SirfSwitchToNMEA

Reconfigures a SiRF receiver to use NMEA protocol

Examples 1

// Palm OS
       case SwitchProtocolButton:
        {
            GPSPROTOCOL gpProtocol = GpsGetProtocol();
            switch (gpProtocol)
            {


                case GPSPROTOCOL_SIRF:

                    {
                        // Switch Protocol
                        SirfSwitchToNMEA(1, 1, 1, 3, 1, 1, 4800);

                        // Force message checking
                        GpsCheckForData(NULL, NULL);

                        // Wait 3 secs. for command processing
                        SysTaskDelay(SysTicksPerSecond() * 3);
                        GpsSetBaudRate(4800);
                        GpsSetProtocol(GPSPROTOCOL_NMEA);
                    }
                    break;
            }

        }

Examples 2

// Windows based platforms
       case SwitchProtocolButton:
        {
            GPSPROTOCOL gpProtocol = GpsGetProtocol();
            switch (gpProtocol)
            {


                case GPSPROTOCOL_SIRF:

                    {
                        // Switch Protocol
                        SirfSwitchToNMEA(1, 1, 1, 3, 1, 1, 4800);

                        // Wait 3 secs. for command processing
                        Sleep(3000);
                        GpsSetBaudRate(4800);
                        GpsSetProtocol(GPSPROTOCOL_NMEA);

                    }
                    break;
            }

        }

Parameters

Parameters	Description
long lGLL	Latitude, longitude, UTC time of position fix, and status
long lGSA	GPS receiver operating mode, satellites used in the position solution, and DOP values
long lGSV	Number of GPS satellites in view, satellite ID numbers, elevation, azimuth, and SNR values
long lRMC	Time, date, position, course, and speed data
long lVTG	Course and speed information relative to ground
unsigned short usBaudRate	Baud rate

Return Value

Returns GPSERROR_NONE on success or GPSERROR_CONFIG on failure.

Remarks

In Trickle Power mode, the update rate is specified by the user. When the receiver is switched to NMEA protocol, the message update rate is also required. The resulting update rate is the product of the Trickle Power update rate and the NMEA update rate (i.e. if the Trickle Power update rate is 2 seconds and the NMEA update rate is 5 seconds, the product update rate is 10 seconds).
CAUTION: GpsSetBaudRate MUST be used to change the baud rate on the host to match the baud rate on the receiver, otherwise communications could be lost.

See Example 1 for Palm OS or Example 2 for Windows based platforms.

Group

SiRF Specific functions

Declaration

GPSERROR GPSAPI SirfSwitchToNMEA(long lGGA, long lGLL, long lGSA, long lGSV, long lRMC, long lVTG, unsigned short usBaudRate);

File

sirfapi.h

Links

Examples 1, Examples 2, SiRF Specific functions