seniordesign-firmware Changeset - 2c211b2f6366

Changeset - 2c211b2f6366

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mkanning@CL-SEC241-10.cedarville.edu - 12 years ago 2012-11-15 15:42:15
mkanning@CL-SEC241-10.cedarville.edu

updates to gpsMKa.c for GPS parsing

2 files changed with 111 insertions and 12 deletions:

master/master/lib/trackuinoGPS/gpsMKa.c

111

master/master/lib/trackuinoGPS/gpsMKa.h

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master/master/lib/trackuinoGPS/gpsMKa.c

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@@ @@ -5,9 +5,8 @@ @@
  *  Author: mkanning
  */
 #include <stdbool.h>
 // has the transmission started
 bool transmissionBegin = false;
 #include <avr/io.h>
 #include "gpsMKa.h"
 // holds the byte ALREADY PARSED. includes starting character
 int bytesReceived = 0;
@@ @@ -15,32 +14,135 @@ int bytesReceived = 0; @@
 //data (and checksum) of most recent transmission
 char data[16];
 //used to skip over bytes during parse
 int skipBytes = 0;
 //variables to store data from transmission
 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 numSatellites;
 uint8_t hdop;
 uint8_t altitude;
 uint8_t wgs84Height;
 uint8_t lastUpdated;
 uint8_t stationID;
 uint8_t checksum;
 // transmission state machine
 enum decodeState {
 	INITIALIZE=0,
 	GET_TYPE,
 	GGA_TIME,
 	GGA_LATITUDE,
 	GGA_LONGITUDE,
 	GGA_QUALITY,
 	GGA_SATELLITES,
 	GGA_HDOP,
 	GGA_ALTITUDE,
 	GGA_WGS84,
 	GGA_LAST_UPDATE,
 	GGA_STATION_ID,
 	RMC_TIME
 }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
+	{
 		transmissionBegin = true;
 		bytesReceived = 1; //resets transmission if '$' is found
 		decodeState = GET_TYPE;
+	}
 	if (transmissionBegin)
 	//parse transmission type
 	else if (decodeState == GET_TYPE)
+	{
-		if (bytesReceived == 3) //check 4th byte
+		if (bytesReceived == 4 ) //check 4th byte
+		{
 			if(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;
+		}
 		//use a state machine implementation rather than this
+		}
+	}
 	//parse GGA timestamp
 	else if (decodeState == GGA_TIME)
+	{
 		if (byte = ',')//end of timestamp data
+		{
 			decodeState = GGA_LATITUDE;
 			skipBytes = 0; //prep for next phase of parse
+		}
 		else //store the byte of timestamp data
+		{
 			timestamp[bytesReceived-7] = byte; //adjust number of bytes to fit array
+		}
+	}
 	//parse GGA latitude data
 	else if (decodeState == GGA_LATITUDE)
+	{
 		if (byte == ',' && skipBytes == 0) //discard this byte
+		{
 			skipBytes = 1;
+		}
 		else if (byte == ',') //end of latitude data
+		{
 			decodeState = GGA_LONGITUDE;
 			skipBytes = 0; //prep for next phase of parse
+		}
 		else
+		{
 			latitude[bytesReceived-17] = byte; //adjust number of bytes to fit array
+		}
+	}
 	//parse GGA longitude data
 	else if (decodeState == GGA_LONGITUDE)
+	{
 		if (byte == ',' && skipBytes == 0) //discard this byte
+		{
 			skipBytes = 1;
+		}
 		else if (byte == ',') //end of latitude data
+		{
 			decodeState = GGA_QUALITY;
+		}
 		else
+		{
 			longitude[bytesReceived-17] = byte; //adjust number of bytes to fit array
+		}
+	}
 	//parse GGA quality data
 	else if (decodeState = GGA_QUALITY)
+	{
 		quality = byte;
+	}
+}

master/master/lib/trackuinoGPS/gpsMKa.h

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@@ @@ -11,8 +11,5 @@ @@
 #define GGA_MESSAGE
 #define RMC_MESSAGE
 #define UKN_MESSAGE
 // states
 #define
 #endif /* GPSMKA_H_ */
@@ \ No newline at end of file @@

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