GPS datalogging problem.

hi!
i new arduino programming please forgive me if question stupid. trying store gps altitude data along data ultrasonic sensor. can program sensor without issue didn't include code. problem outputs 0 : 0.00 : 0 when should 0 : 180.7 : 57. have seconds in there because need have real time clock well. deleted bunch of gps things example didn't think necessary in order fit under memory limit of uno.
code:

quote

#include <spi.h>
#include <sd.h>
#include <adafruit_gps.h>
#include <softwareserial.h>
#include <newping.h>
softwareserial myserial(8, 7);
adafruit_gps gps(&myserial);
#define gpsecho  true
#define trigger_pin  12 
#define echo_pin     11 
#define max_distance 200
int total;
int pin;
newping sonar(trigger_pin, echo_pin, max_distance);
const int chipselect = 10;
void setup() 
{
   

  serial.begin(115200);
  serial.println("adafruit gps library basic test!");

  gps.begin(9600);

  gps.sendcommand(pmtk_set_nmea_output_rmcgga);

  gps.sendcommand(pmtk_set_nmea_update_1hz);   // 1 hz update rate

  gps.sendcommand(pgcmd_antenna);


  pinmode(10, output);
    sd.begin(chipselect);
  delay(1000);
  myserial.println(pmtk_q_release);
}

signal(timer0_compa_vect) {
  char c = gps.read();
}




void loop()                     
{
    char c = gps.read();
  file datafile = sd.open("datalog.txt", file_write);
    datafile.print(total);
    datafile.print(" : ");
    datafile.print(gps.altitude);
    datafile.print(" : ");
    datafile.println(gps.seconds, dec);
    /*datafile.print(now.hour());       
    datafile.print(".");
    datafile.print(now.minute());
    datafile.print(".");
    datafile.println(now.second());*/
    datafile.close();
       
   

 
}

any appreciated!

quote

i deleted bunch of gps things example didn't think necessary in order fit under memory limit of uno.

but, still reading data in loop() , in isr... stop doing 1 of them. (probably isr).

you'll need post link adafruit_gps library.

you need put stuff deleted, too. thought not necessary is.

the way reading data wrong.

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