From: Rudolf Reuter Date: Wed, 12 Oct 2016 00:51:28 +0000 (+0200) Subject: Add an initial GPIB decoder. X-Git-Tag: libsigrokdecode-0.5.0~138 X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=ffd58b683fc200c3bfb96a274dd2bc5c4cea7dcc;p=libsigrokdecode.git Add an initial GPIB decoder. --- diff --git a/decoders/gpib/__init__.py b/decoders/gpib/__init__.py new file mode 100644 index 0000000..3dae563 --- /dev/null +++ b/decoders/gpib/__init__.py @@ -0,0 +1,25 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2016 Rudolf Reuter +## +## 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 can decode the GPIB (IEEE-488) protocol. +''' + +from .pd import Decoder diff --git a/decoders/gpib/pd.py b/decoders/gpib/pd.py new file mode 100644 index 0000000..0712966 --- /dev/null +++ b/decoders/gpib/pd.py @@ -0,0 +1,189 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2016 Rudolf Reuter +## +## 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)