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it's very simple to make code to interface a GPS receiver, since they use NMEA standard. But if you have this routines written in C code why don't you post them here?
actually I need to take $PGMRF but it´s not in the default strings that are transmited each 1 second. How to get it? I´ve tried with $PGRMO,PGRMF,1 CRLF that requests this string but it´s not working.
I´m omiting the checksum *hh is there any problem??
any help is welcome.
In the mean time we get the library, anyone could help me with this dam PPS signal??? I've already tried the $PGRMC,,,,,,,,,,,,2 command but it does not work... all the other PGRMC commands work fine... any ideas??? I'm using a garmin 35lvc type...
AAM - Waypoint arrival alarm
APA - Autopilot format A
APB - Autopilot format B (xte,steerto,arrivalcircle,arrivalperpendicular,
bearing (orig to dest), bearing (present to dest)
BOD - Bearing, origin to destination
BWC - Bearing and distance to waypoint, great circle
BWR - Bearing and distance to waypoint, rhumb line (overridden by BWC if available)
DBT - Depth below transducer
DPT - Depth of water
GGA - Global Positioning System Fix Data
GLL - Geographic position, latitude and longitude (and time)
GSA - GPS DOP and active satellites
GSV - Satellites in view
HDM - Heading, magnetic north
HDT - Heading, true north
HSC - Steer to heading
MTW - Mean water temperature
RMB - Recommended minimum navigation info when dest. waypoint is active
RMC - Recommended minimum specific GPS/Transit data
VTG - Track made good and ground speed
WCV - Waypoint closure velocity
WPL - Waypoint location
XTE - Cross-track error
XTR - Cross-track error, dead reckoning (overriden by XTE if available)
Recognized and supported proprietary sentences are:
PGRME - Garmin Proprietary Estimated Position Error
PGRMF - Garmin Proprietary Position Fix Sentence
PGRMM - Garmin Proprietary Map Datum Sentence
PGRMV - Garmin Proprietary Velocity Sentence
PGRMZ - Garmin Proprietary Altitude Information
PRWIZCH - Rockwell Zodiac Proprietary Channel Information
Let´s explain a little better, I need the PPS signal to be active to make a time base. In this equipment the time base is not for usig in a PC but in a 8051 ucontroller. I´ve bought a garmin gps35lvc gps but the PPS signal is not readly available from the corresponding pin. I´ve searched in the internet and found out that some gps do not have their PPS signal available from factory, this way a $PGRMC,,,,,,,,,,,,2<CR><LF> command must be sent to the module to enable the dam PPS pin. As long as the module receives a correct command it echoes back the same command. I´ve been using hyperterminal to access and send commands to the gps and it works well to baudrate select and all other commands, but the PPS is not working. I dont know whether the module is faulty or I´ve to send some more commands to enable the PPS.
Does anyone here have already worked on this gps using the PPS signal??? Any tip to enable this pin?? I´ve tried the garmin support but they simply dont repply my messages.
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