+++ /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, see <http://www.gnu.org/licenses/>.
-##
-
-import sigrokdecode as srd
-
-class Decoder(srd.Decoder):
- api_version = 3
- id = 'gpib'
- name = 'GPIB'
- longname = 'General Purpose Interface Bus'
- desc = 'IEEE-488 General Purpose Interface Bus (GPIB / HPIB).'
- license = 'gplv2+'
- inputs = ['logic']
- outputs = []
- tags = ['PC']
- 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'},
- )
- annotations = (
- ('items', 'Items'),
- ('gpib', 'DAT/CMD'),
- ('eoi', 'EOI'),
- )
- annotation_rows = (
- ('bytes', 'Bytes', (0,)),
- ('gpib', 'DAT/CMD', (1,)),
- ('eoi', 'EOI', (2,)),
- )
-
- def __init__(self):
- self.reset()
-
- def reset(self):
- self.items = []
- self.itemcount = 0
- self.saved_item = None
- self.saved_ATN = False
- self.saved_EOI = False
- self.samplenum = 0
- 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 decode(self):
-
- # Inspect samples at falling edge of DAV. But make sure to also
- # start inspection when the capture happens to start with low
- # DAV level.
- waitcond = [{9: 'l'}]
- while True:
- pins = self.wait(waitcond)
- self.handle_bits(pins)
- waitcond[0][9] = 'f'
projects / libsigrokdecode.git / blobdiff