Clayton G / Mbed 2 deprecated QRSS_Rx

QRSS Rx Network receiver. A receiver to sample a segment of RF spectrum and send this data to a server for further processing and display. NXP mbed Design Challenge entry (Honorable Mention). Published in Circuit Cellar, Feb 2012

Dependencies:   NetServices mbed DNSResolver

gps.cpp@0:82ff15078322, 2012-01-25 (annotated)

Committer:
claytong
Date:
Wed Jan 25 20:32:53 2012 +0000
Revision:
0:82ff15078322
1.0 (initial public release)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
claytong 0:82ff15078322 1 /*---------------------------------------------------------------------------
claytong 0:82ff15078322 2
claytong 0:82ff15078322 3 QRSS Receiver Application
claytong 0:82ff15078322 4
claytong 0:82ff15078322 5 by Clayton ZL3TKA/VK1TKA
claytong 0:82ff15078322 6 clayton@isnotcrazy.com
claytong 0:82ff15078322 7
claytong 0:82ff15078322 8 GPS Module
claytong 0:82ff15078322 9
claytong 0:82ff15078322 10 ---------------------------------------------------------------------------*/
claytong 0:82ff15078322 11 // include files
claytong 0:82ff15078322 12
claytong 0:82ff15078322 13 #include "gps.h"
claytong 0:82ff15078322 14 #include "comms.h"
claytong 0:82ff15078322 15
claytong 0:82ff15078322 16 // Definitions
claytong 0:82ff15078322 17
claytong 0:82ff15078322 18 #define GPS_DEBUG 0
claytong 0:82ff15078322 19
claytong 0:82ff15078322 20 // comments
claytong 0:82ff15078322 21
claytong 0:82ff15078322 22 // Macros
claytong 0:82ff15078322 23
claytong 0:82ff15078322 24 // Local Data
claytong 0:82ff15078322 25
claytong 0:82ff15078322 26 // Global Data
claytong 0:82ff15078322 27 TGPSController GPSModule;
claytong 0:82ff15078322 28
claytong 0:82ff15078322 29
claytong 0:82ff15078322 30 // Function Prototypes
claytong 0:82ff15078322 31
claytong 0:82ff15078322 32 //---------------------------------------------------------------------------
claytong 0:82ff15078322 33 // TGPSController Class Methods
claytong 0:82ff15078322 34 //---------------------------------------------------------------------------
claytong 0:82ff15078322 35
claytong 0:82ff15078322 36 //---------------------------------------------------------------------------
claytong 0:82ff15078322 37 //
claytong 0:82ff15078322 38 // Constructor
claytong 0:82ff15078322 39 //
claytong 0:82ff15078322 40 TGPSController::TGPSController() :
claytong 0:82ff15078322 41 PPSInput( p30 ),
claytong 0:82ff15078322 42 GPSPort( p28, p27 ),
claytong 0:82ff15078322 43 GPSUpLED( LED3 ),
claytong 0:82ff15078322 44 PPSEvent( p30 ),
claytong 0:82ff15078322 45 bPulsed( false ),
claytong 0:82ff15078322 46 uiPPSCapture( 0 ),
claytong 0:82ff15078322 47 uiLOscCapture( 0 )
claytong 0:82ff15078322 48 {
claytong 0:82ff15078322 49 // clear current and last line
claytong 0:82ff15078322 50 szCurrentLine[0] = 0;
claytong 0:82ff15078322 51 szLastLine[0] = 0;
claytong 0:82ff15078322 52 bNewLine = false;
claytong 0:82ff15078322 53 }
claytong 0:82ff15078322 54
claytong 0:82ff15078322 55 //---------------------------------------------------------------------------
claytong 0:82ff15078322 56 //
claytong 0:82ff15078322 57 // Initialise routine
claytong 0:82ff15078322 58 //
claytong 0:82ff15078322 59 void TGPSController::Init()
claytong 0:82ff15078322 60 {
claytong 0:82ff15078322 61 // Set up GPS port
claytong 0:82ff15078322 62 GPSPort.baud( 4800 );
claytong 0:82ff15078322 63
claytong 0:82ff15078322 64 // capture 1PPS event
claytong 0:82ff15078322 65 PPSEvent.rise( this, &TGPSController::PPSPulse );
claytong 0:82ff15078322 66
claytong 0:82ff15078322 67 // Start timeout timer
claytong 0:82ff15078322 68 GPSMsgTimeout.start();
claytong 0:82ff15078322 69 GPSPulseTimeout.start();
claytong 0:82ff15078322 70
claytong 0:82ff15078322 71 // Set up timer hardware
claytong 0:82ff15078322 72 LPC_PINCON->PINSEL0 |= ( (0x3<<8) | (0x3<<10) ); // enable CAP2.0, CAP2.1
claytong 0:82ff15078322 73 LPC_SC->PCONP |= 1 << 22; // power up TIMER2 (PCONP[22])
claytong 0:82ff15078322 74 LPC_SC->PCLKSEL1 &= ~(0x3<<12);
claytong 0:82ff15078322 75 LPC_SC->PCLKSEL1 |= (0x1<<12); // Timer2 PCLK = CCLK
claytong 0:82ff15078322 76 LPC_TIM2->TCR = 0x2; // reset timer
claytong 0:82ff15078322 77 LPC_TIM2->CTCR = 0x0; // timer mode
claytong 0:82ff15078322 78 LPC_TIM2->PR = 0; // no prescale
claytong 0:82ff15078322 79 LPC_TIM2->MCR = 0x0; // no match
claytong 0:82ff15078322 80 LPC_TIM2->CCR = (1<<0) | (1<<3); // Capture rising edges on both CAP2.0 & CAP2.1
claytong 0:82ff15078322 81 LPC_TIM2->TCR = 1; // start the timer
claytong 0:82ff15078322 82 }
claytong 0:82ff15078322 83
claytong 0:82ff15078322 84 //---------------------------------------------------------------------------
claytong 0:82ff15078322 85 //
claytong 0:82ff15078322 86 // Poll routine
claytong 0:82ff15078322 87 //
claytong 0:82ff15078322 88 void TGPSController::Poll()
claytong 0:82ff15078322 89 {
claytong 0:82ff15078322 90 // Test for a 1PPS pulse
claytong 0:82ff15078322 91 if ( bPulsed )
claytong 0:82ff15078322 92 { // 1PPS from the GPS unit
claytong 0:82ff15078322 93 bPulsed = false;
claytong 0:82ff15078322 94 GPSPulseTimeout.reset();
claytong 0:82ff15078322 95
claytong 0:82ff15078322 96 // flush out any old serial data
claytong 0:82ff15078322 97 while ( GPSPort.readable() )
claytong 0:82ff15078322 98 GPSPort.getc();
claytong 0:82ff15078322 99 #if GPS_DEBUG>2
claytong 0:82ff15078322 100 printf( "***1PPS***\r\n" );
claytong 0:82ff15078322 101 #endif
claytong 0:82ff15078322 102 // Record capture data to comms module
claytong 0:82ff15078322 103 Comms.RecordPPSTimestamps( uiPPSCapture, uiLOscCapture, GPSRecord );
claytong 0:82ff15078322 104 }
claytong 0:82ff15078322 105
claytong 0:82ff15078322 106 // Test for GPS serial port data
claytong 0:82ff15078322 107 while ( GPSPort.readable() )
claytong 0:82ff15078322 108 {
claytong 0:82ff15078322 109 char cNextChar = GPSPort.getc();
claytong 0:82ff15078322 110 #if GPS_DEBUG>3
claytong 0:82ff15078322 111 printf( "%c", cNextChar );
claytong 0:82ff15078322 112 #endif
claytong 0:82ff15078322 113 if ( ParseData(cNextChar) )
claytong 0:82ff15078322 114 { // have a completed GPS sentence
claytong 0:82ff15078322 115 GPSMsgTimeout.reset();
claytong 0:82ff15078322 116 // analysis the sentence data
claytong 0:82ff15078322 117 int iStatus = ProcessGPSData();
claytong 0:82ff15078322 118 if ( iStatus==0 )
claytong 0:82ff15078322 119 { // good sentence
claytong 0:82ff15078322 120 #if GPS_DEBUG>0
claytong 0:82ff15078322 121 printf( "Time: %d\r\n", GPSRecord.iGPSTimeSeconds );
claytong 0:82ff15078322 122 printf( "Lat: %d\r\n", GPSRecord.iGPSLatMicroDegrees );
claytong 0:82ff15078322 123 printf( "Long: %d\r\n", GPSRecord.iGPSLongMicroDegrees );
claytong 0:82ff15078322 124 printf( "Alt: %d\r\n", GPSRecord.iGPSAltitudeMeters );
claytong 0:82ff15078322 125 printf( "Sats: %d\r\n", GPSRecord.iGPSSatellites );
claytong 0:82ff15078322 126 printf( "Qual: %d\r\n", GPSRecord.iGPSQuality );
claytong 0:82ff15078322 127 #endif
claytong 0:82ff15078322 128 }
claytong 0:82ff15078322 129 }
claytong 0:82ff15078322 130 }
claytong 0:82ff15078322 131
claytong 0:82ff15078322 132 // Test for GPS timeout (no data)
claytong 0:82ff15078322 133 if ( GPSMsgTimeout.read_ms()>GPS_MSGTIMEOUT )
claytong 0:82ff15078322 134 { // No GPS messages for a period
claytong 0:82ff15078322 135 #if GPS_DEBUG>1
claytong 0:82ff15078322 136 printf( "GPS Timeout - setting to offline\r\n" );
claytong 0:82ff15078322 137 #endif
claytong 0:82ff15078322 138 GPSRecord.iGPSQuality = 0; // set quality to 0 - invalid data
claytong 0:82ff15078322 139 GPSMsgTimeout.reset();
claytong 0:82ff15078322 140 // Record invalid GPS status to comms module
claytong 0:82ff15078322 141 Comms.RecordPPSTimestamps( 0, 0, GPSRecord );
claytong 0:82ff15078322 142 }
claytong 0:82ff15078322 143
claytong 0:82ff15078322 144 // Test for GPS timeout (no 1PPS)
claytong 0:82ff15078322 145 if ( GPSPulseTimeout.read_ms()>GPS_PULSETIMEOUT )
claytong 0:82ff15078322 146 { // No GPS pulse for a period
claytong 0:82ff15078322 147 // we just forward data to Comms module with invalid capture data
claytong 0:82ff15078322 148 Comms.RecordPPSTimestamps( 0, 0, GPSRecord );
claytong 0:82ff15078322 149 GPSPulseTimeout.reset();
claytong 0:82ff15078322 150 }
claytong 0:82ff15078322 151
claytong 0:82ff15078322 152 }
claytong 0:82ff15078322 153
claytong 0:82ff15078322 154 //---------------------------------------------------------------------------
claytong 0:82ff15078322 155 //
claytong 0:82ff15078322 156 // Parse data from the GPS
claytong 0:82ff15078322 157 // Return true if a completed valid sentence is received
claytong 0:82ff15078322 158 //
claytong 0:82ff15078322 159 #define EXPECT_CHAR(CC) if (cChr==CC)iParseState++; else iParseState=0;ResetNumber()
claytong 0:82ff15078322 160 #define PARSE_NUMBER(NN) if(cChr==','){NN=ParseNum;ResetNumber();iParseState++;break;}if (!ParseNumber(cChr))iParseState=0
claytong 0:82ff15078322 161 #define PARSE_CHARACTER(CH) if(cChr==','){CH=cCharacter;ResetNumber();iParseState++;break;}cCharacter=cChr
claytong 0:82ff15078322 162 //
claytong 0:82ff15078322 163 bool TGPSController::ParseData( char cChr )
claytong 0:82ff15078322 164 {
claytong 0:82ff15078322 165 ucChecksum ^= cChr;
claytong 0:82ff15078322 166 switch ( iParseState )
claytong 0:82ff15078322 167 {
claytong 0:82ff15078322 168 case 0:
claytong 0:82ff15078322 169 if ( cChr=='$' )
claytong 0:82ff15078322 170 iParseState++;
claytong 0:82ff15078322 171 ucChecksum = 0;
claytong 0:82ff15078322 172 break;
claytong 0:82ff15078322 173 case 1: EXPECT_CHAR('G'); break;
claytong 0:82ff15078322 174 case 2: EXPECT_CHAR('P'); break;
claytong 0:82ff15078322 175 case 3: EXPECT_CHAR('G'); break;
claytong 0:82ff15078322 176 case 4: EXPECT_CHAR('G'); break;
claytong 0:82ff15078322 177 case 5: EXPECT_CHAR('A'); break;
claytong 0:82ff15078322 178 case 6: EXPECT_CHAR(','); break;
claytong 0:82ff15078322 179 case 7: PARSE_NUMBER( GPSTime ); break;
claytong 0:82ff15078322 180 case 8: PARSE_NUMBER( GPSLatitude ); break;
claytong 0:82ff15078322 181 case 9: PARSE_CHARACTER( GPSLatNS ); break;
claytong 0:82ff15078322 182 case 10: PARSE_NUMBER( GPSLongitude ); break;
claytong 0:82ff15078322 183 case 11: PARSE_CHARACTER( GPSLongEW ); break;
claytong 0:82ff15078322 184 case 12: PARSE_NUMBER( GPSQuality ); break;
claytong 0:82ff15078322 185 case 13: PARSE_NUMBER( GPSSatellites ); break;
claytong 0:82ff15078322 186 case 14: PARSE_NUMBER( GPSDOP ); break;
claytong 0:82ff15078322 187 case 15: PARSE_NUMBER( GPSAltitude ); break;
claytong 0:82ff15078322 188 case 16: PARSE_CHARACTER( GPSAltType ); break;
claytong 0:82ff15078322 189 case 17: PARSE_NUMBER( GPSHeight ); break;
claytong 0:82ff15078322 190 case 18: PARSE_CHARACTER( GPSHeightType ); break;
claytong 0:82ff15078322 191 case 19: EXPECT_CHAR(',');
claytong 0:82ff15078322 192 ucFinalChecksum = ucChecksum;
claytong 0:82ff15078322 193 break;
claytong 0:82ff15078322 194 case 20: EXPECT_CHAR('*'); break;
claytong 0:82ff15078322 195 case 21: iParseState++;
claytong 0:82ff15078322 196 if ( (cChr>='0') && (cChr<='9') )
claytong 0:82ff15078322 197 ucMsgChecksum = (cChr-'0') << 4;
claytong 0:82ff15078322 198 else if ( (cChr>='A') && (cChr<='F') )
claytong 0:82ff15078322 199 ucMsgChecksum = (cChr-'A'+10) << 4;
claytong 0:82ff15078322 200 else
claytong 0:82ff15078322 201 iParseState = 0;
claytong 0:82ff15078322 202 break;
claytong 0:82ff15078322 203 case 22: iParseState++;
claytong 0:82ff15078322 204 if ( (cChr>='0') && (cChr<='9') )
claytong 0:82ff15078322 205 ucMsgChecksum |= (cChr-'0');
claytong 0:82ff15078322 206 else if ( (cChr>='A') && (cChr<='F') )
claytong 0:82ff15078322 207 ucMsgChecksum |= (cChr-'A'+10);
claytong 0:82ff15078322 208 else
claytong 0:82ff15078322 209 iParseState = 0;
claytong 0:82ff15078322 210 break;
claytong 0:82ff15078322 211 case 23: // don't care about char (should be a CR)
claytong 0:82ff15078322 212 // just check the results
claytong 0:82ff15078322 213 if ( ucMsgChecksum==ucFinalChecksum )
claytong 0:82ff15078322 214 { // Checksum okay
claytong 0:82ff15078322 215 // reset
claytong 0:82ff15078322 216 iParseState = 0;
claytong 0:82ff15078322 217 // return valid message
claytong 0:82ff15078322 218 return true;
claytong 0:82ff15078322 219 }
claytong 0:82ff15078322 220 #if GPS_DEBUG>0
claytong 0:82ff15078322 221 else
claytong 0:82ff15078322 222 printf( "!GPS Check failed - got %02X wanted %02X\r\n", (int)ucMsgChecksum, (int)ucFinalChecksum );
claytong 0:82ff15078322 223 #endif
claytong 0:82ff15078322 224 // reset
claytong 0:82ff15078322 225 iParseState = 0;
claytong 0:82ff15078322 226 break;
claytong 0:82ff15078322 227 }
claytong 0:82ff15078322 228
claytong 0:82ff15078322 229 #if GPS_DEBUG>2
claytong 0:82ff15078322 230 // report parser state
claytong 0:82ff15078322 231 printf( ":%d:", iParseState );
claytong 0:82ff15078322 232 #endif
claytong 0:82ff15078322 233
claytong 0:82ff15078322 234 // GPS sentence note yet completed
claytong 0:82ff15078322 235 return false;
claytong 0:82ff15078322 236 }
claytong 0:82ff15078322 237
claytong 0:82ff15078322 238 //---------------------------------------------------------------------------
claytong 0:82ff15078322 239 //
claytong 0:82ff15078322 240 // Parse a number character by character
claytong 0:82ff15078322 241 // If character is invalid, returns false
claytong 0:82ff15078322 242 //
claytong 0:82ff15078322 243 bool TGPSController::ParseNumber( char cChar )
claytong 0:82ff15078322 244 {
claytong 0:82ff15078322 245 // process digits
claytong 0:82ff15078322 246 if ( (cChar>='0') && (cChar<='9') )
claytong 0:82ff15078322 247 {
claytong 0:82ff15078322 248 ParseNum.uiNumber = (ParseNum.uiNumber*10) + (cChar-'0');
claytong 0:82ff15078322 249 ParseNum.iNumberLen++;
claytong 0:82ff15078322 250 if ( ParseNum.iNumberDecimals>=0 )
claytong 0:82ff15078322 251 ParseNum.iNumberDecimals++;
claytong 0:82ff15078322 252 return true;
claytong 0:82ff15078322 253 }
claytong 0:82ff15078322 254 if ( cChar=='.' )
claytong 0:82ff15078322 255 {
claytong 0:82ff15078322 256 if ( ParseNum.iNumberDecimals>=0 )
claytong 0:82ff15078322 257 return false; // a second decimal point!
claytong 0:82ff15078322 258 ParseNum.iNumberDecimals = 0;
claytong 0:82ff15078322 259 return true;
claytong 0:82ff15078322 260 }
claytong 0:82ff15078322 261 if ( cChar=='-' )
claytong 0:82ff15078322 262 {
claytong 0:82ff15078322 263 if ( ParseNum.iNumberLen>0 )
claytong 0:82ff15078322 264 return false; // '-' must be the first character
claytong 0:82ff15078322 265 ParseNum.iNumberSign = -1;
claytong 0:82ff15078322 266 return true;
claytong 0:82ff15078322 267 }
claytong 0:82ff15078322 268 // otherwise an invalid character
claytong 0:82ff15078322 269 return false;
claytong 0:82ff15078322 270 }
claytong 0:82ff15078322 271
claytong 0:82ff15078322 272 //---------------------------------------------------------------------------
claytong 0:82ff15078322 273 //
claytong 0:82ff15078322 274 // Reset the number parser
claytong 0:82ff15078322 275 //
claytong 0:82ff15078322 276 void TGPSController::ResetNumber( )
claytong 0:82ff15078322 277 {
claytong 0:82ff15078322 278 ParseNum.uiNumber = 0;
claytong 0:82ff15078322 279 ParseNum.iNumberLen = 0;
claytong 0:82ff15078322 280 ParseNum.iNumberSign = 1;
claytong 0:82ff15078322 281 ParseNum.iNumberDecimals = -1;
claytong 0:82ff15078322 282 cCharacter = 0;
claytong 0:82ff15078322 283 }
claytong 0:82ff15078322 284
claytong 0:82ff15078322 285
claytong 0:82ff15078322 286 //---------------------------------------------------------------------------
claytong 0:82ff15078322 287 //
claytong 0:82ff15078322 288 // Process the data from the GPS message
claytong 0:82ff15078322 289 // Returns 0 if all data is good, or an error code
claytong 0:82ff15078322 290 //
claytong 0:82ff15078322 291 int TGPSController::ProcessGPSData( )
claytong 0:82ff15078322 292 {
claytong 0:82ff15078322 293 // check Quality
claytong 0:82ff15078322 294 if ( GPSQuality.iNumberLen<1 ) return 10;
claytong 0:82ff15078322 295 if ( GPSQuality.iNumberDecimals!=-1 ) return 11;
claytong 0:82ff15078322 296 if ( GPSQuality.iNumberSign!=1 ) return 12;
claytong 0:82ff15078322 297 // check Satellites
claytong 0:82ff15078322 298 if ( GPSSatellites.iNumberLen<1 ) return 20;
claytong 0:82ff15078322 299 if ( GPSSatellites.iNumberDecimals!=-1 ) return 21;
claytong 0:82ff15078322 300 if ( GPSSatellites.iNumberSign!=1 ) return 22;
claytong 0:82ff15078322 301 // Store sats and quality parameters
claytong 0:82ff15078322 302 GPSRecord.iGPSSatellites = GPSSatellites.uiNumber;
claytong 0:82ff15078322 303 GPSRecord.iGPSQuality = GPSQuality.uiNumber;
claytong 0:82ff15078322 304 // Check quality level
claytong 0:82ff15078322 305 if ( GPSQuality.uiNumber<1 ) return 100; // no fix
claytong 0:82ff15078322 306 // check Time
claytong 0:82ff15078322 307 if ( GPSTime.iNumberLen<6 ) return 30;
claytong 0:82ff15078322 308 if ( GPSTime.iNumberSign!=1 ) return 32;
claytong 0:82ff15078322 309 // check Latitude
claytong 0:82ff15078322 310 if ( GPSLatitude.iNumberLen!=7 ) return 40;
claytong 0:82ff15078322 311 if ( GPSLatitude.iNumberDecimals!=3 ) return 41;
claytong 0:82ff15078322 312 if ( GPSLatitude.iNumberSign!=1 ) return 42;
claytong 0:82ff15078322 313 if ( (GPSLatNS!='N') && (GPSLatNS!='S') ) return 43;
claytong 0:82ff15078322 314 // check Longitude
claytong 0:82ff15078322 315 if ( GPSLongitude.iNumberLen!=8 ) return 50;
claytong 0:82ff15078322 316 if ( GPSLongitude.iNumberDecimals!=3 ) return 51;
claytong 0:82ff15078322 317 if ( GPSLongitude.iNumberSign!=1 ) return 52;
claytong 0:82ff15078322 318 if ( (GPSLongEW!='E') && (GPSLongEW!='W') ) return 53;
claytong 0:82ff15078322 319 // check Altitude
claytong 0:82ff15078322 320 if ( GPSAltitude.iNumberLen<1 ) return 60;
claytong 0:82ff15078322 321 // Don't care about DOPs and Height and Types
claytong 0:82ff15078322 322 // Translate & Store parameters
claytong 0:82ff15078322 323
claytong 0:82ff15078322 324 // discard fractions of seconds
claytong 0:82ff15078322 325 while ( (GPSTime.iNumberDecimals--)>0 )
claytong 0:82ff15078322 326 GPSTime.uiNumber /= 10;
claytong 0:82ff15078322 327
claytong 0:82ff15078322 328 int32_t iHours = GPSTime.uiNumber/10000;
claytong 0:82ff15078322 329 int32_t iMins = (GPSTime.uiNumber/100)%100;
claytong 0:82ff15078322 330 int32_t iSecs = GPSTime.uiNumber%100;
claytong 0:82ff15078322 331 GPSRecord.iGPSTimeSeconds = iSecs + (60*iMins) + (3600*iHours);
claytong 0:82ff15078322 332
claytong 0:82ff15078322 333 int32_t iDegrees = GPSLatitude.uiNumber / 100000;
claytong 0:82ff15078322 334 int32_t iMilliMinutes = GPSLatitude.uiNumber % 100000;
claytong 0:82ff15078322 335 GPSRecord.iGPSLatMicroDegrees = (iMilliMinutes * 100 / 6) + (iDegrees*1000000);
claytong 0:82ff15078322 336 if ( GPSLatNS=='S' )
claytong 0:82ff15078322 337 GPSRecord.iGPSLatMicroDegrees = -GPSRecord.iGPSLatMicroDegrees;
claytong 0:82ff15078322 338
claytong 0:82ff15078322 339 iDegrees = GPSLongitude.uiNumber / 100000;
claytong 0:82ff15078322 340 iMilliMinutes = GPSLongitude.uiNumber % 100000;
claytong 0:82ff15078322 341 GPSRecord.iGPSLongMicroDegrees = (iMilliMinutes * 100 / 6) + (iDegrees*1000000);
claytong 0:82ff15078322 342 if ( GPSLongEW=='W' )
claytong 0:82ff15078322 343 GPSRecord.iGPSLatMicroDegrees = -GPSRecord.iGPSLatMicroDegrees;
claytong 0:82ff15078322 344
claytong 0:82ff15078322 345 GPSRecord.iGPSAltitudeMeters = GPSAltitude.uiNumber * GPSAltitude.iNumberSign;
claytong 0:82ff15078322 346 while ( (GPSAltitude.iNumberDecimals--)>0 )
claytong 0:82ff15078322 347 GPSRecord.iGPSAltitudeMeters /= 10;
claytong 0:82ff15078322 348
claytong 0:82ff15078322 349 return 0;
claytong 0:82ff15078322 350 }
claytong 0:82ff15078322 351
claytong 0:82ff15078322 352 //---------------------------------------------------------------------------
claytong 0:82ff15078322 353 //
claytong 0:82ff15078322 354 // PPS Event routine
claytong 0:82ff15078322 355 //
claytong 0:82ff15078322 356 void TGPSController::PPSPulse()
claytong 0:82ff15078322 357 {
claytong 0:82ff15078322 358 // indicate we have pulsed
claytong 0:82ff15078322 359 bPulsed = true;
claytong 0:82ff15078322 360
claytong 0:82ff15078322 361 // capture timer capture registers
claytong 0:82ff15078322 362 // 1PPP = CAP2.0
claytong 0:82ff15078322 363 // LOsc (/4096) = CAP2.1
claytong 0:82ff15078322 364 uiPPSCapture = LPC_TIM2->CR0;
claytong 0:82ff15078322 365 uiLOscCapture = LPC_TIM2->CR1;
claytong 0:82ff15078322 366
claytong 0:82ff15078322 367 }
claytong 0:82ff15078322 368
claytong 0:82ff15078322 369 /*
claytong 0:82ff15078322 370 GPS Messages:
claytong 0:82ff15078322 371
claytong 0:82ff15078322 372 GGA - essential fix data which provide 3D location and accuracy data.
claytong 0:82ff15078322 373
claytong 0:82ff15078322 374 $GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47
claytong 0:82ff15078322 375
claytong 0:82ff15078322 376 Where:
claytong 0:82ff15078322 377 GGA Global Positioning System Fix Data
claytong 0:82ff15078322 378 123519 Fix taken at 12:35:19 UTC
claytong 0:82ff15078322 379 4807.038,N Latitude 48 deg 07.038' N
claytong 0:82ff15078322 380 01131.000,E Longitude 11 deg 31.000' E
claytong 0:82ff15078322 381 1 Fix quality: 0 = invalid
claytong 0:82ff15078322 382 1 = GPS fix (SPS)
claytong 0:82ff15078322 383 2 = DGPS fix
claytong 0:82ff15078322 384 3 = PPS fix
claytong 0:82ff15078322 385 4 = Real Time Kinematic
claytong 0:82ff15078322 386 5 = Float RTK
claytong 0:82ff15078322 387 6 = estimated (dead reckoning) (2.3 feature)
claytong 0:82ff15078322 388 7 = Manual input mode
claytong 0:82ff15078322 389 8 = Simulation mode
claytong 0:82ff15078322 390 08 Number of satellites being tracked
claytong 0:82ff15078322 391 0.9 Horizontal dilution of position
claytong 0:82ff15078322 392 545.4,M Altitude, Meters, above mean sea level
claytong 0:82ff15078322 393 46.9,M Height of geoid (mean sea level) above WGS84
claytong 0:82ff15078322 394 ellipsoid
claytong 0:82ff15078322 395 (empty field) time in seconds since last DGPS update
claytong 0:82ff15078322 396 (empty field) DGPS station ID number
claytong 0:82ff15078322 397 *47 the checksum data, always begins with *
claytong 0:82ff15078322 398
claytong 0:82ff15078322 399
claytong 0:82ff15078322 400 VTG - Velocity made good. The gps receiver may use the LC prefix instead of GP if it is emulating Loran output.
claytong 0:82ff15078322 401
claytong 0:82ff15078322 402 $GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*48
claytong 0:82ff15078322 403
claytong 0:82ff15078322 404 where:
claytong 0:82ff15078322 405 VTG Track made good and ground speed
claytong 0:82ff15078322 406 054.7,T True track made good (degrees)
claytong 0:82ff15078322 407 034.4,M Magnetic track made good
claytong 0:82ff15078322 408 005.5,N Ground speed, knots
claytong 0:82ff15078322 409 010.2,K Ground speed, Kilometers per hour
claytong 0:82ff15078322 410 *48 Checksum
claytong 0:82ff15078322 411
claytong 0:82ff15078322 412
claytong 0:82ff15078322 413
claytong 0:82ff15078322 414 $GPGGA,,,,,,0,05,,,,,,,*63
claytong 0:82ff15078322 415 $GPGGA,,,,,,0,02,,,,,,,*64
claytong 0:82ff15078322 416 $GPGGA,,,,,,0,03,,,,,,,*65
claytong 0:82ff15078322 417 $GPGGA,120609.46,3515.405,S,14904.873,E,0,04,2.24,718,M,14,M,,*42
claytong 0:82ff15078322 418 $GPVTG,000.0,T,346.7,M,0.000,N,0.000,K*48
claytong 0:82ff15078322 419 $GPGGA,120610.46,3515.405,S,14904.873,E,1,04,2.24,718,M,14,M,,*4B
claytong 0:82ff15078322 420 $GPVTG,000.0,T,346.7,M,0.000,N,0.000,K*48
claytong 0:82ff15078322 421 $GPGGA,120611.46,3515.405,S,14904.873,E,1,04,2.24,718,M,14,M,,*4A
claytong 0:82ff15078322 422 $GPVTG,000.0,T,346.7,M,0.000,N,0.000,K*48
claytong 0:82ff15078322 423 $GPGGA,120612.46,3515.405,S,14904.873,E,1,04,2.24,718,M,14,M,,*49
claytong 0:82ff15078322 424
claytong 0:82ff15078322 425 */
claytong 0:82ff15078322 426
claytong 0:82ff15078322 427 //---------------------------------------------------------------------------
claytong 0:82ff15078322 428 // END
claytong 0:82ff15078322 429 //---------------------------------------------------------------------------
claytong 0:82ff15078322 430