2 ## This file is part of the libsigrokdecode project.
4 ## Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
6 ## This program is free software; you can redistribute it and/or modify
7 ## it under the terms of the GNU General Public License as published by
8 ## the Free Software Foundation; either version 3 of the License, or
9 ## (at your option) any later version.
11 ## This program is distributed in the hope that it will be useful,
12 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ## GNU General Public License for more details.
16 ## You should have received a copy of the GNU General Public License
17 ## along with this program; if not, see <http://www.gnu.org/licenses/>.
22 # - add short annotations
23 # - Signal level standard field in basic display parameters block
24 # - Additional color point descriptors
25 # - Additional standard timing descriptors
28 import sigrokdecode as srd
31 EDID_HEADER = [0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00]
42 # Pre-EDID established timing modes
63 # X:Y display aspect ratios, as used in standard timing modes
75 class Decoder(srd.Decoder):
79 longname = 'Extended Display Identification Data'
80 desc = 'Data structure describing display device capabilities.'
85 ('fields', 'EDID structure fields'),
86 ('sections', 'EDID structure sections'),
89 def __init__(self, **kwargs):
91 # Received data items, used as an index into samplenum/data
93 # Start/end sample numbers per data item
99 self.out_ann = self.register(srd.OUTPUT_ANN)
101 def decode(self, ss, es, data):
104 # We only care about actual data bytes that are read (for now).
105 if cmd != 'DATA READ':
109 self.sn.append([ss, es])
110 self.cache.append(data)
112 # self.put(ss, es, self.out_ann, [0, ['%d: [%.2x]' % (self.cnt, data)]])
114 if self.state is None:
115 # Wait for the EDID header
116 if self.cnt >= OFF_VENDOR:
117 if self.cache[-8:] == EDID_HEADER:
118 # Throw away any garbage before the header
119 self.sn = self.sn[-8:]
120 self.cache = self.cache[-8:]
123 self.put(ss, es, self.out_ann, [0, ['EDID header']])
124 elif self.state == 'edid':
125 if self.cnt == OFF_VERSION:
128 self.decode_serial(-6)
129 self.decode_mfrdate(-2)
130 elif self.cnt == OFF_BASIC:
131 version = 'EDID version: %d.%d' % (self.cache[-2], self.cache[-1])
132 self.put(ss, es, self.out_ann, [0, [version]])
133 elif self.cnt == OFF_CHROM:
134 self.decode_basicdisplay(-5)
135 elif self.cnt == OFF_EST_TIMING:
136 self.decode_chromaticity(-10)
137 elif self.cnt == OFF_STD_TIMING:
138 self.decode_est_timing(-3)
139 elif self.cnt == OFF_DET_TIMING:
140 self.decode_std_timing(-16)
141 elif self.cnt == OFF_NUM_EXT:
142 self.decode_descriptors(-72)
143 elif self.cnt == OFF_CHECKSUM:
144 self.put(ss, es, self.out_ann,
145 [0, ['Extensions present: %d' % self.cache[self.cnt-1]]])
146 elif self.cnt == OFF_CHECKSUM+1:
149 checksum += self.cache[i]
150 if checksum % 256 == 0:
154 self.put(ss, es, self.out_ann, [0, ['Checksum: %d (%s)' % (
155 self.cache[self.cnt-1], csstr)]])
156 self.state = 'extensions'
157 elif self.state == 'extensions':
160 def ann_field(self, start, end, annotation):
161 self.put(self.sn[start][0], self.sn[end][1],
162 self.out_ann, [ANN_FIELDS, [annotation]])
164 def lookup_pnpid(self, pnpid):
165 pnpid_file = os.path.join(os.path.dirname(__file__), 'pnpids.txt')
166 if os.path.exists(pnpid_file):
167 for line in open(pnpid_file).readlines():
168 if line.find(pnpid + ';') == 0:
169 return line[4:].strip()
172 def decode_vid(self, offset):
173 pnpid = chr(64 + ((self.cache[offset] & 0x7c) >> 2))
174 pnpid += chr(64 + (((self.cache[offset] & 0x03) << 3)
175 | ((self.cache[offset+1] & 0xe0) >> 5)))
176 pnpid += chr(64 + (self.cache[offset+1] & 0x1f))
177 vendor = self.lookup_pnpid(pnpid)
179 pnpid += ' (%s)' % vendor
180 self.ann_field(offset, offset+1, pnpid)
182 def decode_pid(self, offset):
183 pidstr = 'Product 0x%.2x%.2x' % (self.cache[offset+1], self.cache[offset])
184 self.ann_field(offset, offset+1, pidstr)
186 def decode_serial(self, offset):
187 serialnum = (self.cache[offset+3] << 24) \
188 + (self.cache[offset+2] << 16) \
189 + (self.cache[offset+1] << 8) \
194 if not chr(self.cache[offset+3-i]).isalnum():
197 serialstr += chr(self.cache[offset+3-i])
198 serial = serialstr if is_alnum else str(serialnum)
199 self.ann_field(offset, offset+3, 'Serial ' + serial)
201 def decode_mfrdate(self, offset):
203 if self.cache[offset]:
204 datestr += 'week %d, ' % self.cache[offset]
205 datestr += str(1990 + self.cache[offset+1])
207 self.ann_field(offset, offset+1, 'Manufactured ' + datestr)
209 def decode_basicdisplay(self, offset):
210 # Video input definition
211 vid = self.cache[offset]
214 self.ann_field(offset, offset, 'Video input: VESA DFP 1.')
217 sls = (vid & 60) >> 5
218 self.ann_field(offset, offset, 'Signal level standard: %.2x' % sls)
220 self.ann_field(offset, offset, 'Blank-to-black setup expected')
223 syncs += 'separate syncs, '
225 syncs += 'composite syncs, '
227 syncs += 'sync on green, '
229 syncs += 'Vsync serration required, '
231 self.ann_field(offset, offset, 'Supported syncs: %s' % syncs[:-2])
232 # Max horizontal/vertical image size
233 if self.cache[offset+1] != 0 and self.cache[offset+2] != 0:
234 # Projectors have this set to 0
235 sizestr = '%dx%dcm' % (self.cache[offset+1], self.cache[offset+2])
236 self.ann_field(offset+1, offset+2, 'Physical size: ' + sizestr)
237 # Display transfer characteristic (gamma)
238 if self.cache[offset+3] != 0xff:
239 gamma = (self.cache[offset+3] + 100) / 100
240 self.ann_field(offset+3, offset+3, 'Gamma: %1.2f' % gamma)
242 fs = self.cache[offset+4]
249 dpms += 'active off, '
251 self.ann_field(offset+4, offset+4, 'DPMS support: %s' % dpms[:-2])
252 dt = (fs & 0x18) >> 3
259 dtstr = 'non-RGB multicolor'
261 self.ann_field(offset+4, offset+4, 'Display type: %s' % dtstr)
263 self.ann_field(offset+4, offset+4, 'Color space: standard sRGB')
264 # Save this for when we decode the first detailed timing descriptor
265 self.have_preferred_timing = (fs & 0x02) == 0x02
270 self.ann_field(offset+4, offset+4,
271 'Generalized timing formula: %ssupported' % gft)
273 def convert_color(self, value):
274 # Convert from 10-bit packet format to float
278 outval += 2 ** -(10-i)
282 def decode_chromaticity(self, offset):
283 redx = (self.cache[offset+2] << 2) + ((self.cache[offset] & 0xc0) >> 6)
284 redy = (self.cache[offset+3] << 2) + ((self.cache[offset] & 0x30) >> 4)
285 self.ann_field(offset, offset+9, 'Chromacity red: X %1.3f, Y %1.3f' % (
286 self.convert_color(redx), self.convert_color(redy)))
288 greenx = (self.cache[offset+4] << 2) + ((self.cache[offset] & 0x0c) >> 6)
289 greeny = (self.cache[offset+5] << 2) + ((self.cache[offset] & 0x03) >> 4)
290 self.ann_field(offset, offset+9, 'Chromacity green: X %1.3f, Y %1.3f' % (
291 self.convert_color(greenx), self.convert_color(greeny)))
293 bluex = (self.cache[offset+6] << 2) + ((self.cache[offset+1] & 0xc0) >> 6)
294 bluey = (self.cache[offset+7] << 2) + ((self.cache[offset+1] & 0x30) >> 4)
295 self.ann_field(offset, offset+9, 'Chromacity blue: X %1.3f, Y %1.3f' % (
296 self.convert_color(bluex), self.convert_color(bluey)))
298 whitex = (self.cache[offset+8] << 2) + ((self.cache[offset+1] & 0x0c) >> 6)
299 whitey = (self.cache[offset+9] << 2) + ((self.cache[offset+1] & 0x03) >> 4)
300 self.ann_field(offset, offset+9, 'Chromacity white: X %1.3f, Y %1.3f' % (
301 self.convert_color(whitex), self.convert_color(whitey)))
303 def decode_est_timing(self, offset):
305 bitmap = (self.cache[offset] << 9) \
306 + (self.cache[offset+1] << 1) \
307 + ((self.cache[offset+2] & 0x80) >> 7)
310 if bitmap & (1 << (16-i)):
311 modestr += est_modes[i] + ', '
313 self.ann_field(offset, offset+2,
314 'Supported establised modes: %s' % modestr[:-2])
316 def decode_std_timing(self, offset):
318 for i in range(0, 16, 2):
319 if self.cache[offset+i] == 0x01 and self.cache[offset+i+1] == 0x01:
322 x = (self.cache[offset+i] + 31) * 8
323 ratio = (self.cache[offset+i+1] & 0xc0) >> 6
324 ratio_x, ratio_y = xy_ratio[ratio]
325 y = x / ratio_x * ratio_y
326 refresh = (self.cache[offset+i+1] & 0x3f) + 60
327 modestr += '%dx%d@%dHz, ' % (x, y, refresh)
329 self.ann_field(offset, offset+2,
330 'Supported standard modes: %s' % modestr[:-2])
332 def decode_detailed_timing(self, offset):
333 if offset == -72 and self.have_preferred_timing:
334 # Only on first detailed timing descriptor
335 section = 'Preferred'
338 section += ' timing descriptor'
339 self.put(self.sn[offset][0], self.sn[offset+18][1],
340 self.out_ann, [ANN_SECTIONS, [section]])
342 pixclock = float((self.cache[offset+1] << 8) + self.cache[offset]) / 100
343 self.ann_field(offset, offset+1, 'Pixel clock: %.2f MHz' % pixclock)
345 horiz_active = ((self.cache[offset+4] & 0xf0) << 4) + self.cache[offset+2]
346 self.ann_field(offset+2, offset+4, 'Horizontal active: %d' % horiz_active)
348 horiz_blank = ((self.cache[offset+4] & 0x0f) << 8) + self.cache[offset+3]
349 self.ann_field(offset+3, offset+4, 'Horizontal blanking: %d' % horiz_blank)
351 vert_active = ((self.cache[offset+7] & 0xf0) << 4) + self.cache[offset+5]
352 self.ann_field(offset+5, offset+7, 'Vertical active: %d' % vert_active)
354 vert_blank = ((self.cache[offset+7] & 0x0f) << 8) + self.cache[offset+6]
355 self.ann_field(offset+6, offset+7, 'Vertical blanking: %d' % vert_blank)
357 horiz_sync_off = ((self.cache[offset+11] & 0xc0) << 2) + self.cache[offset+8]
358 self.ann_field(offset+8, offset+11, 'Horizontal sync offset: %d' % horiz_sync_off)
360 horiz_sync_pw = ((self.cache[offset+11] & 0x30) << 4) + self.cache[offset+9]
361 self.ann_field(offset+9, offset+11, 'Horizontal sync pulse width: %d' % horiz_sync_pw)
363 vert_sync_off = ((self.cache[offset+11] & 0x0c) << 2) \
364 + ((self.cache[offset+10] & 0xf0) >> 4)
365 self.ann_field(offset+10, offset+11, 'Vertical sync offset: %d' % vert_sync_off)
367 vert_sync_pw = ((self.cache[offset+11] & 0x03) << 4) \
368 + (self.cache[offset+10] & 0x0f)
369 self.ann_field(offset+10, offset+11, 'Vertical sync pulse width: %d' % vert_sync_pw)
371 horiz_size = ((self.cache[offset+14] & 0xf0) << 4) + self.cache[offset+12]
372 vert_size = ((self.cache[offset+14] & 0x0f) << 8) + self.cache[offset+13]
373 self.ann_field(offset+12, offset+14, 'Physical size: %dx%dmm' % (horiz_size, vert_size))
375 horiz_border = self.cache[offset+15]
377 self.ann_field(offset+15, offset+15, 'Horizontal border: %d pixels' % horiz_border)
378 vert_border = self.cache[offset+16]
380 self.ann_field(offset+16, offset+16, 'Vertical border: %d lines' % vert_border)
383 if self.cache[offset+17] & 0x80:
384 features += 'interlaced, '
385 stereo = (self.cache[offset+17] & 0x60) >> 5
387 if self.cache[offset+17] & 0x01:
388 features += '2-way interleaved stereo ('
389 features += ['right image on even lines',
390 'left image on even lines',
391 'side-by-side'][stereo-1]
394 features += 'field sequential stereo ('
395 features += ['right image on sync=1', 'left image on sync=1',
396 '4-way interleaved'][stereo-1]
398 sync = (self.cache[offset+17] & 0x18) >> 3
399 sync2 = (self.cache[offset+17] & 0x06) >> 1
400 posneg = ['negative', 'positive']
401 features += 'sync type '
403 features += 'analog composite (serrate on RGB)'
405 features += 'bipolar analog composite (serrate on RGB)'
407 features += 'digital composite (serrate on composite polarity ' \
408 + (posneg[sync2 & 0x01]) + ')'
410 features += 'digital separate ('
411 features += 'Vsync polarity ' + (posneg[(sync2 & 0x02) >> 1])
412 features += ', Hsync polarity ' + (posneg[sync2 & 0x01])
415 self.ann_field(offset+17, offset+17, features[:-2])
417 def decode_descriptor(self, offset):
418 tag = self.cache[offset+3]
420 # Monitor serial number
421 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
422 self.ann_field(offset, offset+17, 'Serial number: %s' % text.strip())
425 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
426 self.ann_field(offset, offset+17, 'Info: %s' % text.strip())
429 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
430 self.ann_field(offset, offset+17, 'Model name: %s' % text.strip())
432 # Monitor range limits
433 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
434 [ANN_SECTIONS, ['Monitor range limits']])
435 self.ann_field(offset+5, offset+5, 'Minimum vertical rate: %dHz' %
436 self.cache[offset+5])
437 self.ann_field(offset+6, offset+6, 'Maximum vertical rate: %dHz' %
438 self.cache[offset+6])
439 self.ann_field(offset+7, offset+7, 'Minimum horizontal rate: %dkHz' %
440 self.cache[offset+7])
441 self.ann_field(offset+8, offset+8, 'Maximum horizontal rate: %dkHz' %
442 self.cache[offset+8])
443 self.ann_field(offset+9, offset+9, 'Maximum pixel clock: %dMHz' %
444 (self.cache[offset+9] * 10))
445 if self.cache[offset+10] == 0x02:
446 # Secondary GTF curve supported
447 self.ann_field(offset+10, offset+17, 'Secondary timing formula supported')
449 # Additional color point data
450 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
451 [ANN_SECTIONS, ['Additional color point data']])
453 # Additional standard timing definitions
454 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
455 [ANN_SECTIONS, ['Additional standard timing definitions']])
457 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
458 [ANN_SECTIONS, ['Unknown descriptor']])
460 def decode_descriptors(self, offset):
461 # 4 consecutive 18-byte descriptor blocks
462 for i in range(offset, 0, 18):
463 if self.cache[i] != 0 and self.cache[i+1] != 0:
464 self.decode_detailed_timing(i)
466 if self.cache[i+2] == 0 or self.cache[i+4] == 0:
467 self.decode_descriptor(i)