| 25 | ] |
| 26 | |
| 27 | class GROVEGPS(): |
| 28 | def __init__(self,port='/dev/ttyAMA0',baud=9600,timeout=0): |
| 29 | self.ser = serial.Serial(port,baud,timeout=timeout) |
| 30 | self.ser.flush() |
| 31 | self.raw_line = "" |
| 32 | self.gga = [] |
| 33 | self.validation =[] # contains compiled regex |
| 34 | |
| 35 | # compile regex once to use later |
| 36 | for i in range(len(patterns)-1): |
| 37 | self.validation.append(re.compile(patterns[i])) |
| 38 | |
| 39 | self.clean_data() |
| 40 | # self.get_date() # attempt to gete date from GPS. |
| 41 | |
| 42 | def clean_data(self): |
| 43 | ''' |
| 44 | clean_data: |
| 45 | ensures that all relevant GPS data is set to either empty string |
| 46 | or -1.0, or -1, depending on appropriate type |
| 47 | This occurs right after initialisation or |
| 48 | after 50 attemps to reach GPS |
| 49 | ''' |
| 50 | self.timestamp = "" |
| 51 | self.lat = -1.0 # degrees minutes and decimals of minute |
| 52 | self.NS = "" |
| 53 | self.lon = -1.0 |
| 54 | self.EW = "" |
| 55 | self.quality = -1 |
| 56 | self.satellites = -1 |
| 57 | self.altitude = -1.0 |
| 58 | |
| 59 | self.latitude = -1.0 #degrees and decimals |
| 60 | self.longitude = -1.0 |
| 61 | self.fancylat = "" # |
| 62 | |
| 63 | def get_date(self): |
| 64 | ''' |
| 65 | attempt to get date from GPS data. So far no luck. GPS does |
| 66 | not seem to send date sentence at all |
| 67 | function is unfinished |
| 68 | ''' |
| 69 | valid = False |
| 70 | for i in range(50): |
| 71 | time.sleep(0.5) |
| 72 | print (i) |
| 73 | self.raw_line = self.ser.readline().strip() |
| 74 | if self.raw_line[:6] == "GPZDA": # found date line! |
| 75 | print ("") |
| 76 | print (self.raw_line) |
| 77 | |
| 78 | |
| 79 | def read(self): |
| 80 | ''' |
| 81 | Attempts 50 times at most to get valid data from GPS |
| 82 | Returns as soon as valid data is found |
| 83 | If valid data is not found, then clean up data in GPS instance |
| 84 | ''' |