From 64c29e28e0efa184319f7831b3eca18c7f73f7d0 Mon Sep 17 00:00:00 2001
From: Uwe Hermann <uwe@hermann-uwe.de>
Date: Sun, 15 Jan 2012 15:36:01 +0100
Subject: srd: Each PD now has its own subdirectory.

---
 decoders/nunchuk/nunchuk.py | 144 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 decoders/nunchuk/nunchuk.py

(limited to 'decoders/nunchuk/nunchuk.py')

diff --git a/decoders/nunchuk/nunchuk.py b/decoders/nunchuk/nunchuk.py
new file mode 100644
index 0000000..46bf53c
--- /dev/null
+++ b/decoders/nunchuk/nunchuk.py
@@ -0,0 +1,144 @@
+##
+## 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):
+    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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