MAX7219 8x8x4 Dot Matrix

GPS module

#include <SoftwareSerial.h>
#include <TinyGPS.h>
#include <SPI.h>
#include <SD.h>

TinyGPS gps;


SoftwareSerial ss(4, 3);
File myFile;
static void smartdelay(unsigned long ms);
static void print_float(float val, float invalid, int len, int prec);
static void print_int(unsigned long val, unsigned long invalid, int len);
static void print_date(TinyGPS &gps);
static void print_str(const char *str, int len);

void setup()
{
Serial.begin(115200);
ss.begin(9600);
if (!SD.begin(7)) { 
return; 
}
myFile = SD.open("GPS_Data.txt", FILE_WRITE);
myFile.println();
myFile.print("Using TinyGPS library v. ");
myFile.println(TinyGPS::library_version());
myFile.println();
myFile.println("Sats HDOP Latitude Longitude Fix Date Time Date Alt Course Speed Card Distance Course Card Chars Sentences Checksum");
myFile.println(" (deg) (deg) Age Age (m) --- from GPS ---- ---- to City ---- RX RX Fail");
myFile.println("-------------------------------------------------------------------------------------------------------------------------------------");
myFile.close(); 
}

void loop()
{
float flat, flon;
unsigned long age, date, time, chars = 0;
unsigned short sentences = 0, failed = 0;
static const double City_From_LAT = 55.477195, City_From_LON = 8.462352;//City_From_LAT = 51.508131, City_From_LON = -0.128002; London -- City_From_LAT = 55.477195, City_From_LON = 8.462352; Esbjerg Hygge Alle 
myFile = SD.open("GPS_Data.txt", FILE_WRITE);
print_int(gps.satellites(), TinyGPS::GPS_INVALID_SATELLITES, 5);
print_int(gps.hdop(), TinyGPS::GPS_INVALID_HDOP, 5);
gps.f_get_position(&flat, &flon, &age);
print_float(flat, TinyGPS::GPS_INVALID_F_ANGLE, 10, 6);
print_float(flon, TinyGPS::GPS_INVALID_F_ANGLE, 11, 6);
print_int(age, TinyGPS::GPS_INVALID_AGE, 5);
print_date(gps);
print_float(gps.f_altitude(), TinyGPS::GPS_INVALID_F_ALTITUDE, 7, 2);
print_float(gps.f_course(), TinyGPS::GPS_INVALID_F_ANGLE, 7, 2);
print_float(gps.f_speed_kmph(), TinyGPS::GPS_INVALID_F_SPEED, 6, 2);
print_str(gps.f_course() == TinyGPS::GPS_INVALID_F_ANGLE ? "*** " : TinyGPS::cardinal(gps.f_course()), 6);
print_int(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0xFFFFFFFF : (unsigned long)TinyGPS::distance_between(flat, flon, City_From_LAT, City_From_LON) / 1000, 0xFFFFFFFF, 9);
print_float(flat == TinyGPS::GPS_INVALID_F_ANGLE ? TinyGPS::GPS_INVALID_F_ANGLE : TinyGPS::course_to(flat, flon, City_From_LAT, City_From_LON), TinyGPS::GPS_INVALID_F_ANGLE, 7, 2);
print_str(flat == TinyGPS::GPS_INVALID_F_ANGLE ? "*** " : TinyGPS::cardinal(TinyGPS::course_to(flat, flon, City_From_LAT, City_From_LON)), 6);

gps.stats(&chars, &sentences, &failed);
print_int(chars, 0xFFFFFFFF, 6);
print_int(sentences, 0xFFFFFFFF, 10);
print_int(failed, 0xFFFFFFFF, 9);
Serial.print('*');
Serial.println();

myFile.println();
myFile.close(); 

smartdelay(1000);
}

static void print_date(TinyGPS &gps)
{
int year;
byte month, day, hour, minute, second, hundredths;
unsigned long age;
gps.crack_datetime(&year, &month, &day, &hour, &minute, &second, &hundredths, &age);
if (age == TinyGPS::GPS_INVALID_AGE)
myFile.print("********** ******** ");
else
{
char sz[32];
sprintf(sz, "%02d/%02d/%02d %02d:%02d:%02d ",
month, day, year, hour, minute, second);
myFile.print(sz);
}
print_int(age, TinyGPS::GPS_INVALID_AGE, 5);
smartdelay(0);
}

static void print_str(const char *str, int len)
{
int slen = strlen(str);
for (int i=0; i<len; ++i)
myFile.print(i<slen ? str[i] : ' ');
smartdelay(0);
}

static void print_int(unsigned long val, unsigned long invalid, int len)
{
char sz[32];
if (val == invalid)
strcpy(sz, "*******");
else
sprintf(sz, "%ld", val);
sz[len] = 0;
for (int i=strlen(sz); i<len; ++i)
sz[i] = ' ';
if (len > 0) 
sz[len-1] = ' ';
myFile.print(sz);

smartdelay(0);
}

 

static void print_float(float val, float invalid, int len, int prec)
{
if (val == invalid)
{
while (len-- > 1)
myFile.print('*');
myFile.print(' ');
}
else
{
myFile.print(val, prec);
int vi = abs((int)val);
int flen = prec + (val < 0.0 ? 2 : 1); // . and -
flen += vi >= 1000 ? 4 : vi >= 100 ? 3 : vi >= 10 ? 2 : 1;
for (int i=flen; i<len; ++i)
myFile.print(' ');
}
smartdelay(0);
}


static void smartdelay(unsigned long ms)
{
unsigned long start = millis();
do 
{
while (ss.available())
gps.encode(ss.read());
} while (millis() - start < ms);
}