Hallo RN,
ich habe an meinem Raspberry einen GPS Sensor angebaut. Diesen habe ich so eingestellt das er alle 10 Sekunden ein NEMA Daten satz mit 9600 bps überträgt.
Nun habe ich das Problem das mein Raspberry die Daten Verpennt und nicht auswertet. Ich hatte den GPS Empfänger voher auf 1sec gestellt da lief es wunder bar. Ich habe auch überprüft ob es am GPS Empfänger liegt.
Aber er überträgt die Daten 100% richtig. Was kann ich ändern? Hier mein Script.
Code:#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import math
import serial
# Important definitions:
PORT = "/dev/ttyAMA0"
BAUD_RATE = 9600
LOG_FILE = "gpsdaten.txt"
def read_nmea_record(ser):
"""Read a NMEA 0183 record from a serial connection."""
cr = False
lf = False
record = '$'
while ser.read() != b'$':
pass
while not (cr and lf):
byte = ser.read()
if byte == b'\r':
cr = True
elif byte == b'\n':
lf = True
record = record + chr(ord(byte))
return record
def get_gps_data(ser):
"""Get actual GPS data as a dictionary."""
try:
record = ""
while True:
record = read_nmea_record(ser)
print(record)
fobj_out = open("/home/pi/uart_log.txt","a")
fobj_out.write(record)
fobj_out.close()
if record.startswith('$GPGGA'):
break
tokens = record[7:-5].split(',')
data = {}
data['record_length'] = len(record)-2
data['utc_time'] = tokens[0][0:2] + ":" + tokens[0][2:4] + ":" + tokens[0][4:6]
data['latitude'] = float(tokens[1][0:2]) + float(tokens[1][2:]) / 60
if tokens[2] == 'S':
data['latitude_numeric'] = -data['latitude']
else:
data['latitude_numeric'] = data['latitude']
data['latitude'] = "%.3f" % data['latitude'] + " " + tokens[2];
data['longitude'] = float(tokens[3][0:3]) + float(tokens[3][3:]) / 60
if tokens[4] == 'W':
data['longitude_numeric'] = -data['longitude']
else:
data['longitude_numeric'] = data['longitude']
data['longitude'] = "%.3f" % data['longitude'] + " " + tokens[4];
data['gps_quality'] = int(tokens[5])
data['satellite_count'] = int(tokens[6])
data['horizontal_dilution'] = float(tokens[7])
data['altitude'] = float(tokens[8])
data['geoidal_separation'] = float(tokens[10])
return data
except:
return None
def print_header():
"""Print the program header to stdout."""
print("")
print("|---------------------------------------------------------------------|")
print("|---------------------------------------------------------------------|")
print("| *****************************GPS*******************************|")
print("|---------------------------------------------------------------------|")
print("|---------------------------------------------------------------------|")
def print_gps_data(data):
"""Print the GPS data to stdout"""
print("Laenge des Datensatzes:", data['record_length'], "Zeichen")
print("Uhrzeit:", data['utc_time'])
print("Breitengrad:", data['latitude'])
print("Laengengrad:", data['longitude'])
print("Hoehe ueber dem Meeresspiegel:", data['altitude'])
print("GPS-Qualitaet:", data['gps_quality'])
def log_gps_data(data):
"""Append the GPS data to the log file."""
log = open(LOG_FILE,"a+")
log.write("___________________________________\n")
log.write("Breitengrad: " + str(data['latitude']) + "\n")
log.write("Laengengrad: " + str(data['longitude']) + "\n")
log.write("Höhe: " + str(data['altitude']) + "\n")
log.write("Zeit: " + str(data['utc_time']) + "\n")
log.write("Satelliten: " + "%.3f" % data['satellite_count'] + "\n")
log.write("Qualitaet: " + str(data['gps_quality']) + "\n")
log.close();
# UART oeffnen
uart = serial.Serial(PORT, BAUD_RATE)
print_header()
while True:
data = get_gps_data(uart)
if data:
print_gps_data(data)
log_gps_data(data)
Zitat:
14:47:54 $GPRMC,144754.00,A,5200.23778,N,01142.97998,E,1.06 2,227.70,190114,,,A*6E
14:47:54 $GPVTG,227.70,T,,M,1.062,N,1.967,K,A*31
14:47:54 $GPGGA,144754.00,5200.23778,N,01142.97998,E,1,09,1 .29,81.2,M,44.6,M,,*6B
14:47:54 $GPGSA,A,3,09,13,02,10,04,08,07,16,23,,,,2.12,1.29 ,1.68*03
14:47:54 $GPGSV,3,1,12,02,37,266,36,04,24,211,30,05,28,303, ,07,66,161,27*71
14:47:54 $GPGSV,3,2,12,08,37,192,24,09,33,203,30,10,79,217, 32,13,57,071,08*74
14:47:54 $GPGSV,3,3,12,16,22,048,16,23,25,081,25,26,01,259, ,29,05,325,*7F
14:47:54 $GPGLL,5200.23778,N,01142.97998,E,144754.00,A,A*60
14:48:04 $GPRMC,144804.00,A,5200.23680,N,01142.97782,E,0.44 3,227.70,190114,,,A*61
14:48:04 $GPVTG,227.70,T,,M,0.443,N,0.821,K,A*35
14:48:04 $GPGGA,144804.00,5200.23680,N,01142.97782,E,1,07,1 .49,86.0,M,44.6,M,,*6F
14:48:04 $GPGSA,A,3,09,02,10,04,08,07,23,,,,,,2.36,1.49,1.8 3*03
14:48:04 $GPGSV,3,1,12,02,37,266,35,04,24,211,26,05,28,303, ,07,66,161,26*74
14:48:04 $GPGSV,3,2,12,08,37,192,28,09,33,203,31,10,79,217, 33,13,57,071,*70
14:48:04 $GPGSV,3,3,12,16,22,048,10,23,25,081,26,26,01,259, ,29,05,325,*7A
14:48:04 $GPGLL,5200.23680,N,01142.97782,E,144804.00,A,A*69
