Peter Foden / Mbed 2 deprecated GPS_Logger_01

Dependencies:   mbed

main.cpp@0:2f1a2ad434d7, 2009-09-30 (annotated)

Committer:
prf
Date:
Wed Sep 30 09:32:22 2009 +0000
Revision:
0:2f1a2ad434d7

        

        
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// GPS synchronised data logger





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// Uses the $GPRMC string for time and date





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// synchronisation





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// Code derived from Arduino GPS examples





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// and the MBED GPS library





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// http://www.arduino.cc/





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// Thanks Lady Ada and others!





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#include "mbed.h"





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// Commands for Globalsat EM-406A GPS





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// to turn on or off data strings





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#define RMC_ON   "$PSRF103,4,0,1,1*21\r\n"





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#define RMC_OFF  "$PSRF103,4,0,0,1*20\r\n"





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#define GGA_ON   "$PSRF103,0,0,1,1*25\r\n"





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#define GGA_OFF  "$PSRF103,0,0,0,1*24\r\n"





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#define GSA_ON   "$PSRF103,2,0,1,1*27\r\n"





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#define GSA_OFF  "$PSRF103,2,0,0,1*26\r\n"





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#define GSV_ON   "$PSRF103,3,0,1,1*26\r\n"





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#define GSV_OFF  "$PSRF103,3,0,0,1*27\r\n"





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#define WAAS_ON  "$PSRF151,1*3F\r\n"





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#define WAAS_OFF "$PSRF151,0*3E\r\n"





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// Set up serial ports and LEDs





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// MBED USB port used for console debug messages





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// EM-406A GPS on Pin9 and Pin10





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Serial pc(USBTX, USBRX); // tx, rx - Default 9600 baud





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Serial gps(p9, p10);     // tx, rx - 4800 baud required





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DigitalOut led1(LED1);   // Seconds LED





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DigitalOut led4(LED4);   // Data sent LED





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//char buffidx;





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char msg[256];           // GPS data buffer





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char status;             // GPS status 'V' = Not locked; 'A' = Locked





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char *parseptr;          // Pointer for parsing GPS message





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char time_buff[7] = "000000";





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char date_buff[7] = "000000";





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char sens_buff[7] = "123456";





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// Switch off all but $GPRMC string





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void setgps() {





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    gps.printf(RMC_ON);





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    gps.printf(GGA_OFF);





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    gps.printf(GSA_OFF);





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    gps.printf(GSV_OFF);





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    gps.printf(WAAS_OFF);





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    return;





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}





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// Get line of data from GPS





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void getline() {





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    while (gps.getc() != '$'); // Wait for start of line





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    for (int i=0; i<256; i++) {





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        msg[i] = gps.getc();





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// pc.putc(msg[i]);





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        if (msg[i] == '\r') {





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            msg[i] = 0;





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            return;





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        }





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    }





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}





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// Flash LED 1





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void flashled1(void) {





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    led1 = 1;





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    wait(0.05);





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    led1 = 0;





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    wait(0.05);





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}





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// Flash LED4





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void flashled4(void) {





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    led4 = 1;





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    wait(0.1);





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    led4 = 0;





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    wait(0.1);





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}





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void read_sensor() {





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// Insert code here to read sensor





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// and store data in sens_buff[]





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}





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void send_data() {





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// Insert code to send data





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    pc.printf(sens_buff);





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    pc.printf("\r\n");





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}





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int main(void) {





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    gps.baud(4800);         // NB GPS baud rate 4800





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    pc.printf("\n\rGPS Logger Running!...\n\r");





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    setgps();





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    while (1) {





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        getline();





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        if (strncmp(msg, "GPRMC",5) == 0) {





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            // Put the time into the time array





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            parseptr = msg+6;





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            for (int i = 0; i < 6; i++) {





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                time_buff[i] = parseptr[i];





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            }





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            // Skip through commas in the data string





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            // Firstly to get to the status flag and





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            // then to pick up the date





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            parseptr = strchr(parseptr, ',')+1;





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            status = parseptr[0];





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            parseptr = strchr(parseptr, ',')+1;





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            parseptr = strchr(parseptr, ',')+1;





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            parseptr = strchr(parseptr, ',')+1;





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            parseptr = strchr(parseptr, ',')+1;





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            parseptr = strchr(parseptr, ',')+1;





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            parseptr = strchr(parseptr, ',')+1;





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            parseptr = strchr(parseptr, ',')+1;





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            // Put the date into the date array





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            for (int i = 0; i < 6; i++) {





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                date_buff[i] = parseptr[i];





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            }





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            // Every second output time, date and lock status





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            // to the console and flash LED1





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            pc.printf(time_buff);





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            pc.printf(",");





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            pc.printf(date_buff);





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            pc.printf(",");





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            pc.putc(status);





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            pc.printf("\r\n");





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            flashled1();





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            // Take a sensor reading every minute





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            // ie is the time hh:mm:00





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            if (time_buff[4] == 0x30 && time_buff[5] == 0x30) {





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                pc.printf("\r\nSensor Reading!\r\n");





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                read_sensor();





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                pc.printf("Sending: ");





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                send_data();





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                pc.printf("\r\n");





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                flashled4();





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            }





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        }





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    }





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}





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