-
Notifications
You must be signed in to change notification settings - Fork 0
/
micropyGPS.py
830 lines (684 loc) · 28.8 KB
/
micropyGPS.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
"""
# MicropyGPS - a GPS NMEA sentence parser for Micropython/Python 3.X
# Copyright (c) 2017 Michael Calvin McCoy (calvin.mccoy@protonmail.com)
# The MIT License (MIT) - see LICENSE file
"""
# TODO:
# Time Since First Fix
# Distance/Time to Target
# More Helper Functions
# Dynamically limit sentences types to parse
from math import floor, modf
# Import utime or time for fix time handling
try:
# Assume running on MicroPython
import utime
except ImportError:
# Otherwise default to time module for non-embedded implementations
# Should still support millisecond resolution.
import time
class MicropyGPS(object):
"""GPS NMEA Sentence Parser. Creates object that stores all relevant GPS data and statistics.
Parses sentences one character at a time using update(). """
# Max Number of Characters a valid sentence can be (based on GGA sentence)
SENTENCE_LIMIT = 90
__HEMISPHERES = ('N', 'S', 'E', 'W')
__NO_FIX = 1
__FIX_2D = 2
__FIX_3D = 3
__DIRECTIONS = ('N', 'NNE', 'NE', 'ENE', 'E', 'ESE', 'SE', 'SSE', 'S', 'SSW', 'SW', 'WSW', 'W',
'WNW', 'NW', 'NNW')
__MONTHS = ('January', 'February', 'March', 'April', 'May',
'June', 'July', 'August', 'September', 'October',
'November', 'December')
def __init__(self, local_offset=0, location_formatting='ddm'):
"""
Setup GPS Object Status Flags, Internal Data Registers, etc
local_offset (int): Timzone Difference to UTC
location_formatting (str): Style For Presenting Longitude/Latitude:
Decimal Degree Minute (ddm) - 40° 26.767′ N
Degrees Minutes Seconds (dms) - 40° 26′ 46″ N
Decimal Degrees (dd) - 40.446° N
"""
#####################
# Object Status Flags
self.sentence_active = False
self.active_segment = 0
self.process_crc = False
self.gps_segments = []
self.crc_xor = 0
self.char_count = 0
self.fix_time = 0
#####################
# Sentence Statistics
self.crc_fails = 0
self.clean_sentences = 0
self.parsed_sentences = 0
#####################
# Logging Related
self.log_handle = None
self.log_en = False
#####################
# Data From Sentences
# Time
self.timestamp = [0, 0, 0.0]
self.date = [0, 0, 0]
self.local_offset = local_offset
# Position/Motion
self._latitude = [0, 0.0, 'N']
self._longitude = [0, 0.0, 'W']
self.coord_format = location_formatting
self.speed = [0.0, 0.0, 0.0]
self.course = 0.0
self.altitude = 0.0
self.geoid_height = 0.0
# GPS Info
self.satellites_in_view = 0
self.satellites_in_use = 0
self.satellites_used = []
self.last_sv_sentence = 0
self.total_sv_sentences = 0
self.satellite_data = dict()
self.hdop = 0.0
self.pdop = 0.0
self.vdop = 0.0
self.valid = False
self.fix_stat = 0
self.fix_type = 1
########################################
# Coordinates Translation Functions
########################################
@property
def latitude(self):
"""Format Latitude Data Correctly"""
if self.coord_format == 'dd':
decimal_degrees = self._latitude[0] + (self._latitude[1] / 60)
return [decimal_degrees, self._latitude[2]]
elif self.coord_format == 'dms':
minute_parts = modf(self._latitude[1])
seconds = round(minute_parts[0] * 60)
return [self._latitude[0], int(minute_parts[1]), seconds, self._latitude[2]]
else:
return self._latitude
@property
def longitude(self):
"""Format Longitude Data Correctly"""
if self.coord_format == 'dd':
decimal_degrees = self._longitude[0] + (self._longitude[1] / 60)
return [decimal_degrees, self._longitude[2]]
elif self.coord_format == 'dms':
minute_parts = modf(self._longitude[1])
seconds = round(minute_parts[0] * 60)
return [self._longitude[0], int(minute_parts[1]), seconds, self._longitude[2]]
else:
return self._longitude
########################################
# Logging Related Functions
########################################
def start_logging(self, target_file, mode="append"):
"""
Create GPS data log object
"""
# Set Write Mode Overwrite or Append
mode_code = 'w' if mode == 'new' else 'a'
try:
self.log_handle = open(target_file, mode_code)
except AttributeError:
print("Invalid FileName")
return False
self.log_en = True
return True
def stop_logging(self):
"""
Closes the log file handler and disables further logging
"""
try:
self.log_handle.close()
except AttributeError:
print("Invalid Handle")
return False
self.log_en = False
return True
def write_log(self, log_string):
"""Attempts to write the last valid NMEA sentence character to the active file handler
"""
try:
self.log_handle.write(log_string)
except TypeError:
return False
return True
########################################
# Sentence Parsers
########################################
def gprmc(self):
"""Parse Recommended Minimum Specific GPS/Transit data (RMC)Sentence.
Updates UTC timestamp, latitude, longitude, Course, Speed, Date, and fix status
"""
# UTC Timestamp
try:
utc_string = self.gps_segments[1]
if utc_string: # Possible timestamp found
hours = (int(utc_string[0:2]) + self.local_offset) % 24
minutes = int(utc_string[2:4])
seconds = float(utc_string[4:])
self.timestamp = [hours, minutes, seconds]
else: # No Time stamp yet
self.timestamp = [0, 0, 0.0]
except ValueError: # Bad Timestamp value present
return False
# Date stamp
try:
date_string = self.gps_segments[9]
# Date string printer function assumes to be year >=2000,
# date_string() must be supplied with the correct century argument to display correctly
if date_string: # Possible date stamp found
day = int(date_string[0:2])
month = int(date_string[2:4])
year = int(date_string[4:6])
self.date = (day, month, year)
else: # No Date stamp yet
self.date = (0, 0, 0)
except ValueError: # Bad Date stamp value present
return False
# Check Receiver Data Valid Flag
if self.gps_segments[2] == 'A': # Data from Receiver is Valid/Has Fix
# Longitude / Latitude
try:
# Latitude
l_string = self.gps_segments[3]
lat_degs = int(l_string[0:2])
lat_mins = float(l_string[2:])
lat_hemi = self.gps_segments[4]
# Longitude
l_string = self.gps_segments[5]
lon_degs = int(l_string[0:3])
lon_mins = float(l_string[3:])
lon_hemi = self.gps_segments[6]
except ValueError:
return False
if lat_hemi not in self.__HEMISPHERES:
return False
if lon_hemi not in self.__HEMISPHERES:
return False
# Speed
try:
spd_knt = float(self.gps_segments[7])
except ValueError:
return False
# Course
try:
if self.gps_segments[8]:
course = float(self.gps_segments[8])
else:
course = 0.0
except ValueError:
return False
# TODO - Add Magnetic Variation
# Update Object Data
self._latitude = [lat_degs, lat_mins, lat_hemi]
self._longitude = [lon_degs, lon_mins, lon_hemi]
# Include mph and hm/h
self.speed = [spd_knt, spd_knt * 1.151, spd_knt * 1.852]
self.course = course
self.valid = True
# Update Last Fix Time
self.new_fix_time()
else: # Clear Position Data if Sentence is 'Invalid'
self._latitude = [0, 0.0, 'N']
self._longitude = [0, 0.0, 'W']
self.speed = [0.0, 0.0, 0.0]
self.course = 0.0
self.valid = False
return True
def gpgll(self):
"""Parse Geographic Latitude and Longitude (GLL)Sentence. Updates UTC timestamp, latitude,
longitude, and fix status"""
# UTC Timestamp
try:
utc_string = self.gps_segments[5]
if utc_string: # Possible timestamp found
hours = (int(utc_string[0:2]) + self.local_offset) % 24
minutes = int(utc_string[2:4])
seconds = float(utc_string[4:])
self.timestamp = [hours, minutes, seconds]
else: # No Time stamp yet
self.timestamp = [0, 0, 0.0]
except ValueError: # Bad Timestamp value present
return False
# Check Receiver Data Valid Flag
if self.gps_segments[6] == 'A': # Data from Receiver is Valid/Has Fix
# Longitude / Latitude
try:
# Latitude
l_string = self.gps_segments[1]
lat_degs = int(l_string[0:2])
lat_mins = float(l_string[2:])
lat_hemi = self.gps_segments[2]
# Longitude
l_string = self.gps_segments[3]
lon_degs = int(l_string[0:3])
lon_mins = float(l_string[3:])
lon_hemi = self.gps_segments[4]
except ValueError:
return False
if lat_hemi not in self.__HEMISPHERES:
return False
if lon_hemi not in self.__HEMISPHERES:
return False
# Update Object Data
self._latitude = [lat_degs, lat_mins, lat_hemi]
self._longitude = [lon_degs, lon_mins, lon_hemi]
self.valid = True
# Update Last Fix Time
self.new_fix_time()
else: # Clear Position Data if Sentence is 'Invalid'
self._latitude = [0, 0.0, 'N']
self._longitude = [0, 0.0, 'W']
self.valid = False
return True
def gpvtg(self):
"""Parse Track Made Good and Ground Speed (VTG) Sentence. Updates speed and course"""
try:
course = float(self.gps_segments[1]) if self.gps_segments[1] else 0.0
spd_knt = float(self.gps_segments[5]) if self.gps_segments[5] else 0.0
except ValueError:
return False
# Include mph and km/h
self.speed = (spd_knt, spd_knt * 1.151, spd_knt * 1.852)
self.course = course
return True
def gpgga(self):
"""Parse Global Positioning System Fix Data (GGA) Sentence. Updates UTC timestamp, latitude, longitude,
fix status, satellites in use, Horizontal Dilution of Precision (HDOP), altitude, geoid height and fix status"""
try:
# UTC Timestamp
utc_string = self.gps_segments[1]
# Skip timestamp if receiver doesn't have on yet
if utc_string:
hours = (int(utc_string[0:2]) + self.local_offset) % 24
minutes = int(utc_string[2:4])
seconds = float(utc_string[4:])
else:
hours = 0
minutes = 0
seconds = 0.0
# Number of Satellites in Use
satellites_in_use = int(self.gps_segments[7])
# Get Fix Status
fix_stat = int(self.gps_segments[6])
except (ValueError, IndexError):
return False
try:
# Horizontal Dilution of Precision
hdop = float(self.gps_segments[8])
except (ValueError, IndexError):
hdop = 0.0
# Process Location and Speed Data if Fix is GOOD
if fix_stat:
# Longitude / Latitude
try:
# Latitude
l_string = self.gps_segments[2]
lat_degs = int(l_string[0:2])
lat_mins = float(l_string[2:])
lat_hemi = self.gps_segments[3]
# Longitude
l_string = self.gps_segments[4]
lon_degs = int(l_string[0:3])
lon_mins = float(l_string[3:])
lon_hemi = self.gps_segments[5]
except ValueError:
return False
if lat_hemi not in self.__HEMISPHERES:
return False
if lon_hemi not in self.__HEMISPHERES:
return False
# Altitude / Height Above Geoid
try:
altitude = float(self.gps_segments[9])
geoid_height = float(self.gps_segments[11])
except ValueError:
altitude = 0
geoid_height = 0
# Update Object Data
self._latitude = [lat_degs, lat_mins, lat_hemi]
self._longitude = [lon_degs, lon_mins, lon_hemi]
self.altitude = altitude
self.geoid_height = geoid_height
# Update Object Data
self.timestamp = [hours, minutes, seconds]
self.satellites_in_use = satellites_in_use
self.hdop = hdop
self.fix_stat = fix_stat
# If Fix is GOOD, update fix timestamp
if fix_stat:
self.new_fix_time()
return True
def gpgsa(self):
"""Parse GNSS DOP and Active Satellites (GSA) sentence. Updates GPS fix type, list of satellites used in
fix calculation, Position Dilution of Precision (PDOP), Horizontal Dilution of Precision (HDOP), Vertical
Dilution of Precision, and fix status"""
# Fix Type (None,2D or 3D)
try:
fix_type = int(self.gps_segments[2])
except ValueError:
return False
# Read All (up to 12) Available PRN Satellite Numbers
sats_used = []
for sats in range(12):
sat_number_str = self.gps_segments[3 + sats]
if sat_number_str:
try:
sat_number = int(sat_number_str)
sats_used.append(sat_number)
except ValueError:
return False
else:
break
# PDOP,HDOP,VDOP
try:
pdop = float(self.gps_segments[15])
hdop = float(self.gps_segments[16])
vdop = float(self.gps_segments[17])
except ValueError:
return False
# Update Object Data
self.fix_type = fix_type
# If Fix is GOOD, update fix timestamp
if fix_type > self.__NO_FIX:
self.new_fix_time()
self.satellites_used = sats_used
self.hdop = hdop
self.vdop = vdop
self.pdop = pdop
return True
def gpgsv(self):
"""Parse Satellites in View (GSV) sentence. Updates number of SV Sentences,the number of the last SV sentence
parsed, and data on each satellite present in the sentence"""
try:
num_sv_sentences = int(self.gps_segments[1])
current_sv_sentence = int(self.gps_segments[2])
sats_in_view = int(self.gps_segments[3])
except ValueError:
return False
# Create a blank dict to store all the satellite data from this sentence in:
# satellite PRN is key, tuple containing telemetry is value
satellite_dict = dict()
# Calculate Number of Satelites to pull data for and thus how many segment positions to read
if num_sv_sentences == current_sv_sentence:
# Last sentence may have 1-4 satellites; 5 - 20 positions
sat_segment_limit = (sats_in_view - ((num_sv_sentences - 1) * 4)) * 5
else:
sat_segment_limit = 20 # Non-last sentences have 4 satellites and thus read up to position 20
# Try to recover data for up to 4 satellites in sentence
for sats in range(4, sat_segment_limit, 4):
# If a PRN is present, grab satellite data
if self.gps_segments[sats]:
try:
sat_id = int(self.gps_segments[sats])
except (ValueError,IndexError):
return False
try: # elevation can be null (no value) when not tracking
elevation = int(self.gps_segments[sats+1])
except (ValueError,IndexError):
elevation = None
try: # azimuth can be null (no value) when not tracking
azimuth = int(self.gps_segments[sats+2])
except (ValueError,IndexError):
azimuth = None
try: # SNR can be null (no value) when not tracking
snr = int(self.gps_segments[sats+3])
except (ValueError,IndexError):
snr = None
# If no PRN is found, then the sentence has no more satellites to read
else:
break
# Add Satellite Data to Sentence Dict
satellite_dict[sat_id] = (elevation, azimuth, snr)
# Update Object Data
self.total_sv_sentences = num_sv_sentences
self.last_sv_sentence = current_sv_sentence
self.satellites_in_view = sats_in_view
# For a new set of sentences, we either clear out the existing sat data or
# update it as additional SV sentences are parsed
if current_sv_sentence == 1:
self.satellite_data = satellite_dict
else:
self.satellite_data.update(satellite_dict)
return True
##########################################
# Data Stream Handler Functions
##########################################
def new_sentence(self):
"""Adjust Object Flags in Preparation for a New Sentence"""
self.gps_segments = ['']
self.active_segment = 0
self.crc_xor = 0
self.sentence_active = True
self.process_crc = True
self.char_count = 0
def update(self, new_char):
"""Process a new input char and updates GPS object if necessary based on special characters ('$', ',', '*')
Function builds a list of received string that are validate by CRC prior to parsing by the appropriate
sentence function. Returns sentence type on successful parse, None otherwise"""
valid_sentence = False
# Validate new_char is a printable char
ascii_char = ord(new_char)
if 10 <= ascii_char <= 126:
self.char_count += 1
# Write Character to log file if enabled
if self.log_en:
self.write_log(new_char)
# Check if a new string is starting ($)
if new_char == '$':
self.new_sentence()
return None
elif self.sentence_active:
# Check if sentence is ending (*)
if new_char == '*':
self.process_crc = False
self.active_segment += 1
self.gps_segments.append('')
return None
# Check if a section is ended (,), Create a new substring to feed
# characters to
elif new_char == ',':
self.active_segment += 1
self.gps_segments.append('')
# Store All Other printable character and check CRC when ready
else:
self.gps_segments[self.active_segment] += new_char
# When CRC input is disabled, sentence is nearly complete
if not self.process_crc:
if len(self.gps_segments[self.active_segment]) == 2:
try:
final_crc = int(self.gps_segments[self.active_segment], 16)
if self.crc_xor == final_crc:
valid_sentence = True
else:
self.crc_fails += 1
except ValueError:
pass # CRC Value was deformed and could not have been correct
# Update CRC
if self.process_crc:
self.crc_xor ^= ascii_char
# If a Valid Sentence Was received and it's a supported sentence, then parse it!!
if valid_sentence:
self.clean_sentences += 1 # Increment clean sentences received
self.sentence_active = False # Clear Active Processing Flag
if self.gps_segments[0] in self.supported_sentences:
# parse the Sentence Based on the message type, return True if parse is clean
if self.supported_sentences[self.gps_segments[0]](self):
# Let host know that the GPS object was updated by returning parsed sentence type
self.parsed_sentences += 1
return self.gps_segments[0]
# Check that the sentence buffer isn't filling up with Garage waiting for the sentence to complete
if self.char_count > self.SENTENCE_LIMIT:
self.sentence_active = False
# Tell Host no new sentence was parsed
return None
def new_fix_time(self):
"""Updates a high resolution counter with current time when fix is updated. Currently only triggered from
GGA, GSA and RMC sentences"""
try:
self.fix_time = utime.ticks_ms()
except NameError:
self.fix_time = time.time()
#########################################
# User Helper Functions
# These functions make working with the GPS object data easier
#########################################
def satellite_data_updated(self):
"""
Checks if the all the GSV sentences in a group have been read, making satellite data complete
:return: boolean
"""
if self.total_sv_sentences > 0 and self.total_sv_sentences == self.last_sv_sentence:
return True
else:
return False
def unset_satellite_data_updated(self):
"""
Mark GSV sentences as read indicating the data has been used and future updates are fresh
"""
self.last_sv_sentence = 0
def satellites_visible(self):
"""
Returns a list of of the satellite PRNs currently visible to the receiver
:return: list
"""
return list(self.satellite_data.keys())
def time_since_fix(self):
"""Returns number of millisecond since the last sentence with a valid fix was parsed. Returns 0 if
no fix has been found"""
# Test if a Fix has been found
if self.fix_time == 0:
return -1
# Try calculating fix time using utime; if not running MicroPython
# time.time() returns a floating point value in secs
try:
current = utime.ticks_diff(utime.ticks_ms(), self.fix_time)
except NameError:
current = (time.time() - self.fix_time) * 1000 # ms
return current
def compass_direction(self):
"""
Determine a cardinal or inter-cardinal direction based on current course.
:return: string
"""
# Calculate the offset for a rotated compass
if self.course >= 348.75:
offset_course = 360 - self.course
else:
offset_course = self.course + 11.25
# Each compass point is separated by 22.5 degrees, divide to find lookup value
dir_index = floor(offset_course / 22.5)
final_dir = self.__DIRECTIONS[dir_index]
return final_dir
def latitude_string(self):
"""
Create a readable string of the current latitude data
:return: string
"""
if self.coord_format == 'dd':
formatted_latitude = self.latitude
lat_string = str(formatted_latitude[0]) + '° ' + str(self._latitude[2])
elif self.coord_format == 'dms':
formatted_latitude = self.latitude
lat_string = str(formatted_latitude[0]) + '° ' + str(formatted_latitude[1]) + "' " + str(formatted_latitude[2]) + '" ' + str(formatted_latitude[3])
else:
lat_string = str(self._latitude[0]) + '° ' + str(self._latitude[1]) + "' " + str(self._latitude[2])
return lat_string
def longitude_string(self):
"""
Create a readable string of the current longitude data
:return: string
"""
if self.coord_format == 'dd':
formatted_longitude = self.longitude
lon_string = str(formatted_longitude[0]) + '° ' + str(self._longitude[2])
elif self.coord_format == 'dms':
formatted_longitude = self.longitude
lon_string = str(formatted_longitude[0]) + '° ' + str(formatted_longitude[1]) + "' " + str(formatted_longitude[2]) + '" ' + str(formatted_longitude[3])
else:
lon_string = str(self._longitude[0]) + '° ' + str(self._longitude[1]) + "' " + str(self._longitude[2])
return lon_string
def speed_string(self, unit='kph'):
"""
Creates a readable string of the current speed data in one of three units
:param unit: string of 'kph','mph, or 'knot'
:return:
"""
if unit == 'mph':
speed_string = str(self.speed[1]) + ' mph'
elif unit == 'knot':
if self.speed[0] == 1:
unit_str = ' knot'
else:
unit_str = ' knots'
speed_string = str(self.speed[0]) + unit_str
else:
speed_string = str(self.speed[2]) + ' km/h'
return speed_string
def date_string(self, formatting='s_mdy', century='20'):
"""
Creates a readable string of the current date.
Can select between long format: Januray 1st, 2014
or two short formats:
11/01/2014 (MM/DD/YYYY)
01/11/2014 (DD/MM/YYYY)
:param formatting: string 's_mdy', 's_dmy', or 'long'
:param century: int delineating the century the GPS data is from (19 for 19XX, 20 for 20XX)
:return: date_string string with long or short format date
"""
# Long Format Januray 1st, 2014
if formatting == 'long':
# Retrieve Month string from private set
month = self.__MONTHS[self.date[1] - 1]
# Determine Date Suffix
if self.date[0] in (1, 21, 31):
suffix = 'st'
elif self.date[0] in (2, 22):
suffix = 'nd'
elif self.date[0] == (3, 23):
suffix = 'rd'
else:
suffix = 'th'
day = str(self.date[0]) + suffix # Create Day String
year = century + str(self.date[2]) # Create Year String
date_string = month + ' ' + day + ', ' + year # Put it all together
else:
# Add leading zeros to day string if necessary
if self.date[0] < 10:
day = '0' + str(self.date[0])
else:
day = str(self.date[0])
# Add leading zeros to month string if necessary
if self.date[1] < 10:
month = '0' + str(self.date[1])
else:
month = str(self.date[1])
# Add leading zeros to year string if necessary
if self.date[2] < 10:
year = '0' + str(self.date[2])
else:
year = str(self.date[2])
# Build final string based on desired formatting
if formatting == 's_dmy':
date_string = day + '/' + month + '/' + year
else: # Default date format
date_string = month + '/' + day + '/' + year
return date_string
# All the currently supported NMEA sentences
supported_sentences = {'GPRMC': gprmc, 'GLRMC': gprmc,
'GPGGA': gpgga, 'GLGGA': gpgga,
'GPVTG': gpvtg, 'GLVTG': gpvtg,
'GPGSA': gpgsa, 'GLGSA': gpgsa,
'GPGSV': gpgsv, 'GLGSV': gpgsv,
'GPGLL': gpgll, 'GLGLL': gpgll,
'GNGGA': gpgga, 'GNRMC': gprmc,
'GNVTG': gpvtg, 'GNGLL': gpgll,
'GNGSA': gpgsa,
}
if __name__ == "__main__":
pass