Posted on February 10, 2014 at 16:22//****************************************************************************
void Parse_GPS( void )
{
uint8_t c;
c = USART_ReceiveData(USART3); // read character
if ( c == '$' ) ucCommas = 0; // start of NMEA sentence
if ( c == ',' ) ucCommas++; // count commas
if (( ucCommas == 2 ) ||
( ucCommas == 3 )) { // get latitude data (3rd comma)
Parse_Coord (&fLat_Temp, c);
}
if (( ucCommas == 4 ) ||
( ucCommas == 5 )) { // get longitude data (5th comma)
Parse_Coord (&fLon_Temp, c);
}
if (( ucCommas == 9 ) ||
( ucCommas == 10 )) { // get heading (9th comma)
if ( c == ',' ) {
uiGps_Heading = 0;
} else if ( c != '.' ) {
uiGps_Heading *= 10;
uiGps_Heading += (c - '0');
}
}
if (ucCommas == 14){ // end of NMEA sentence
ucCommas = 14;
uiGps_Heading /= 10;
fLat_Curr = fLat_Temp;
fLon_Curr = fLon_Temp;
}
}
//****************************************************************************
static void Parse_Coord( float * fCoord, uint8_t c )
{
switch (c) {
case '0' :
case '1' :
case '2' :
case '3' :
case '4' :
case '5' :
case '6' :
case '7' :
case '8' :
case '9' :
ulTempCoord = ulTempCoord * 10UL + (uint32_t)(c - '0');
break;
case '.' :
*fCoord = (float)(ulTempCoord % 100UL) / 60.0f; // decimal part
*fCoord += (float)(ulTempCoord / 100UL); // integer part
ulTempCoord = 0UL;
break;
case ',' :
*fCoord += (float)ulTempCoord / 600000.0f; // decimal part
ulTempCoord = 0UL;
break;
default :
ulTempCoord = 0UL;
break;
}
}
//****************************************************************************
Clive1, I added this code for parse gps data. I want to parse just $GPGGA sentence. I got 0 as result. I printed fLon_Curr and fLat_Curr. What did I wrong? Can you help me please...I really need help because I am an amateur at coding :( Please help
