Add initial Renesas Advanced User Debugger (AUD) decoder.

2 files changed, 146 insertions, 0 deletions

diff --git a/decoders/aud/__init__.py b/decoders/aud/__init__.py
new file mode 100644
index 0000000..aaa31ff
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+++ b/decoders/aud/__init__.py
@@ -0,0 +1,32 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2016 fenugrec <fenugrec users.sourceforge.net>
+##
+## 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
+##
+
+'''
+This protocol decoder decodes the AUD (Advanced User Debugger) interface
+of certain Renesas / Hitachi microcontrollers, when set in Branch Trace mode.
+
+AUD has two modes, this PD currently only supports "Branch Trace" mode.
+
+Details:
+http://www.renesas.eu/products/mpumcu/superh/sh7050/sh7058/Documentation.jsp
+("rej09b0046 - SH7058 Hardware manual")
+'''
+
+from .pd import Decoder
diff --git a/decoders/aud/pd.py b/decoders/aud/pd.py
new file mode 100644
index 0000000..6be1f83
--- /dev/null
+++ b/decoders/aud/pd.py
@@ -0,0 +1,114 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2016 fenugrec <fenugrec users.sourceforge.net>
+##
+## 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
+##
+
+# TODO:
+#  - Annotations are very crude and could be improved.
+#  - Annotate every nibble? Would give insight on interrupted shifts.
+#  - Annotate invalid "command" nibbles while SYNC==1?
+
+import sigrokdecode as srd
+
+class Decoder(srd.Decoder):
+    api_version = 2
+    id = 'aud'
+    name = 'AUD'
+    longname = 'Advanced User Debugger'
+    desc = 'Renesas/Hitachi Advanced User Debugger (AUD) protocol.'
+    license = 'gplv2+'
+    inputs = ['logic']
+    outputs = ['aud']
+    channels = (
+        {'id': 'audck', 'name': 'AUDCK', 'desc': 'AUD clock'},
+        {'id': 'naudsync', 'name': 'nAUDSYNC', 'desc': 'AUD sync'},
+        {'id': 'audata3', 'name': 'AUDATA3', 'desc': 'AUD data line 3'},
+        {'id': 'audata2', 'name': 'AUDATA2', 'desc': 'AUD data line 2'},
+        {'id': 'audata1', 'name': 'AUDATA1', 'desc': 'AUD data line 1'},
+        {'id': 'audata0', 'name': 'AUDATA0', 'desc': 'AUD data line 0'},
+    )
+    annotations = (
+        ('dest', 'Destination address'),
+    )
+
+    def __init__(self, **kwargs):
+        self.ncnt = 0
+        self.nmax = 0
+        self.addr = 0
+        self.lastaddr = 0
+        self.samplenum = 0
+        self.oldclk = 0
+        self.ss = 0
+
+    def start(self):
+        self.out_ann = self.register(srd.OUTPUT_ANN)
+
+    def putx(self, data):
+        self.put(self.ss, self.samplenum, self.out_ann, data)
+
+    def find_clk_edge(self, clk, sync, datapins):
+        # Ignore sample if there's no edge.
+        if clk == self.oldclk:
+            return
+        self.oldclk = clk
+        # Ignore falling edges.
+        if clk == 0:
+            return
+
+        # Reconstruct nibble.
+        nib = 0
+        for i in range(4):
+            nib |= datapins[3-i] << i
+
+        # sync == 1: annotate if finished; update cmd.
+        # TODO: Annotate idle level (nibble = 0x03 && SYNC=1).
+        if sync == 1:
+            if (self.ncnt == self.nmax) and (self.nmax != 0):
+                # Done shifting an address: annotate.
+                self.putx([0, ['0x%08X' % self.addr]])
+                self.lastaddr = self.addr
+
+            self.ncnt = 0
+            self.addr = self.lastaddr
+            self.ss = self.samplenum
+            if nib == 0x08:
+                self.nmax = 1
+            elif nib == 0x09:
+                self.nmax = 2
+            elif nib == 0x0a:
+                self.nmax = 4
+            elif nib == 0x0b:
+                self.nmax = 8
+            else:
+                # Undefined or idle.
+                self.nmax = 0
+        else:
+            # sync == 0, valid cmd: start or continue shifting in nibbles.
+            if (self.nmax > 0):
+                # Clear tgt nibble.
+                self.addr &= ~(0x0F << (self.ncnt * 4))
+                # Set nibble.
+                self.addr |= nib << (self.ncnt * 4)
+                self.ncnt += 1
+
+    def decode(self, ss, es, data):
+        for (self.samplenum, pins) in data:
+            clk = pins[0]
+            sync = pins[1]
+            d = pins[2:]
+            self.find_clk_edge(clk, sync, d)