--- /dev/null
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2016 Rudolf Reuter <reuterru@arcor.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
+##
+
+import sigrokdecode as srd
+
+class Decoder(srd.Decoder):
+ api_version = 2
+ id = 'gpib'
+ name = 'GPIB'
+ longname = 'General Purpose Interface Bus'
+ desc = 'IEEE-488 GPIB / HPIB protocol.'
+ license = 'gplv2+'
+ inputs = ['logic']
+ outputs = ['gpib']
+ channels = (
+ {'id': 'dio1' , 'name': 'DIO1', 'desc': 'Data I/O bit 1'},
+ {'id': 'dio2' , 'name': 'DIO2', 'desc': 'Data I/O bit 2'},
+ {'id': 'dio3' , 'name': 'DIO3', 'desc': 'Data I/O bit 3'},
+ {'id': 'dio4' , 'name': 'DIO4', 'desc': 'Data I/O bit 4'},
+ {'id': 'dio5' , 'name': 'DIO5', 'desc': 'Data I/O bit 5'},
+ {'id': 'dio6' , 'name': 'DIO6', 'desc': 'Data I/O bit 6'},
+ {'id': 'dio7' , 'name': 'DIO7', 'desc': 'Data I/O bit 7'},
+ {'id': 'dio8' , 'name': 'DIO8', 'desc': 'Data I/O bit 8'},
+ {'id': 'eoi', 'name': 'EOI', 'desc': 'End or identify'},
+ {'id': 'dav', 'name': 'DAV', 'desc': 'Data valid'},
+ {'id': 'nrfd', 'name': 'NRFD', 'desc': 'Not ready for data'},
+ {'id': 'ndac', 'name': 'NDAC', 'desc': 'Not data accepted'},
+ {'id': 'ifc', 'name': 'IFC', 'desc': 'Interface clear'},
+ {'id': 'srq', 'name': 'SRQ', 'desc': 'Service request'},
+ {'id': 'atn', 'name': 'ATN', 'desc': 'Attention'},
+ {'id': 'ren', 'name': 'REN', 'desc': 'Remote enable'},
+ )
+ options = (
+ {'id': 'sample_total', 'desc': 'Total number of samples', 'default': 0},
+ )
+ annotations = (
+ ('items', 'Items'),
+ ('gpib', 'DAT/CMD'),
+ ('eoi', 'EOI'),
+ )
+ annotation_rows = (
+ ('bytes', 'Bytes', (0,)),
+ ('gpib', 'DAT/CMD', (1,)),
+ ('eoi', 'EOI', (2,)),
+ )
+
+ def __init__(self):
+ self.olddav = None
+ self.items = []
+ self.itemcount = 0
+ self.saved_item = None
+ self.saved_ATN = False
+ self.saved_EOI = False
+ self.samplenum = 0
+ self.oldpins = None
+ self.ss_item = self.es_item = None
+ self.first = True
+
+ def start(self):
+ self.out_ann = self.register(srd.OUTPUT_ANN)
+
+ def putb(self, data):
+ self.put(self.ss_item, self.es_item, self.out_ann, data)
+
+ def handle_bits(self, datapins):
+ dbyte = 0x20
+ dATN = False
+ item2 = False
+ dEOI = False
+ item3 = False
+ # If this is the first item in a word, save its sample number.
+ if self.itemcount == 0:
+ self.ss_word = self.samplenum
+
+ # Get the bits for this item.
+ item = 0
+ for i in range(8):
+ item |= datapins[i] << i
+
+ item = item ^ 0xff # Invert data byte.
+ self.items.append(item)
+ self.itemcount += 1
+
+ if datapins[14] == 0:
+ item2 = True
+ if datapins[8] == 0:
+ item3 = True
+
+ if self.first:
+ # Save the start sample and item for later (no output yet).
+ self.ss_item = self.samplenum
+ self.first = False
+ self.saved_item = item
+ self.saved_ATN = item2
+ self.saved_EOI = item3
+ else:
+ # Output the saved item.
+ dbyte = self.saved_item
+ dATN = self.saved_ATN
+ dEOI = self.saved_EOI
+ self.es_item = self.samplenum
+ self.putb([0, ['%02X' % self.saved_item]])
+
+ # Encode item byte to GPIB convention.
+ self.strgpib = ' '
+ if dATN: # ATN, decode commands.
+ if dbyte == 0x01: self.strgpib = 'GTL'
+ if dbyte == 0x04: self.strgpib = 'SDC'
+ if dbyte == 0x05: self.strgpib = 'PPC'
+ if dbyte == 0x08: self.strgpib = 'GET'
+ if dbyte == 0x09: self.strgpib = 'TCT'
+ if dbyte == 0x11: self.strgpib = 'LLO'
+ if dbyte == 0x14: self.strgpib = 'DCL'
+ if dbyte == 0x15: self.strgpib = 'PPU'
+ if dbyte == 0x18: self.strgpib = 'SPE'
+ if dbyte == 0x19: self.strgpib = 'SPD'
+ if dbyte == 0x3f: self.strgpib = 'UNL'
+ if dbyte == 0x5f: self.strgpib = 'UNT'
+ if dbyte > 0x1f and dbyte < 0x3f: # Address Listener.
+ self.strgpib = 'L' + chr(dbyte + 0x10)
+ if dbyte > 0x3f and dbyte < 0x5f: # Address Talker
+ self.strgpib = 'T' + chr(dbyte - 0x10)
+ else:
+ if dbyte > 0x1f and dbyte < 0x7f:
+ self.strgpib = chr(dbyte)
+ if dbyte == 0x0a:
+ self.strgpib = 'LF'
+ if dbyte == 0x0d:
+ self.strgpib = 'CR'
+
+ self.putb([1, [self.strgpib]])
+ self.strEOI = ' '
+ if dEOI:
+ self.strEOI = 'EOI'
+ self.putb([2, [self.strEOI]])
+
+ self.ss_item = self.samplenum
+ self.saved_item = item
+ self.saved_ATN = item2
+ self.saved_EOI = item3
+
+ if self.itemcount < 16:
+ return
+
+ self.itemcount, self.items = 0, []
+
+ def find_falling_dav_edge(self, dav, datapins):
+ # Ignore sample if the DAV pin hasn't changed.
+ if dav == self.olddav:
+ return
+ self.olddav = dav
+ # Sample on falling DAV edge.
+ if dav == 1:
+ return
+
+ # Found the correct DAV edge, now get the bits.
+ self.handle_bits(datapins)
+
+ def decode(self, ss, es, data):
+ lsn = self.options['sample_total']
+
+ for (self.samplenum, pins) in data:
+ if lsn > 0:
+ if (lsn - self.samplenum) == 1: # Show the last data word.
+ self.handle_bits(pins)
+
+ # Ignore identical samples early on (for performance reasons).
+ if self.oldpins == pins:
+ continue
+ self.oldpins = pins
+
+ self.find_falling_dav_edge(pins[9], pins)
projects / libsigrokdecode.git / commitdiff