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##
## This file is part of the sigrok project.
##
## Copyright (C) 2010 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
# FIXME: This is just some example input for testing purposes...
example_packets = [
# START condition.
{'type': 'S', 'range': (10, 11), 'data': None, 'ann': ''},
# Nunchuk init: Write 0x40,0x00 to slave address 0x54.
{'type': 'AW', 'range': (12, 13), 'data': 0x54, 'ann': ''},
{'type': 'DW', 'range': (14, 15), 'data': 0x40, 'ann': ''},
{'type': 'AW', 'range': (16, 17), 'data': 0x54, 'ann': ''},
{'type': 'DW', 'range': (18, 19), 'data': 0x00, 'ann': ''},
# Get data: Read 6 bytes of data.
{'type': 'DR', 'range': (20, 21), 'data': 0x11, 'ann': ''},
{'type': 'DR', 'range': (22, 23), 'data': 0x22, 'ann': ''},
{'type': 'DR', 'range': (24, 25), 'data': 0x33, 'ann': ''},
{'type': 'DR', 'range': (26, 27), 'data': 0x44, 'ann': ''},
{'type': 'DR', 'range': (28, 29), 'data': 0x55, 'ann': ''},
{'type': 'DR', 'range': (30, 31), 'data': 0x66, 'ann': ''},
# STOP condition.
{'type': 'P', 'range': (32, 33), 'data': None, 'ann': ''},
]
class Decoder(srd.Decoder):
id = 'nunchuk'
name = 'Nunchuk'
longname = 'Nintendo Wii Nunchuk decoder'
desc = 'Decodes the Nintendo Wii Nunchuk I2C-based protocol.'
longdesc = '...'
author = 'Uwe Hermann'
email = 'uwe@hermann-uwe.de'
license = 'gplv2+'
inputs = ['i2c']
outputs = ['nunchuck']
probes = [] # TODO
options = {}
annotations = []
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):
out = []
o = {}
# We should accept a list of samples and iterate...
for p in example_packets: # TODO
# TODO: Eliminate the need for ord().
# s = ord(sample.data)
if p['type'] == 'S': # TODO: Handle 'Sr' here, too?
self.state = START
elif p['type'] == 'Sr':
pass # FIXME
elif p['type'] == 'AR':
# TODO: Error/Warning, not supported, I think.
pass
elif p['type'] == 'AW':
# The Wii Nunchuk always has slave address 0x54.
# TODO: Handle this stuff more correctly.
if p['data'] == 0x54:
pass # TODO
else:
pass # TODO: What to do here? Ignore? Error?
elif p['type'] == 'DR' and self.state == INITIALIZED:
if self.databytecount == 0:
self.sx = p['data']
elif self.databytecount == 1:
self.sy = p['data']
elif self.databytecount == 2:
self.ax = p['data'] << 2
elif self.databytecount == 3:
self.ay = p['data'] << 2
elif self.databytecount == 4:
self.az = p['data'] << 2
elif self.databytecount == 5:
self.bz = (p['data'] & (1 << 0)) >> 0
self.bc = (p['data'] & (1 << 1)) >> 1
self.ax |= (p['data'] & (3 << 2)) >> 2
self.ay |= (p['data'] & (3 << 4)) >> 4
self.az |= (p['data'] & (3 << 6)) >> 6
# del o
o = {'type': 'D', 'range': (0, 0), 'data': []}
o['data'] = [self.sx, self.sy, self.ax, self.ay, \
self.az, self.bz, self.bc]
# sx = sy = ax = ay = az = bz = bc = 0
else:
pass # TODO
if 0 <= self.databytecount <= 5:
self.databytecount += 1
# TODO: If 6 bytes read -> save and reset
# TODO
elif p['type'] == 'DR' and self.state != INITIALIZED:
pass
elif p['type'] == 'DW':
if p['data'] == 0x40 and self.state == START:
self.state = INIT
elif p['data'] == 0x00 and self.state == INIT:
o = {'type': 'I', 'range': (0, 0), 'data': []}
o['data'] = [0x40, 0x00]
out.append(o)
self.state = INITIALIZED
else:
pass # TODO
elif p['type'] == 'P':
out.append(o)
self.state = INITIALIZED
self.databytecount = 0
if out != []:
# self.put(0, 0, self.out_proto, out_proto)
self.put(0, 0, self.out_ann, out)
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