seniordesign-firmware Changeset - ac84ccb03606

Changeset - ac84ccb03606

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mkanning@CL-SEC241-10.cedarville.edu - 13 years ago 2012-11-20 11:53:40
mkanning@CL-SEC241-10.cedarville.edu

More updates to GPS parser

1 file changed with 16 insertions and 5 deletions:

master/master/lib/trackuinoGPS/gpsMKa.c

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master/master/lib/trackuinoGPS/gpsMKa.c

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 /*
 * gpsMKa.c
+*
 * Created: 11/15/2012 12:02:38 PM
 *  Author: mkanning
 */
 #include <stdbool.h>
 #include <avr/io.h>
 #include "gpsMKa.h"
 // holds the byte ALREADY PARSED. includes starting character
 int bytesReceived = 0;
 //data (and checksum) of most recent transmission
 char data[16];
 //used to skip over bytes during parse
 int skipBytes = 0;
 //used to index data arrays during data collection
 int numBytes = 0;
 //variables to store data from transmission
 //least significant digit is stored at location 0 of arrays
 uint8_t tramsmissionType;
 uint8_t timestamp[9];	//hhmmss.ss
 uint8_t latitude[8];	//llll.ll,a
 uint8_t longitude[8];	//yyyyy.yy,a
 uint8_t quality;
 uint8_t latitude[8];	//lllll.lla
 uint8_t longitude[8];	//yyyyy.yya
 uint8_t quality;		//quality for GGA and validity for RMC
 uint8_t numSatellites[2];
 uint8_t hdop[4];		//xx.x
 uint8_t altitude[8];	//xxxxxx.x
 uint8_t wgs84Height[6];	//sxxx.x
 uint8_t lastUpdated[6];	//blank - included for testing
 uint8_t stationID[6];	//blank - included for testing
 uint8_t checksum;		//xx
 // transmission state machine
 enum decodeState {
 	//shared fields
 	INITIALIZE=0,
 	GET_TYPE,
 	GPS_CHECKSUM,	//need to find out how this is calculated/compared
 	//GGA data fields
 	GGA_TIME,
 	GGA_LATITUDE,
 	GGA_LONGITUDE,
 	GGA_QUALITY,
 	GGA_SATELLITES,
 	GGA_HDOP,
 	GGA_ALTITUDE,
 	GGA_WGS84,
 	GGA_LAST_UPDATE,
 	GGA_STATION_ID,
 	GGA_CHECKSUM,
 	RMC_TIME
 	//RMC data fields
 	RMC_TIME,
 	RMC_WARNING,
 	RMC_LATITUDE,
 	RMC_LONGITUDE,
 	RMC_KNOTS,
 	RMC_COURSE,
 	RMC_DATE,
 	RMC_MAG_VERIATION,
 }decodeState;
 /// MKa GPS transmission parser START
 void parse_gps_transmission(void){
 	bytesReceived++;
 	// Pull byte off of the buffer
 	char byte = uart_getchar();
 	// $--GGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx
 	//        ^8        ^18       ^28
 	if(byte == '$') //start of transmission sentence
+	{
 		bytesReceived = 1; //resets transmission if '$' is found
 		decodeState = GET_TYPE;
 		numBytes = 0;
+	}
 	//parse transmission type
 	else if (decodeState == GET_TYPE)
+	{
 		if (bytesReceived == 4 ) //check 4th byte
+		{
 			tramsmissionType = byte;
+		}
 		if(byte = ',') //end of type data
+		{
 			if (tramsmissionType == 'G')
+			{
 				decodeState = GGA_TIME;
+			}
 			else if(tramsmissionType == 'R')
+			{
 				decodeState = RMC_TIME; //not implemented
+			}
 			else
+			{
 				//reset
 				decodeState = INITIALIZE;
 				bytesReceived = 0;
+			}
+		}
+	}
 	//parse GGA timestamp
 	else if (decodeState == GGA_TIME)
+	{

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