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diff --git a/md/writeup/serial_gps_data_reading_utility.md b/md/writeup/serial_gps_data_reading_utility.md new file mode 100644 index 0000000..b3d233f --- /dev/null +++ b/md/writeup/serial_gps_data_reading_utility.md @@ -0,0 +1,88 @@ +title:Serial GPS data reading utility +keywords:gps,serial,uart,tty + +# Serial GPS data reading utility +Serial usb gps deviceses can be used trought serial consoles +or some other libraries. From shell need some basic configuaration +at begining to use serial device from shell. This command +provide simple way how to do it. +This code opens /dev/tty* device, setup baud rate to 4800 +and outputs line by line recieved data. +When device connected ther could be that is not in NMEA mode +it could be switched with: + +``` +gpsctl -n /dev/ttyUSB0 +``` + +Then you can connect with it with some serial terminal(dont forget baudrate +could be 4800 or 9600): + +``` +minicom -D /dev/ttyUSB0 +``` + +Now we can use our gpsr utility + +``` +./gpsr -d /dev/ttyUSB0 -c 0 +./gpsr -d /dev/ttyACM0 -c 1 +``` + +NMEA format is csv like and it easyly can be used from shell. Here is +exmple how it looks: + +``` +$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A +``` + +Where: +RMC Recommended Minimum sentence C +123519 Fix taken at 12:35:19 UTC +A Status A=active or V=Void. +4807.038,N Latitude 48 deg 07.038' N +01131.000,E Longitude 11 deg 31.000' E +022.4 Speed over the ground in knots +084.4 Track angle in degrees True +230394 Date - 23rd of March 1994 +003.1,W Magnetic Variation +*6A The checksum data, always begins with * + +Get time from GPS + +``` +./gpsr -d /dev/ttyUSB0 -c 100 | stdbuf -o0 grep -w "GPRMC" | cut -d',' -f2 +``` + +## REQUIREMENTS +GCC C, minicom, shell, GPS device + +## TESTED +I have tested everything with GPS devices BU-353 and with +some device that havenot any visual marks but have chip +from u-blox manufacturer. + +## COMPILE: + +``` +gcc buf.c -c +gcc serial_tty.c -c +gcc serial_tty.o buf.o gpsr.c -o gpsr +``` + +## TODO: +there could be added baudrate set as params +loging in csv,xml,json files +make longterm test for stability + + +## Links +http://en.wikipedia.org/wiki/NMEA_0183 +http://www.gpsinformation.org/dale/nmea.htm +http://home.mira.net/~gnb/gps/nmea.html +http://linux.die.net/man/1/minicom + +## Downloads +gpsr.tar.gz - 3KiB - +http://archive.main.lv/files/writeup/serial_gps_data_reading_utility/gpsr.tar.gz + |