Diff: main.cpp

Revision:

12:a895e3581542

Parent:

11:a9c16968e7f6

Child:

13:ff0b39177386

--- a/main.cpp	Sat Jul 01 16:48:47 2017 +0000
+++ b/main.cpp	Sun Jul 02 13:37:27 2017 +0000
@@ -36,11 +36,33 @@
     i2c.write( 0x50, data, 2 );
 }
 
+void set_epoch_from_last_gps_time(void)
+{
+    struct tm t;
+    time_t t_of_day;
+    char two_char_str[3] = {0};
+    memcpy(two_char_str, gpsfix_last_utc_date+4, 2);
+    t.tm_year = atoi(two_char_str)+100;         //Years since 1900
+    memcpy(two_char_str, gpsfix_last_utc_date+2, 2);
+    t.tm_mon = atoi(two_char_str)-1;            // Month, 0 - jan gpsfix_last_utc_date
+    memcpy(two_char_str, gpsfix_last_utc_date, 2);
+    t.tm_mday = atoi(two_char_str);             // Day of the month gpsfix_last_utc_date
+    memcpy(two_char_str, gpsfix_last_utc_time, 2);
+    t.tm_hour = atoi(two_char_str);
+    memcpy(two_char_str, gpsfix_last_utc_time+2, 2);
+    t.tm_min = atoi(two_char_str);
+    memcpy(two_char_str, gpsfix_last_utc_time+4, 2);    
+    t.tm_sec = atoi(two_char_str);
+    t.tm_isdst = 0;        // Is DST on? 1 = yes, 0 = no, -1 = unknown
+    t_of_day = mktime(&t);
+    printf("seconds since the Epoch: %ld\n", (long) t_of_day);
+}
+
 void gps_update(void)
 {
     gps_power(on);
-
-    while (1) {
+    bool wait_for_fix = true;
+    while (wait_for_fix) {
         int checksum = 0;
         char nmea_sentence[82] = {0};   //Fill with NULL terminators to save doing it later
         while (gps.getc()!='$');        //wait for start of sentence
@@ -72,7 +94,7 @@
                 pc.printf( " %s\n\r", token );  //Get the time
                 if (token != NULL) {
                     token = strtok(NULL, ",");
-                    if (*token != 32){          //If there is a time present, record it.
+                    if (*token != 32) {         //If there is a time present, record it.
                         pc.printf("Time: %s\n\r",token);
                         memcpy(gpsfix_last_utc_time, token, sizeof gpsfix_last_utc_time - 1);
                     }
@@ -83,9 +105,10 @@
                         pc.printf("VOID");
                     }
                 }
-                if (*token == 'A') {
+                if (*token == 'A') {                //Is this an 'A'ctive (valid) fix?
                     pc.printf("Got a fix\n\r");
                     gps_power(off);                 //Yes - No need for GPS now
+                    wait_for_fix = false;           //Stop looping now we have a fix.
                     while (gps.readable()) {
                         char dummy = gps.getc();    //Empty serial buffer because overflows reveal MBED bugs :-(
                     }
@@ -101,12 +124,12 @@
                     }
                     if (token != NULL) {
                         token = strtok(NULL, ",");
-                        pc.printf("Longitude: %s\n\r",token);
+                        //pc.printf("Longitude: %s\n\r",token);
                         memcpy(gpsfix_longtitude, token, sizeof gpsfix_longtitude - 1);
                     }
                     if (token != NULL) {
                         token = strtok(NULL, ",");
-                        pc.printf("East/West: %s\n\r",token);
+                        //pc.printf("East/West: %s\n\r",token);
                         gpsfix_ew = *token;
                     }
                     if (token != NULL) {
@@ -131,22 +154,16 @@
                         //pc.printf("Variation East/West: %s\n\r",token);
                     }
                 }
-
             }
         }
-
-
-
-
         while (gps.readable()) {
             char dummy = gps.getc();
         }
     }
+}
 
-}
 int main()
 {
-//
     char    data[2];
     data[0] = 0x1A;     //MAX14690 BootCfg register
     data[1] = 0x30;     //Always-On Mode, off state via PWR_OFF_CMD
@@ -159,8 +176,8 @@
     wait(2);
     while (1) {
         gps_update();
-
-
+        set_epoch_from_last_gps_time();
+        wait(600);
     }
 }