\n\nint main() {\nint rc;\nstruct timeval tv;\n\nstruct gps_data_t gps_data;\nif ((rc = gps_open(\"localhost\", \"2947\", &gps_data)) == -1) {\n printf(\"code: %d, reason: %s\\n\", rc, gps_errstr(rc));\n return EXIT_FAILURE;\n}\ngps_stream(&gps_data, WATCH_ENABLE | WATCH_JSON, NULL);",
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{
"title": "EZ-0048",
"rev_id": 10911,
"heading_path": "Example Code in C for Client",
"chunk_index": 12,
"content": "while (1) {\n \/* wait for 2 seconds to receive data *\/\n if (gps_waiting (&gps_data, 2000000)) {\n \/* read data *\/\n if ((rc = gps_read(&gps_data)) == -1) {\n printf(\"error occured reading gps data. code: %d, reason: %s\\n\", rc, gps_errstr(rc));\n } else {\n \/* Display data from the GPS receiver. *\/\n if ((gps_data.status == STATUS_FIX) &&\n (gps_data.fix.mode == MODE_2D || gps_data.fix.mode == MODE_3D) &&\n !isnan(gps_data.fix.latitude) &&\n !isnan(gps_data.fix.longitude)) {\n \/\/gettimeofday(&tv, NULL); EDIT: tv.tv_sec isn't actually the timestamp!\n printf(\"latitude: %f, longitude: %f, speed: %f, timestamp: %lf\\n\", gps_data.fix.latitude, gps_data.fix.longitude, gps_data.fix.speed, gps_data.fix.time); \/\/EDIT: Replaced tv.tv_sec with gps_data.fix.time\n } else {\n printf(\"no GPS data available\\n\");\n }\n }\n }\n\nsleep(3);\n}\n\n\/* When you are done... *\/\ngps_stream(&gps_data, WATCH_DISABLE, NULL);\ngps_close (&gps_data);",
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{
"title": "EZ-0048",
"rev_id": 10911,
"heading_path": "Example Code in C for Client",
"chunk_index": 13,
"content": "return EXIT_SUCCESS;\n}\n<\/pre>\n- Complie and run it.\n\ngcc -o gps gps.c -lm -lgps\nsudo .\/gps\n<\/pre>",
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{
"title": "EZ-0048",
"rev_id": 10911,
"heading_path": "Addictional solution for GPS client",
"chunk_index": 14,
"content": "- Using python with a GPS receiver on a Raspberry Pi\n- Comment\nHere are three examples of how to use python to get GPS data from a GPS receiver attached to a Raspberry Pi.\n\n\nUsing GPSD client libraries\nManually parsing NMEA sentences\nUsing pynmea2 to parse NMEA sentences\nGPSD client libraries\n<\/pre>\nThe gpsd client libraries are based on JSON. The JSON objects have a \"class\" attribute (E.g. TPV, SKY, DEVICE.etc...) which can be used to filter on different information.\n\nRefer to: [ http:\/\/www.catb.org\/gpsd\/gpsd_json.html | gpsd_json ]\n\n- This guide shows how to get gpsd up an running on a Raspberry Pi.\n- The example python script below filters on the TPV class, which is the Time Position Velocity report and then prints out the relevant information.\n\n#! \/usr\/bin\/python\nfrom gps import *\nimport time\n\ngpsd = gps(mode=WATCH_ENABLE|WATCH_NEWSTYLE)\nprint 'latitude\\tlongitude\\ttime utc\\t\\t\\taltitude\\tepv\\tept\\tspeed\\tclimb' # '\\t' = TAB to try and output the data in columns.",
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{
"title": "EZ-0048",
"rev_id": 10911,
"heading_path": "Addictional solution for GPS client",
"chunk_index": 15,
"content": "try:\n while True:\n report = gpsd.next() #\n\t if report['class'] == 'TPV':\n print getattr(report,'lat',0.0),\"\\t\",\n print getattr(report,'lon',0.0),\"\\t\",\n print getattr(report,'time',''),\"\\t\",\n print getattr(report,'alt','nan'),\"\\t\\t\",\n print getattr(report,'epv','nan'),\"\\t\",\n print getattr(report,'ept','nan'),\"\\t\",\n print getattr(report,'speed','nan'),\"\\t\",\n print getattr(report,'climb','nan'),\"\\t\"\n time.sleep(1)\nexcept (KeyboardInterrupt, SystemExit): #when you press ctrl+c\n print \"Done.\\nExiting.\"\n<\/pre>\n- This python script filters on the SKY class and prints out satellite information.\n\n#! \/usr\/bin\/python\n\nfrom gps import *\nimport time\nimport os\n\ngpsd = gps(mode=WATCH_ENABLE|WATCH_NEWSTYLE)\n\ntry:\n while True:\n report = gpsd.next() #\n if report['class'] == 'SKY':\n os.system('clear')\n print ' Satellites (total of', len(gpsd.satellites) , ' in view)'\n\t\tfor i in gpsd.satellites:\n print 't', i",
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},
{
"title": "EZ-0048",
"rev_id": 10911,
"heading_path": "Addictional solution for GPS client",
"chunk_index": 16,
"content": "print '\\n\\n'\n\t\tprint 'PRN = PRN ID of the satellite. 1-63 are GNSS satellites, 64-96 are GLONASS satellites, 100-164 are SBAS satellites'\n\t\tprint 'E = Elevation in degrees'\n\t\tprint 'As = Azimuth, degrees from true north'\n\t\tprint 'ss = Signal stength in dB'\n\t\tprint 'used = Used in current solution?'\n\ntime.sleep(1)\nexcept (KeyboardInterrupt, SystemExit): #when you press ctrl+c\n print \"Done.\\nExiting.\"\n<\/pre>\n- BerryGPS Raspberry Pi GPS\n- Manually parsing NMEA sentences\nThe python script below shows how to access GPS data by connecting directly to the serial interface.\n\nIt filters on $GPRMC NMEA sentences and then splits the well know attributes into different variables.\n\n\nimport serial\nport = \"\/dev\/serial0\"",
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{
"title": "EZ-0048",
"rev_id": 10911,
"heading_path": "Addictional solution for GPS client",
"chunk_index": 17,
"content": "def parseGPS(data):\n #print \"raw:\", data #prints raw data\n if data[0:6] == \"$GPRMC\":\n sdata = data.split(\",\")\n if sdata[2] == 'V':\n print \"no satellite data available\"\n return\n print \"---Parsing GPRMC---\",\n time = sdata[1][0:2] + \":\" + sdata[1][2:4] + \":\" + sdata[1][4:6]\n lat = decode(sdata[3]) #latitude\n dirLat = sdata[4] #latitude direction N\/S\n lon = decode(sdata[5]) #longitute\n dirLon = sdata[6] #longitude direction E\/W\n speed = sdata[7] #Speed in knots\n trCourse = sdata[8] #True course\n date = sdata[9][0:2] + \"\/\" + sdata[9][2:4] + \"\/\" + sdata[9][4:6]#date\n\nprint \"time : %s, latitude : %s(%s), longitude : %s(%s), speed : %s, True Course : %s, Date : %s\" % (time,lat,dirLat,lon,dirLon,speed,trCourse,date)\n\ndef decode(coord):\n #Converts DDDMM.MMMMM > DD deg MM.MMMMM min\n x = coord.split(\".\")\n head = x[0]\n tail = x[1]\n deg = head[0:-2]\n min = head[-2:]\n return deg + \" deg \" + min + \".\" + tail + \" min\"",
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},
{
"title": "EZ-0048",
"rev_id": 10911,
"heading_path": "Addictional solution for GPS client",
"chunk_index": 18,
"content": "print \"Receiving GPS data\"\nser = serial.Serial(port, baudrate = 9600, timeout = 0.5)\nwhile True:\n data = ser.readline()\n parseGPS(data)\n<\/pre>\n\n- Using pynmea2 to parse NMEA sentences\nThe python script below shows how to access GPS data by connecting directly to the serial interface.\n\nIt filters on $GPGGA NMEA sentences and then uses pynmea2 to parse the data.\n\nPynmea2 can be installed with:\n\n pi@raspberrypi ~ $ pip install pynmea2 <\/code><\/pre>\n\nimport serial\nimport pynmea2\n\nport = \"\/dev\/serial0\"\n\ndef parseGPS(str):\n if str.find('GGA') > 0:\n msg = pynmea2.parse(str)\n print \"Timestamp: %s -- Lat: %s %s -- Lon: %s %s -- Altitude: %s %s -- Satellites: %s\" % (msg.timestamp,msg.lat,msg.lat_dir,msg.lon,msg.lon_dir,msg.altitude,msg.altitude_units,msg.num_sats)\n\nserialPort = serial.Serial(port, baudrate = 9600, timeout = 0.5)\nwhile True:\n str = serialPort.readline()\n parseGPS(str)\n<\/pre>",
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{
"title": "EZ-0048",
"rev_id": 10911,
"heading_path": "Trouble Shooting",
"chunk_index": 19,
"content": "If you can not get the information mentioned before.\nYou can use this command to check if serial is working properly.\n\ncat \/dev\/ttyUSB0\n<\/code>\nit works fine if you see this picture:\n[left|600px](\/docs\/File:Usboutput.png)\n
\n----",
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{
"title": "EZ-0048",
"rev_id": 10911,
"heading_path": "FAQ",
"chunk_index": 20,
"content": "*Question: I use L80-R GPS module. I choose to connect the GPS to the raspberry using a USB port. I followed these steps:\n\npi@raspberrypi ~ $ sudo cat \/dev\/ttyUSB0\n$GPRMC,144034.00,V,,,,,,,090315,,,N*75\n$GPVTG,,,,,,,,,N*30\n$GPGGA,144034.00,,,,,0,00,99.99,,,,,,*60\n$GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*30\n$GPGSV,1,1,01,15,,,25*7B\n\nsudo apt-get update\nsudo apt-get install gpsd gpsd-clients\nsudo dpkg-reconfigure gpsd\nstart gpsd automatically: yes\nShould gpsd handle attached USB receivers automatically: yes\nDevice the GPS receiver is attached to: \nOptions to gpsd: -n \/dev\/ttyUSB0\ngpsd control socket path: