == 0x54:
pass # TODO
else:
pass # TODO: What to do here? Ignore? Error?
elif cmd == 'DATA READ' and self.state == INITIALIZED:
if self.databytecount == 0:
self.sx = databyte
elif self.databytecount == 1:
self.sy = databyte
elif self.databytecount == 2:
self.ax = databyte << 2
elif self.databytecount == 3:
self.ay = databyte << 2
elif self.databytecount == 4:
self.az = databyte << 2
elif self.databytecount == 5:
self.bz = (databyte & (1 << 0)) >> 0
self.bc = (databyte & (1 << 1)) >> 1
self.ax |= (databyte & (3 << 2)) >> 2
self.ay |= (databyte & (3 << 4)) >> 4
self.az |= (databyte & (3 << 6)) >> 6
d = 'sx = 0x%02x, sy = 0x%02x, ax = 0x%02x, ay = 0x%02x, ' \
'az = 0x%02x, bz = 0x%02x, bc = 0x%02x' % (self.sx, \
self.sy, self.ax, self.ay, self.az, self.bz, self.bc)
self.put(ss, es, self.out_ann, [0, [d]])
self.sx = self.sy = self.ax = self.ay = self.az = 0
self.bz = self.bc = 0
else:
pass # TODO
if 0 <= self.databytecount <= 5:
self.databytecount += 1
# TODO: If 6 bytes read -> save and reset
# TODO
elif cmd == 'DATA READ' and self.state != INITIALIZED:
pass
elif cmd == 'DATA WRITE':
if self.state == IDLE:
self.state = INITIALIZED
return
if databyte == 0x40 and self.state == START:
self.state = INIT
elif databyte == 0x00 and self.state == INIT:
self.put(ss, es, self.out_ann, [0, ['Initialize nunchuk']])
self.state = INITIALIZED
else:
pass # TODO
elif cmd == 'STOP':
self.state = INITIALIZED
self.databytecount = 0
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