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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
# 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': ''},
]
def decode(inbuf):
"""Nintendo Wii Nunchuk decoder"""
# FIXME: Get the data in the correct format in the first place.
inbuf = [ord(x) for x in inbuf]
out = []
o = {}
# TODO: Pass in metadata.
# States
IDLE, START, NUNCHUK_SLAVE, INIT, INITIALIZED = range(5)
state = IDLE # TODO: Can we assume a certain initial state?
sx = sy = ax = ay = az = bz = bc = 0
databytecount = 0
# Loop over all I2C packets.
for p in example_packets:
if p['type'] == 'S': # TODO: Handle 'Sr' here, too?
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 state == INITIALIZED:
if databytecount == 0:
sx = p['data']
elif databytecount == 1:
sy = p['data']
elif databytecount == 2:
ax = p['data'] << 2
elif databytecount == 3:
ay = p['data'] << 2
elif databytecount == 4:
az = p['data'] << 2
elif databytecount == 5:
bz = (p['data'] & (1 << 0)) >> 0
bc = (p['data'] & (1 << 1)) >> 1
ax |= (p['data'] & (3 << 2)) >> 2
ay |= (p['data'] & (3 << 4)) >> 4
az |= (p['data'] & (3 << 6)) >> 6
# del o
o = {'type': 'D', 'range': (0, 0), 'data': []}
o['data'] = [sx, sy, ax, ay, az, bz, bc]
# sx = sy = ax = ay = az = bz = bc = 0
else:
pass # TODO
if 0 <= databytecount <= 5:
databytecount += 1
# TODO: If 6 bytes read -> save and reset
# TODO
elif p['type'] == 'DR' and state != INITIALIZED:
pass
elif p['type'] == 'DW':
if p['data'] == 0x40 and state == START:
state = INIT
elif p['data'] == 0x00 and state == INIT:
o = {'type': 'I', 'range': (0, 0), 'data': []}
o['data'] = [0x40, 0x00]
out.append(o)
state = INITIALIZED
else:
pass # TODO
elif p['type'] == 'P':
out.append(o)
state = INITIALIZED
databytecount = 0
print out
# FIXME
return ''
def register():
return {
'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+',
'in': ['i2c'],
'out': ['nunchuck'],
'probes': [
# TODO
],
'options': {
# TODO
},
# 'start': start,
# 'report': report,
}
# Use psyco (if available) as it results in huge performance improvements.
try:
import psyco
psyco.bind(decode)
except ImportError:
pass
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