2 ## This file is part of the sigrok 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/>.
21 EDID 1.3 structure decoder.
24 https://en.wikipedia.org/wiki/Extended_display_identification_data
29 # - Signal level standard field in basic display parameters block
30 # - Additional color point descriptors
31 # - Additional standard timing descriptors
34 import sigrokdecode as srd
37 EDID_HEADER = [0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00]
49 # Pre-EDID established timing modes
70 # X:Y display aspect ratios, as used in standard timing modes
82 class Decoder(srd.Decoder):
86 longname = 'Extended display identification data'
87 desc = 'A data structure describing the capabilities of a display device.'
93 ['EDID fields', 'EDID structure fields'],
94 ['EDID sections', 'EDID structure sections'],
97 def __init__(self, **kwargs):
99 # Received data items, used as an index into samplenum/data
101 # Start/end sample numbers per data item
106 def start(self, metadata):
107 self.out_ann = self.add(srd.OUTPUT_ANN, 'edid')
109 def decode(self, ss, es, data):
110 if type(data) != int:
111 raise Exception('malformed ddc2 input: expected 1 byte')
113 self.sn.append( [ss, es] )
114 self.cache.append(data)
116 if self.state is None:
117 # Wait for the EDID header
118 if self.cnt >= OFF_VENDOR:
119 if self.cache[-8:] == EDID_HEADER:
120 # Throw away any garbage before the header
121 self.sn = self.sn[-8:]
122 self.cache = self.cache[-8:]
124 self.put(ss, es, self.out_ann, [0, ["EDID header"]])
125 elif self.state == 'edid':
126 if self.cnt == OFF_VERSION:
129 self.decode_serial(-6)
130 self.decode_mfrdate(-2)
131 elif self.cnt == OFF_BASIC:
132 version = "EDID version: %d.%d" % (self.cache[-2], self.cache[-1])
133 self.put(ss, es, self.out_ann, [0, [version]])
134 elif self.cnt == OFF_CHROM:
135 self.decode_basicdisplay(-5)
136 elif self.cnt == OFF_EST_TIMING:
137 self.decode_chromaticity(-10)
138 elif self.cnt == OFF_STD_TIMING:
139 self.decode_est_timing(-3)
140 elif self.cnt == OFF_DET_TIMING:
141 self.decode_std_timing(-16)
142 elif self.cnt == OFF_NUM_EXT:
143 self.decode_descriptors(-72)
144 elif self.cnt == OFF_CHECKSUM:
145 self.put(ss, es, self.out_ann, [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], self.out_ann, [ANN_FIELDS, [annotation]])
163 def lookup_pnpid(self, pnpid):
164 pnpid_file = os.path.dirname(__file__) + '/pnpids.txt'
165 if os.path.exists(pnpid_file):
166 for line in open(pnpid_file).readlines():
167 if line.find(pnpid + ';') == 0:
168 return line[4:].strip()
171 def decode_vid(self, offset):
172 pnpid = chr(64 + ((self.cache[offset] & 0x7c) >> 2))
173 pnpid += chr(64 + (((self.cache[offset] & 0x03) << 3)
174 | ((self.cache[offset+1] & 0xe0) >> 5)))
175 pnpid += chr(64 + (self.cache[offset+1] & 0x1f))
176 vendor = self.lookup_pnpid(pnpid)
178 pnpid += " (%s)" % vendor
179 self.ann_field(offset, offset+1, pnpid)
181 def decode_pid(self, offset):
182 pidstr = "Product 0x%.2x%.2x" % (self.cache[offset+1], self.cache[offset])
183 self.ann_field(offset, offset+1, pidstr)
185 def decode_serial(self, offset):
186 serialnum = (self.cache[offset+3] << 24) \
187 + (self.cache[offset+2] << 16) \
188 + (self.cache[offset+1] << 8) \
193 if not chr(self.cache[offset+3-i]).isalnum():
196 serialstr += chr(self.cache[offset+3-i])
200 serial = str(serialnum)
201 self.ann_field(offset, offset+3, "Serial " + serial)
203 def decode_mfrdate(self, offset):
205 if self.cache[offset]:
206 datestr += "week %d, " % self.cache[offset]
207 datestr += str(1990 + self.cache[offset+1])
209 self.ann_field(offset, offset+1, "Manufactured " + datestr)
211 def decode_basicdisplay(self, offset):
212 # Video input definition
213 vid = self.cache[offset]
216 self.ann_field(offset, offset, "Video input: VESA DFP 1.")
219 sls = (vid & 60) >> 5
220 self.ann_field(offset, offset, "Signal level standard: %.2x" % sls)
222 self.ann_field(offset, offset, "Blank-to-black setup expected")
225 syncs += 'separate syncs, '
227 syncs += 'composite syncs, '
229 syncs += 'sync on green, '
231 syncs += 'Vsync serration required, '
233 self.ann_field(offset, offset, "Supported syncs: %s" % syncs[:-2])
234 # Max horizontal/vertical image size
235 if self.cache[offset+1] != 0 and self.cache[offset+2] != 0:
236 # Projectors have this set to 0
237 sizestr = "%dx%dcm" % (self.cache[offset+1], self.cache[offset+2])
238 self.ann_field(offset+1, offset+2, "Physical size: " + sizestr)
239 # Display transfer characteristic (gamma)
240 if self.cache[offset+3] != 0xff:
241 gamma = (self.cache[offset+3] + 100) / 100
242 self.ann_field(offset+3, offset+3, "Gamma: %1.2f" % gamma)
244 fs = self.cache[offset+4]
251 dpms += 'active off, '
253 self.ann_field(offset+4, offset+4, "DPMS support: %s" % dpms[:-2])
254 dt = (fs & 0x18) >> 3
261 dtstr = 'non-RGB multicolor'
263 self.ann_field(offset+4, offset+4, "Display type: %s" % dtstr)
265 self.ann_field(offset+4, offset+4, "Color space: standard sRGB")
266 # Save this for when we decode the first detailed timing descriptor
267 self.have_preferred_timing = (fs & 0x02) == 0x02
272 self.ann_field(offset+4, offset+4, "Generalized timing formula: %ssupported" % gft)
274 def convert_color(self, value):
275 # Convert from 10-bit packet format to float
279 outval += 2 ** -(10-i)
283 def decode_chromaticity(self, offset):
284 redx = (self.cache[offset+2] << 2) + ((self.cache[offset] & 0xc0) >> 6)
285 redy = (self.cache[offset+3] << 2) + ((self.cache[offset] & 0x30) >> 4)
286 self.ann_field(offset, offset+9, "Chromacity red: X %1.3f, Y %1.3f" % (
287 self.convert_color(redx), self.convert_color(redy)))
289 greenx = (self.cache[offset+4] << 2) + ((self.cache[offset] & 0x0c) >> 6)
290 greeny = (self.cache[offset+5] << 2) + ((self.cache[offset] & 0x03) >> 4)
291 self.ann_field(offset, offset+9, "Chromacity green: X %1.3f, Y %1.3f" % (
292 self.convert_color(greenx), self.convert_color(greeny)))
294 bluex = (self.cache[offset+6] << 2) + ((self.cache[offset+1] & 0xc0) >> 6)
295 bluey = (self.cache[offset+7] << 2) + ((self.cache[offset+1] & 0x30) >> 4)
296 self.ann_field(offset, offset+9, "Chromacity blue: X %1.3f, Y %1.3f" % (
297 self.convert_color(bluex), self.convert_color(bluey)))
299 whitex = (self.cache[offset+8] << 2) + ((self.cache[offset+1] & 0x0c) >> 6)
300 whitey = (self.cache[offset+9] << 2) + ((self.cache[offset+1] & 0x03) >> 4)
301 self.ann_field(offset, offset+9, "Chromacity white: X %1.3f, Y %1.3f" % (
302 self.convert_color(whitex), self.convert_color(whitey)))
304 def decode_est_timing(self, offset):
306 bitmap = (self.cache[offset] << 9) \
307 + (self.cache[offset+1] << 1) \
308 + ((self.cache[offset+2] & 0x80) >> 7)
311 if bitmap & (1 << (16-i)):
312 modestr += est_modes[i] + ', '
314 self.ann_field(offset, offset+2, "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, "Supported standard modes: %s" % modestr[:-2])
331 def decode_detailed_timing(self, offset):
332 if offset == -72 and self.have_preferred_timing:
333 # Only on first detailed timing descriptor
334 section = 'Preferred'
337 section += ' timing descriptor'
338 self.put(self.sn[offset][0], self.sn[offset+18][1],
339 self.out_ann, [ANN_SECTIONS, [section]])
341 pixclock = float((self.cache[offset+1] << 8) + self.cache[offset]) / 100
342 self.ann_field(offset, offset+1, "Pixel clock: %.2f MHz" % pixclock)
344 horiz_active = ((self.cache[offset+4] & 0xf0) << 4) + self.cache[offset+2]
345 self.ann_field(offset+2, offset+4, "Horizontal active: %d" % horiz_active)
347 horiz_blank = ((self.cache[offset+4] & 0x0f) << 8) + self.cache[offset+3]
348 self.ann_field(offset+3, offset+4, "Horizontal blanking: %d" % horiz_blank)
350 vert_active = ((self.cache[offset+7] & 0xf0) << 4) + self.cache[offset+5]
351 self.ann_field(offset+5, offset+7, "Vertical active: %d" % vert_active)
353 vert_blank = ((self.cache[offset+7] & 0x0f) << 8) + self.cache[offset+6]
354 self.ann_field(offset+6, offset+7, "Vertical blanking: %d" % vert_blank)
356 horiz_sync_off = ((self.cache[offset+11] & 0xc0) << 2) + self.cache[offset+8]
357 self.ann_field(offset+8, offset+11, "Horizontal sync offset: %d" % horiz_sync_off)
359 horiz_sync_pw = ((self.cache[offset+11] & 0x30) << 4) + self.cache[offset+9]
360 self.ann_field(offset+9, offset+11, "Horizontal sync pulse width: %d" % horiz_sync_pw)
362 vert_sync_off = ((self.cache[offset+11] & 0x0c) << 2) \
363 + ((self.cache[offset+10] & 0xf0) >> 4)
364 self.ann_field(offset+10, offset+11, "Vertical sync offset: %d" % vert_sync_off)
366 vert_sync_pw = ((self.cache[offset+11] & 0x03) << 4) \
367 + (self.cache[offset+10] & 0x0f)
368 self.ann_field(offset+10, offset+11, "Vertical sync pulse width: %d" % vert_sync_pw)
370 horiz_size = ((self.cache[offset+14] & 0xf0) << 4) + self.cache[offset+12]
371 vert_size = ((self.cache[offset+14] & 0x0f) << 8) + self.cache[offset+13]
372 self.ann_field(offset+12, offset+14, "Physical size: %dx%dmm" % (horiz_size, vert_size))
374 horiz_border = self.cache[offset+15]
376 self.ann_field(offset+15, offset+15, "Horizontal border: %d pixels" % horiz_border)
377 vert_border = self.cache[offset+16]
379 self.ann_field(offset+16, offset+16, "Vertical border: %d lines" % vert_border)
382 if self.cache[offset+17] & 0x80:
383 features += 'interlaced, '
384 stereo = (self.cache[offset+17] & 0x60) >> 5
386 if self.cache[offset+17] & 0x01:
387 features += '2-way interleaved stereo ('
388 features += ['right image on even lines', 'left image on even lines',
389 'side-by-side'][stereo-1]
392 features += 'field sequential stereo ('
393 features += ['right image on sync=1', 'left image on sync=1',
394 '4-way interleaved'][stereo-1]
396 sync = (self.cache[offset+17] & 0x18) >> 3
397 sync2 = (self.cache[offset+17] & 0x06) >> 1
398 posneg = ['negative', 'positive']
399 features += 'sync type '
401 features += 'analog composite (serrate on RGB)'
403 features += 'bipolar analog composite (serrate on RGB)'
405 features += 'digital composite (serrate on composite polarity ' \
406 + (posneg[sync2 & 0x01]) + ')'
408 features += 'digital separate ('
409 features += 'Vsync polarity ' + (posneg[sync2 >> 1])
410 features += ', Hsync polarity ' + (posneg[sync2 & 0x01])
413 self.ann_field(offset+17, offset+17, features[:-2])
415 def decode_descriptor(self, offset):
416 tag = self.cache[offset+3]
418 # Monitor serial number
419 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
420 self.ann_field(offset, offset+17, "Serial number: %s" % text.strip())
423 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
424 self.ann_field(offset, offset+17, "Info: %s" % text.strip())
427 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
428 self.ann_field(offset, offset+17, "Model name: %s" % text.strip())
430 # Monitor range limits
431 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
432 [ANN_SECTIONS, ["Monitor range limits"]])
433 self.ann_field(offset+5, offset+5, "Minimum vertical rate: %dHz" %
434 self.cache[offset+5])
435 self.ann_field(offset+6, offset+6, "Maximum vertical rate: %dHz" %
436 self.cache[offset+6])
437 self.ann_field(offset+7, offset+7, "Minimum horizontal rate: %dkHz" %
438 self.cache[offset+7])
439 self.ann_field(offset+8, offset+8, "Maximum horizontal rate: %dkHz" %
440 self.cache[offset+8])
441 self.ann_field(offset+9, offset+9, "Maximum pixel clock: %dMHz" %
442 (self.cache[offset+9] * 10))
443 if self.cache[offset+10] == 0x02:
444 # Secondary GTF curve supported
445 self.ann_field(offset+10, offset+17, "Secondary timing formula supported")
447 # Additional color point data
448 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
449 [ANN_SECTIONS, ["Additional color point data"]])
451 # Additional standard timing definitions
452 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
453 [ANN_SECTIONS, ["Additional standard timing definitions"]])
455 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
456 [ANN_SECTIONS, ["Unknown descriptor"]])
458 def decode_descriptors(self, offset):
459 # 4 consecutive 18-byte descriptor blocks
460 for i in range(offset, 0, 18):
461 if self.cache[i] != 0 and self.cache[i+1] != 0:
462 self.decode_detailed_timing(i)
464 if self.cache[i+2] == 0 or self.cache[i+4] == 0 or True:
465 self.decode_descriptor(i)