srd: Each PD now has its own subdirectory.

3 files changed, 241 insertions, 0 deletions

diff --git a/decoders/usb/Makefile.am b/decoders/usb/Makefile.am
new file mode 100644
index 0000000..f758e06
--- /dev/null
+++ b/decoders/usb/Makefile.am
@@ -0,0 +1,26 @@
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 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
+##
+
+pkgdatadir = $(DECODERS_DIR)/usb
+
+dist_pkgdata_DATA = __init__.py usb.py
+
+CLEANFILES = *.pyc
+
diff --git a/decoders/usb/__init__.py b/decoders/usb/__init__.py
new file mode 100644
index 0000000..068cadf
--- /dev/null
+++ b/decoders/usb/__init__.py
@@ -0,0 +1,22 @@
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 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
+##
+
+from .usb import *
+
diff --git a/decoders/usb/usb.py b/decoders/usb/usb.py
new file mode 100644
index 0000000..073fe01
--- /dev/null
+++ b/decoders/usb/usb.py
@@ -0,0 +1,193 @@
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
+##
+## 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
+##
+
+#
+# USB Full-speed protocol decoder
+#
+# Full-speed USB signalling consists of two signal lines, both driven at 3.3V
+# logic levels. The signals are DP (D+) and DM (D-), and normally operate in
+# differential mode.
+# The state where DP=1,DM=0 is J, the state DP=0,DM=1 is K.
+# A state SE0 is defined where DP=DM=0. This common mode signal is used to
+# signal a reset or end of packet.
+#
+# Data transmitted on the USB is encoded with NRZI. A transition from J to K
+# or vice-versa indicates a logic 0, while no transition indicates a logic 1.
+# If 6 ones are transmitted consecutively, a zero is inserted to force a
+# transition. This is known as bit stuffing. Data is transferred at a rate
+# of 12Mbit/s. The SE0 transmitted to signal an end-of-packet is two bit
+# intervals long.
+#
+# Details:
+# https://en.wikipedia.org/wiki/USB
+# http://www.usb.org/developers/docs/
+#
+
+import sigrokdecode as srd
+
+# States
+SE0, J, K, SE1 = 0, 1, 2, 3
+
+# ...
+syms = {
+        (0, 0): SE0,
+        (1, 0): J,
+        (0, 1): K,
+        (1, 1): SE1,
+}
+
+# ...
+pids = {
+    '10000111': 'OUT',      # Tokens
+    '10010110': 'IN',
+    '10100101': 'SOF',
+    '10110100': 'SETUP',
+    '11000011': 'DATA0',    # Data
+    '11010010': 'DATA1',
+    '01001011': 'ACK',      # Handshake
+    '01011010': 'NAK',
+    '01111000': 'STALL',
+    '01101001': 'NYET',
+}
+
+def bitstr_to_num(bitstr):
+    if not bitstr:
+        return 0
+    l = list(bitstr)
+    l.reverse()
+    return int(''.join(l), 2)
+
+def packet_decode(packet):
+    sync = packet[:8]
+    pid = packet[8:16]
+    pid = pids.get(pid, pid)
+
+    # Remove CRC.
+    if pid in ('OUT', 'IN', 'SOF', 'SETUP'):
+        data = packet[16:-5]
+        if pid == 'SOF':
+            data = str(bitstr_to_num(data))
+        else:
+            dev = bitstr_to_num(data[:7])
+            ep = bitstr_to_num(data[7:])
+            data = 'DEV %d EP %d' % (dev, ep)
+
+    elif pid in ('DATA0', 'DATA1'):
+        data = packet[16:-16]
+        tmp = ''
+        while data:
+            tmp += '%02x ' % bitstr_to_num(data[:8])
+            data = data[8:]
+        data = tmp
+    else:
+        data = packet[16:]
+
+    if sync != '00000001':
+        return 'SYNC INVALID!'
+
+    return pid + ' ' + data
+
+class Decoder(srd.Decoder):
+    id = 'usb'
+    name = 'USB'
+    longname = 'Universal Serial Bus'
+    desc = 'Universal Serial Bus'
+    longdesc = '...longdesc...'
+    license = 'gplv2+'
+    inputs = ['logic']
+    outputs = ['usb']
+    probes = [
+        {'id': 'dp', 'name': 'D+', 'desc': 'USB D+ signal'},
+        {'id': 'dm', 'name': 'D-', 'desc': 'USB D- signal'},
+    ]
+    options = {}
+    annotations = [
+        ['TODO', 'TODO']
+    ]
+
+    def __init__(self):
+        pass
+
+    def start(self, metadata):
+        self.rate = metadata['samplerate']
+
+        # self.out_proto = self.add(srd.OUTPUT_PROTO, 'usb')
+        self.out_ann = self.add(srd.OUTPUT_ANN, 'usb')
+
+        if self.rate < 48000000:
+            raise Exception('Sample rate not sufficient for USB decoding')
+
+        # Initialise decoder state.
+        self.sym = J
+        self.scount = 0
+        self.packet = ''
+
+    def decode(self, ss, es, data):
+
+        # FIXME
+        # for (samplenum, (dp, dm, x, y, z, a)) in data:
+        for (samplenum, (dm, dp)) in data:
+
+            self.scount += 1
+
+            sym = syms[dp, dm]
+
+            # ...
+            if sym == self.sym:
+                continue
+
+            if self.scount == 1:
+                # We ignore single sample width pulses.
+                # I sometimes get these with the OLS.
+                self.sym = sym
+                self.scount = 0
+                continue
+
+            # How many bits since the last transition?
+            if self.packet != '' or self.sym != J:
+                bitcount = int((self.scount - 1) * 12000000 / self.rate)
+            else:
+                bitcount = 0
+
+            if self.sym == SE0:
+                if bitcount == 1:
+                    # End-Of-Packet (EOP)
+                    self.put(0, 0, self.out_ann,
+                             [0, [packet_decode(self.packet), self.packet]])
+                else:
+                    # Longer than EOP, assume reset.
+                    self.put(0, 0, self.out_ann, [0, ['RESET']])
+                self.scount = 0
+                self.sym = sym
+                self.packet = ''
+                continue
+
+            # Add bits to the packet string.
+            self.packet += '1' * bitcount
+
+            # Handle bit stuffing.
+            if bitcount < 6 and sym != SE0:
+                self.packet += '0'
+            elif bitcount > 6:
+                self.put(0, 0, self.out_ann, [0, ['BIT STUFF ERROR']])
+
+            self.scount = 0
+            self.sym = sym
+