2 ## This file is part of the libsigrokdecode project.
4 ## Copyright (C) 2016 Rudolf Reuter <reuterru@arcor.de>
5 ## Copyright (C) 2017 Marcus Comstedt <marcus@mc.pp.se>
6 ## Copyright (C) 2019 Gerhard Sittig <gerhard.sittig@gmx.net>
8 ## This program is free software; you can redistribute it and/or modify
9 ## it under the terms of the GNU General Public License as published by
10 ## the Free Software Foundation; either version 2 of the License, or
11 ## (at your option) any later version.
13 ## This program is distributed in the hope that it will be useful,
14 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ## GNU General Public License for more details.
18 ## You should have received a copy of the GNU General Public License
19 ## along with this program; if not, see <http://www.gnu.org/licenses/>.
22 # This file was created from earlier implementations of the 'gpib' and
23 # the 'iec' protocol decoders. It combines the parallel and the serial
24 # transmission variants in a single instance with optional inputs for
25 # maximum code re-use.
28 # - Extend annotations for improved usability.
29 # - Keep talkers' data streams on separate annotation rows? Is this useful
30 # here at the GPIB level, or shall stacked decoders dispatch these? May
31 # depend on how often captures get inspected which involve multiple peers.
32 # - Make serial bit annotations optional? Could slow down interactive
33 # exploration for long captures (see USB).
34 # - Move the inlined Commodore IEC peripherals support to a stacked decoder
35 # when more peripherals get added.
36 # - SCPI over GPIB may "represent somewhat naturally" here already when
37 # text lines are a single run of data at the GPIB layer (each line between
38 # the address spec and either EOI or ATN). So a stacked SCPI decoder may
39 # only become necessary when the text lines' content shall get inspected.
41 import sigrokdecode as srd
42 from common.srdhelper import bitpack
45 OUTPUT_PYTHON format for stacked decoders:
47 General packet format:
48 [<ptype>, <addr>, <pdata>]
50 This is the list of <ptype>s and their respective <pdata> values:
52 Raw bits and bytes at the physical transport level:
53 - 'IEC_BIT': <addr> is not applicable, <pdata> is the transport's bit value.
54 - 'GPIB_RAW': <addr> is not applicable, <pdata> is the transport's
55 byte value. Data bytes are in the 0x00-0xff range, command/address
56 bytes are in the 0x100-0x1ff range.
58 GPIB level byte fields (commands, addresses, pieces of data):
59 - 'COMMAND': <addr> is not applicable, <pdata> is the command's byte value.
60 - 'LISTEN': <addr> is the listener address (0-30), <pdata> is the raw
61 byte value (including the 0x20 offset).
62 - 'TALK': <addr> is the talker address (0-30), <pdata> is the raw byte
63 value (including the 0x40 offset).
64 - 'SECONDARY': <addr> is the secondary address (0-31), <pdata> is the
65 raw byte value (including the 0x60 offset).
66 - 'MSB_SET': <addr> as well as <pdata> are the raw byte value (including
67 the 0x80 offset). This usually does not happen for GPIB bytes with ATN
68 active, but was observed with the IEC bus and Commodore floppy drives,
69 when addressing channels within the device.
70 - 'DATA_BYTE': <addr> is the talker address (when available), <pdata>
71 is the raw data byte (transport layer, ATN inactive).
73 Extracted payload information (peers and their communicated data):
74 - 'TALK_LISTEN': <addr> is the current talker, <pdata> is the list of
75 current listeners. These updates for the current "connected peers"
76 are sent when the set of peers changes, i.e. after talkers/listeners
77 got selected or deselected. Of course the data only covers what could
78 be gathered from the input data. Some controllers may not explicitly
79 address themselves, or captures may not include an early setup phase.
80 - 'TALKER_BYTES': <addr> is the talker address (when available), <pdata>
81 is the accumulated byte sequence between addressing a talker and EOI,
82 or the next command/address.
83 - 'TALKER_TEXT': <addr> is the talker address (when available), <pdata>
84 is the accumulated text sequence between addressing a talker and EOI,
85 or the next command/address.
88 class ChannelError(Exception):
91 def _format_ann_texts(fmts, **args):
94 return [fmt.format(**args) for fmt in fmts]
97 # Command codes in the 0x00-0x1f range.
98 0x01: ['Go To Local', 'GTL'],
99 0x04: ['Selected Device Clear', 'SDC'],
100 0x05: ['Parallel Poll Configure', 'PPC'],
101 0x08: ['Global Execute Trigger', 'GET'],
102 0x09: ['Take Control', 'TCT'],
103 0x11: ['Local Lock Out', 'LLO'],
104 0x14: ['Device Clear', 'DCL'],
105 0x15: ['Parallel Poll Unconfigure', 'PPU'],
106 0x18: ['Serial Poll Enable', 'SPE'],
107 0x19: ['Serial Poll Disable', 'SPD'],
108 # Unknown type of command.
109 None: ['Unknown command 0x{cmd:02x}', 'command 0x{cmd:02x}', 'cmd {cmd:02x}', 'C{cmd_ord:c}'],
110 # Special listener/talker "addresses" (deselecting previous peers).
111 0x3f: ['Unlisten', 'UNL'],
112 0x5f: ['Untalk', 'UNT'],
116 # Returns a tuple of booleans (or None when not applicable) whether
117 # the raw GPIB byte is: a command, an un-listen, an un-talk command.
118 if b in range(0x00, 0x20):
119 return True, None, None
120 if b in range(0x20, 0x40) and (b & 0x1f) == 31:
121 return True, True, False
122 if b in range(0x40, 0x60) and (b & 0x1f) == 31:
123 return True, False, True
124 return False, None, None
126 def _is_listen_addr(b):
127 if b in range(0x20, 0x40):
131 def _is_talk_addr(b):
132 if b in range(0x40, 0x60):
136 def _is_secondary_addr(b):
137 if b in range(0x60, 0x80):
146 def _get_raw_byte(b, atn):
147 # "Decorate" raw byte values for stacked decoders.
153 def _get_raw_text(b, atn):
154 return ['{leader}{data:02x}'.format(leader = '/' if atn else '', data = b)]
156 def _get_command_texts(b):
157 fmts = _cmd_table.get(b, None)
158 known = fmts is not None
160 fmts = _cmd_table.get(None, None)
163 return known, _format_ann_texts(fmts, cmd = b, cmd_ord = ord('0') + b)
165 def _get_address_texts(b):
166 laddr = _is_listen_addr(b)
167 taddr = _is_talk_addr(b)
168 saddr = _is_secondary_addr(b)
171 if laddr is not None:
172 fmts = ['Listen {addr:d}', 'L {addr:d}', 'L{addr_ord:c}']
174 elif taddr is not None:
175 fmts = ['Talk {addr:d}', 'T {addr:d}', 'T{addr_ord:c}']
177 elif saddr is not None:
178 fmts = ['Secondary {addr:d}', 'S {addr:d}', 'S{addr_ord:c}']
180 elif msb is not None: # For IEC bus compat.
181 fmts = ['Secondary {addr:d}', 'S {addr:d}', 'S{addr_ord:c}']
183 return _format_ann_texts(fmts, addr = addr, addr_ord = ord('0') + addr)
185 def _get_data_text(b):
186 # TODO Move the table of ASCII control characters to a common location?
187 # TODO Move the "printable with escapes" logic to a common helper?
222 # Yes, exclude 0x7f (DEL) here. It's considered non-printable.
223 if b in range(0x20, 0x7f) and b not in ('[', ']'):
224 return '{:s}'.format(chr(b))
225 elif b in _control_codes:
226 return '[{:s}]'.format(_control_codes[b])
227 # Use a compact yet readable and unambigous presentation for bytes
228 # which contain non-printables. The format that is used here is
229 # compatible with 93xx EEPROM and UART decoders.
230 return '[{:02x}]'.format(b)
233 PIN_DIO1, PIN_DIO2, PIN_DIO3, PIN_DIO4,
234 PIN_DIO5, PIN_DIO6, PIN_DIO7, PIN_DIO8,
235 PIN_EOI, PIN_DAV, PIN_NRFD, PIN_NDAC,
236 PIN_IFC, PIN_SRQ, PIN_ATN, PIN_REN,
242 ANN_RAW_BIT, ANN_RAW_BYTE,
243 ANN_CMD, ANN_LADDR, ANN_TADDR, ANN_SADDR, ANN_DATA,
246 # TODO Want to provide one annotation class per talker address (0-30)?
254 # TODO Want to provide one binary annotation class per talker address (0-30)?
257 class Decoder(srd.Decoder):
261 longname = 'General Purpose Interface Bus'
262 desc = 'IEEE-488 General Purpose Interface Bus (GPIB/HPIB or IEC).'
265 outputs = ['ieee488']
266 tags = ['PC', 'Retro computing']
268 {'id': 'dio1' , 'name': 'DIO1/DATA',
269 'desc': 'Data I/O bit 1, or serial data'},
271 optional_channels = (
272 {'id': 'dio2' , 'name': 'DIO2', 'desc': 'Data I/O bit 2'},
273 {'id': 'dio3' , 'name': 'DIO3', 'desc': 'Data I/O bit 3'},
274 {'id': 'dio4' , 'name': 'DIO4', 'desc': 'Data I/O bit 4'},
275 {'id': 'dio5' , 'name': 'DIO5', 'desc': 'Data I/O bit 5'},
276 {'id': 'dio6' , 'name': 'DIO6', 'desc': 'Data I/O bit 6'},
277 {'id': 'dio7' , 'name': 'DIO7', 'desc': 'Data I/O bit 7'},
278 {'id': 'dio8' , 'name': 'DIO8', 'desc': 'Data I/O bit 8'},
279 {'id': 'eoi', 'name': 'EOI', 'desc': 'End or identify'},
280 {'id': 'dav', 'name': 'DAV', 'desc': 'Data valid'},
281 {'id': 'nrfd', 'name': 'NRFD', 'desc': 'Not ready for data'},
282 {'id': 'ndac', 'name': 'NDAC', 'desc': 'Not data accepted'},
283 {'id': 'ifc', 'name': 'IFC', 'desc': 'Interface clear'},
284 {'id': 'srq', 'name': 'SRQ', 'desc': 'Service request'},
285 {'id': 'atn', 'name': 'ATN', 'desc': 'Attention'},
286 {'id': 'ren', 'name': 'REN', 'desc': 'Remote enable'},
287 {'id': 'clk', 'name': 'CLK', 'desc': 'Serial clock'},
290 {'id': 'iec_periph', 'desc': 'Decode Commodore IEC bus peripherals details',
291 'default': 'no', 'values': ('no', 'yes')},
297 ('laddr', 'Listener address'),
298 ('taddr', 'Talker address'),
299 ('saddr', 'Secondary address'),
300 ('data', 'Data byte'),
302 ('text', 'Talker text'),
303 ('periph', 'IEC bus peripherals'),
307 ('bits', 'IEC bits', (ANN_RAW_BIT,)),
308 ('raws', 'Raw bytes', (ANN_RAW_BYTE,)),
309 ('gpib', 'Commands/data', (ANN_CMD, ANN_LADDR, ANN_TADDR, ANN_SADDR, ANN_DATA,)),
310 ('eois', 'EOI', (ANN_EOI,)),
311 ('texts', 'Talker texts', (ANN_TEXT,)),
312 ('periphs', 'IEC peripherals', (ANN_IEC_PERIPH,)),
313 ('warns', 'Warnings', (ANN_WARN,)),
316 ('raw', 'Raw bytes'),
317 ('data', 'Talker bytes'),
327 self.latch_atn = None
328 self.latch_eoi = None
337 self.last_talker = None
338 self.last_listener = []
339 self.last_iec_addr = None
340 self.last_iec_sec = None
343 self.out_ann = self.register(srd.OUTPUT_ANN)
344 self.out_bin = self.register(srd.OUTPUT_BINARY)
345 self.out_python = self.register(srd.OUTPUT_PYTHON)
347 def putg(self, ss, es, data):
348 self.put(ss, es, self.out_ann, data)
350 def putbin(self, ss, es, data):
351 self.put(ss, es, self.out_bin, data)
353 def putpy(self, ss, es, ptype, addr, pdata):
354 self.put(ss, es, self.out_python, [ptype, addr, pdata])
356 def emit_eoi_ann(self, ss, es):
357 self.putg(ss, es, [ANN_EOI, ['EOI']])
359 def emit_bin_ann(self, ss, es, ann_cls, data):
360 self.putbin(ss, es, [ann_cls, bytes(data)])
362 def emit_data_ann(self, ss, es, ann_cls, data):
363 self.putg(ss, es, [ann_cls, data])
365 def emit_warn_ann(self, ss, es, data):
366 self.putg(ss, es, [ANN_WARN, data])
368 def flush_bytes_text_accu(self):
369 if self.accu_bytes and self.ss_text is not None and self.es_text is not None:
370 self.emit_bin_ann(self.ss_text, self.es_text, BIN_DATA, bytearray(self.accu_bytes))
371 self.putpy(self.ss_text, self.es_text, 'TALKER_BYTES', self.last_talker, bytearray(self.accu_bytes))
373 if self.accu_text and self.ss_text is not None and self.es_text is not None:
374 text = ''.join(self.accu_text)
375 self.emit_data_ann(self.ss_text, self.es_text, ANN_TEXT, [text])
376 self.putpy(self.ss_text, self.es_text, 'TALKER_TEXT', self.last_talker, text)
378 self.ss_text = self.es_text = None
380 def handle_ifc_change(self, ifc):
381 # Track IFC line for parallel input.
382 # Assertion of IFC de-selects all talkers and listeners.
384 self.last_talker = None
385 self.last_listener = []
387 def handle_eoi_change(self, eoi):
388 # Track EOI line for parallel and serial input.
390 self.ss_eoi = self.samplenum
393 self.es_eoi = self.samplenum
394 if self.ss_eoi and self.latch_eoi:
395 self.emit_eoi_ann(self.ss_eoi, self.es_eoi)
396 self.es_text = self.es_eoi
397 self.flush_bytes_text_accu()
398 self.ss_eoi = self.es_eoi = None
401 def handle_atn_change(self, atn):
402 # Track ATN line for parallel and serial input.
405 self.flush_bytes_text_accu()
407 def handle_iec_periph(self, ss, es, addr, sec, data):
408 # The annotation is optional.
409 if self.options['iec_periph'] != 'yes':
411 # Void internal state.
412 if addr is None and sec is None and data is None:
413 self.last_iec_addr = None
414 self.last_iec_sec = None
416 # Grab and evaluate new input.
418 # TODO Add more items here. See the "Device numbering" section
419 # of the https://en.wikipedia.org/wiki/Commodore_bus page.
423 _iec_disk_range = range(8, 16)
425 self.last_iec_addr = addr
426 name = _iec_addr_names.get(addr, None)
428 self.emit_data_ann(ss, es, ANN_IEC_PERIPH, [name])
429 addr = self.last_iec_addr # Simplify subsequent logic.
431 # BEWARE! The secondary address is a full byte and includes
432 # the 0x60 offset, to also work when the MSB was set.
433 self.last_iec_sec = sec
434 subcmd, channel = sec & 0xf0, sec & 0x0f
435 channel_ord = ord('0') + channel
436 if addr is not None and addr in _iec_disk_range:
438 0x60: ['Reopen {ch:d}', 'Re {ch:d}', 'R{ch_ord:c}'],
439 0xe0: ['Close {ch:d}', 'Cl {ch:d}', 'C{ch_ord:c}'],
440 0xf0: ['Open {ch:d}', 'Op {ch:d}', 'O{ch_ord:c}'],
443 texts = _format_ann_texts(subcmd_fmts, ch = channel, ch_ord = channel_ord)
444 self.emit_data_ann(ss, es, ANN_IEC_PERIPH, texts)
445 sec = self.last_iec_sec # Simplify subsequent logic.
447 if addr is None or sec is None:
449 # TODO Process data depending on peripheral type and channel?
451 def handle_data_byte(self):
453 texts = _get_raw_text(b, self.curr_atn)
454 self.emit_data_ann(self.ss_raw, self.es_raw, ANN_RAW_BYTE, texts)
455 self.emit_bin_ann(self.ss_raw, self.es_raw, BIN_RAW, b.to_bytes(1, byteorder='big'))
456 self.putpy(self.ss_raw, self.es_raw, 'GPIB_RAW', None, _get_raw_byte(b, self.curr_atn))
462 is_cmd, is_unl, is_unt = _is_command(b)
463 laddr = _is_listen_addr(b)
464 taddr = _is_talk_addr(b)
465 saddr = _is_secondary_addr(b)
468 known, texts = _get_command_texts(b)
470 warn_texts = ['Unknown GPIB command', 'unknown', 'UNK']
471 self.emit_warn_ann(self.ss_raw, self.es_raw, warn_texts)
473 py_type, py_addr = 'COMMAND', None
475 self.last_listener = []
478 self.last_talker = None
481 upd_iec = True, None, None, None
482 elif laddr is not None:
484 texts = _get_address_texts(b)
486 py_type, py_addr = 'LISTEN', addr
487 if addr == self.last_talker:
488 self.last_talker = None
489 self.last_listener.append(addr)
490 upd_iec = True, addr, None, None
492 elif taddr is not None:
494 texts = _get_address_texts(b)
496 py_type, py_addr = 'TALK', addr
497 if addr in self.last_listener:
498 self.last_listener.remove(addr)
499 self.last_talker = addr
500 upd_iec = True, addr, None, None
502 elif saddr is not None:
504 texts = _get_address_texts(b)
506 upd_iec = True, None, b, None
507 py_type, py_addr = 'SECONDARY', addr
508 elif msb is not None:
509 # These are not really "secondary addresses", but they
510 # are used by the Commodore IEC bus (floppy channels).
511 texts = _get_address_texts(b)
513 upd_iec = True, None, b, None
514 py_type, py_addr = 'MSB_SET', b
515 if ann_cls is not None and texts is not None:
516 self.emit_data_ann(self.ss_raw, self.es_raw, ann_cls, texts)
518 self.handle_iec_periph(self.ss_raw, self.es_raw, upd_iec[1], upd_iec[2], upd_iec[3])
520 self.putpy(self.ss_raw, self.es_raw, py_type, py_addr, b)
522 self.last_listener.sort()
523 self.putpy(self.ss_raw, self.es_raw, 'TALK_LISTEN', self.last_talker, self.last_listener)
525 self.accu_bytes.append(b)
526 text = _get_data_text(b)
527 if not self.accu_text:
528 self.ss_text = self.ss_raw
529 self.accu_text.append(text)
530 self.es_text = self.es_raw
531 self.emit_data_ann(self.ss_raw, self.es_raw, ANN_DATA, [text])
532 self.handle_iec_periph(self.ss_raw, self.es_raw, None, None, b)
533 self.putpy(self.ss_raw, self.es_raw, 'DATA_BYTE', self.last_talker, b)
535 def handle_dav_change(self, dav, data):
537 # Data availability starts when the flag goes active.
538 self.ss_raw = self.samplenum
539 self.curr_raw = bitpack(data)
540 self.latch_atn = self.curr_atn
541 self.latch_eoi = self.curr_eoi
543 # Data availability ends when the flag goes inactive. Handle the
544 # previously captured data byte according to associated flags.
545 self.es_raw = self.samplenum
546 self.handle_data_byte()
547 self.ss_raw = self.es_raw = None
550 def inject_dav_phase(self, ss, es, data):
551 # Inspection of serial input has resulted in one raw byte which
552 # spans a given period of time. Pretend we had seen a DAV active
553 # phase, to re-use code for the parallel transmission.
555 self.curr_raw = bitpack(data)
556 self.latch_atn = self.curr_atn
557 self.latch_eoi = self.curr_eoi
559 self.handle_data_byte()
560 self.ss_raw = self.es_raw = None
563 def invert_pins(self, pins):
564 # All lines (including data bits!) are low active and thus need
565 # to get inverted to receive their logical state (high active,
566 # regular data bit values). Cope with inputs being optional.
567 return [1 - p if p in (0, 1) else p for p in pins]
569 def decode_serial(self, has_clk, has_data_1, has_atn, has_srq):
570 if not has_clk or not has_data_1 or not has_atn:
571 raise ChannelError('IEC bus needs at least ATN and serial CLK and DATA.')
573 # This is a rephrased version of decoders/iec/pd.py:decode().
574 # SRQ was not used there either. Magic numbers were eliminated.
576 STEP_WAIT_READY_TO_SEND,
577 STEP_WAIT_READY_FOR_DATA,
578 STEP_PREP_DATA_TEST_EOI,
579 STEP_CLOCK_DATA_BITS,
582 [{PIN_ATN: 'f'}, {PIN_DATA: 'l', PIN_CLK: 'h'}],
583 [{PIN_ATN: 'f'}, {PIN_DATA: 'h', PIN_CLK: 'h'}, {PIN_CLK: 'l'}],
584 [{PIN_ATN: 'f'}, {PIN_DATA: 'f'}, {PIN_CLK: 'l'}],
585 [{PIN_ATN: 'f'}, {PIN_CLK: 'e'}],
587 step = STEP_WAIT_READY_TO_SEND
592 # Sample input pin values. Keep DATA/CLK in verbatim form to
593 # re-use 'iec' decoder logic. Turn ATN to positive logic for
594 # easier processing. The data bits get handled during byte
596 pins = self.wait(step_wait_conds[step])
597 data, clk = pins[PIN_DATA], pins[PIN_CLK]
598 atn, = self.invert_pins([pins[PIN_ATN]])
601 # Falling edge on ATN, reset step.
602 step = STEP_WAIT_READY_TO_SEND
604 if step == STEP_WAIT_READY_TO_SEND:
605 # Don't use self.matched[1] here since we might come from
606 # a step with different conds due to the code above.
607 if data == 0 and clk == 1:
608 # Rising edge on CLK while DATA is low: Ready to send.
609 step = STEP_WAIT_READY_FOR_DATA
610 elif step == STEP_WAIT_READY_FOR_DATA:
611 if data == 1 and clk == 1:
612 # Rising edge on DATA while CLK is high: Ready for data.
613 ss_byte = self.samplenum
614 self.handle_atn_change(atn)
616 self.handle_eoi_change(False)
618 step = STEP_PREP_DATA_TEST_EOI
620 # CLK low again, transfer aborted.
621 step = STEP_WAIT_READY_TO_SEND
622 elif step == STEP_PREP_DATA_TEST_EOI:
623 if data == 0 and clk == 1:
624 # DATA goes low while CLK is still high, EOI confirmed.
625 self.handle_eoi_change(True)
627 step = STEP_CLOCK_DATA_BITS
628 ss_bit = self.samplenum
629 elif step == STEP_CLOCK_DATA_BITS:
632 # Rising edge on CLK; latch DATA.
635 # Falling edge on CLK; end of bit.
636 es_bit = self.samplenum
637 self.emit_data_ann(ss_bit, es_bit, ANN_RAW_BIT, ['{:d}'.format(bits[-1])])
638 self.putpy(ss_bit, es_bit, 'IEC_BIT', None, bits[-1])
639 ss_bit = self.samplenum
641 es_byte = self.samplenum
642 self.inject_dav_phase(ss_byte, es_byte, bits)
644 self.handle_eoi_change(False)
645 step = STEP_WAIT_READY_TO_SEND
647 def decode_parallel(self, has_data_n, has_dav, has_atn, has_eoi, has_srq):
649 if False in has_data_n or not has_dav or not has_atn:
650 raise ChannelError('IEEE-488 needs at least ATN and DAV and eight DIO lines.')
651 has_ifc = self.has_channel(PIN_IFC)
653 # Capture data lines at the falling edge of DAV, process their
654 # values at rising DAV edge (when data validity ends). Also make
655 # sure to start inspection when the capture happens to start with
656 # low signal levels, i.e. won't include the initial falling edge.
657 # Scan for ATN/EOI edges as well (including the trick which works
658 # around initial pin state).
659 # Map low-active physical transport lines to positive logic here,
660 # to simplify logical inspection/decoding of communicated data,
661 # and to avoid redundancy and inconsistency in later code paths.
663 idx_dav = len(waitcond)
664 waitcond.append({PIN_DAV: 'l'})
665 idx_atn = len(waitcond)
666 waitcond.append({PIN_ATN: 'l'})
669 idx_eoi = len(waitcond)
670 waitcond.append({PIN_EOI: 'l'})
673 idx_ifc = len(waitcond)
674 waitcond.append({PIN_IFC: 'l'})
676 pins = self.wait(waitcond)
677 pins = self.invert_pins(pins)
679 # BEWARE! Order of evaluation does matter. For low samplerate
680 # captures, many edges fall onto the same sample number. So
681 # we process active edges of flags early (before processing
682 # data bits), and inactive edges late (after data got processed).
683 if idx_ifc is not None and self.matched[idx_ifc] and pins[PIN_IFC] == 1:
684 self.handle_ifc_change(pins[PIN_IFC])
685 if idx_eoi is not None and self.matched[idx_eoi] and pins[PIN_EOI] == 1:
686 self.handle_eoi_change(pins[PIN_EOI])
687 if self.matched[idx_atn] and pins[PIN_ATN] == 1:
688 self.handle_atn_change(pins[PIN_ATN])
689 if self.matched[idx_dav]:
690 self.handle_dav_change(pins[PIN_DAV], pins[PIN_DIO1:PIN_DIO8 + 1])
691 if self.matched[idx_atn] and pins[PIN_ATN] == 0:
692 self.handle_atn_change(pins[PIN_ATN])
693 if idx_eoi is not None and self.matched[idx_eoi] and pins[PIN_EOI] == 0:
694 self.handle_eoi_change(pins[PIN_EOI])
695 if idx_ifc is not None and self.matched[idx_ifc] and pins[PIN_IFC] == 0:
696 self.handle_ifc_change(pins[PIN_IFC])
698 waitcond[idx_dav][PIN_DAV] = 'e'
699 waitcond[idx_atn][PIN_ATN] = 'e'
701 waitcond[idx_eoi][PIN_EOI] = 'e'
703 waitcond[idx_ifc][PIN_IFC] = 'e'
706 # The decoder's boilerplate declares some of the input signals as
707 # optional, but only to support both serial and parallel variants.
708 # The CLK signal discriminates the two. For either variant some
709 # of the "optional" signals are not really optional for proper
710 # operation of the decoder. Check these conditions here.
711 has_clk = self.has_channel(PIN_CLK)
712 has_data_1 = self.has_channel(PIN_DIO1)
713 has_data_n = [bool(self.has_channel(pin) for pin in range(PIN_DIO1, PIN_DIO8 + 1))]
714 has_dav = self.has_channel(PIN_DAV)
715 has_atn = self.has_channel(PIN_ATN)
716 has_eoi = self.has_channel(PIN_EOI)
717 has_srq = self.has_channel(PIN_SRQ)
719 self.decode_serial(has_clk, has_data_1, has_atn, has_srq)
721 self.decode_parallel(has_data_n, has_dav, has_atn, has_eoi, has_srq)