Add Python decoder for the Wii Nunchuk.

Untested, unfinished.

diff --git a/scripts/Makefile.am b/scripts/Makefile.am
index 2372ff255a3e1b16405c61c1ae2f944dcd12730b..ae4a3c8d6685f3b516a143c72fe70fde42d7c889 100644 (file)
--- a/scripts/Makefile.am
+++ b/scripts/Makefile.am
@@ -18,5 +18,5 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
-dist_pkgdata_SCRIPTS = i2c.py transitioncounter.py
+dist_pkgdata_SCRIPTS = i2c.py nunchuk.py transitioncounter.py
 

diff --git a/scripts/nunchuk.py b/scripts/nunchuk.py
new file mode 100644 (file)
index 0000000..409e120
--- /dev/null
+++ b/scripts/nunchuk.py
@@ -0,0 +1,157 @@
+##
+## 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',
+               'desc': 'Nintendo Wii Nunchuk decoder',
+               'inputformats': ['i2c'],
+               'ouputformats': ['nunchuk'],
+       }
+
+# Use psyco (if available) as it results in huge performance improvements.
+try:
+       import psyco
+       psyco.bind(decode)
+except ImportError:
+       pass
+