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Merge pull request #110 from sellensr/master 

Add build() extension
This commit is contained in:
Matt Goodrich 2020-01-18 16:53:14 -05:00 committed by GitHub
parent 309b27c464 2c2272e3fd
commit 36d608b1cb
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 420 additions and 78 deletions
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1
.gitignore vendored Normal file
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@ -0,0 +1 @@
.DS_Store

266
Adafruit_GPS.cpp Executable file → Normal file
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@ -73,7 +73,7 @@ boolean Adafruit_GPS::parse(char *nmea) {
return false;
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
fixquality = atoi(p);
if (fixquality > 0) {
fix = true;
@ -83,23 +83,23 @@ boolean Adafruit_GPS::parse(char *nmea) {
}
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
satellites = atoi(p);
}
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
HDOP = atof(p);
}
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
altitude = atof(p);
}
p = strchr(p, ',') + 1;
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
geoidheight = atof(p);
}
}
@ -130,18 +130,18 @@ boolean Adafruit_GPS::parse(char *nmea) {
// speed
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
speed = atof(p);
}
// angle
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
angle = atof(p);
}
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
uint32_t fulldate = atof(p);
day = fulldate / 10000;
month = (fulldate % 10000) / 100;
@ -180,7 +180,7 @@ boolean Adafruit_GPS::parse(char *nmea) {
// parse out Auto selection, but ignore them
// parse out 3d fixquality
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
fixquality_3d = atoi(p);
}
// skip 12 Satellite PDNs without interpreting them
@ -189,22 +189,38 @@ boolean Adafruit_GPS::parse(char *nmea) {
// parse out PDOP
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
PDOP = atof(p);
}
// parse out HDOP, we also parse this from the GGA sentence. Chipset should
// report the same for both
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
HDOP = atof(p);
}
// parse out VDOP
p = strchr(p, ',') + 1;
if (',' != *p) {
if (!isEmpty(p)) {
VDOP = atof(p);
}
}
#ifdef NMEA_EXTENSIONS // Sentences not required for basic GPS functionality
else if (!strcmp(thisSentence, "TXT")) { //*******************************TXT
if (!isEmpty(p))
txtTot = atoi(p);
p = strchr(p, ',') + 1;
if (!isEmpty(p))
txtN = atoi(p);
p = strchr(p, ',') + 1;
if (!isEmpty(p))
txtID = atoi(p);
p = strchr(p, ',') + 1;
if (!isEmpty(p))
parseStr(txtTXT, p, 61); // copy the text to NMEA TXT max of 61 characters
}
#endif // NMEA_EXTENSIONS
// we dont parse the remaining, yet!
else
return false;
@ -296,6 +312,53 @@ const char *Adafruit_GPS::tokenOnList(char *token, const char **list) {
return NULL; // couldn't find a match
}
/**************************************************************************/
/*!
@brief Parse a string token from pointer p to the next comma, asterisk
or end of string.
@param buff Pointer to the buffer to store the string in
@param p Pointer into a string
@param n Max permitted size of string including terminating 0
@return Pointer to the string buffer
*/
/**************************************************************************/
char *Adafruit_GPS::parseStr(char *buff, char *p, int n) {
char *e = strchr(p, ',');
int len = 0;
if (e) {
len = min(e - p, n - 1);
strncpy(buff, p, len); // copy up to the comma
buff[len] = 0;
} else {
e = strchr(p, '*');
if (e) {
len = min(e - p, n - 1);
strncpy(buff, p, len); // or up to the *
buff[e - p] = 0;
} else {
len = min((int)strlen(p), n - 1);
strncpy(buff, p, len); // or to the end or max capacity
}
}
return buff;
}
/**************************************************************************/
/*!
@brief Is the field empty, or should we try conversion? Won't work
for a text field that starts with an asterisk or a comma, but that
probably violates the NMEA-183 standard.
@param pStart Pointer to the location of the token in the NMEA string
@return true if empty field, false if something there
*/
/**************************************************************************/
bool Adafruit_GPS::isEmpty(char *pStart) {
if (',' != *pStart && '*' != *pStart && pStart != NULL)
return false;
else
return true;
}
/**************************************************************************/
/*!
@brief Add *CS where CS is the two character hex checksum for all but
@ -345,7 +408,7 @@ void Adafruit_GPS::parseLat(char *p) {
int32_t degree;
long minutes;
char degreebuff[10];
if (',' != *p) {
if (!isEmpty(p)) {
strncpy(degreebuff, p, 2);
p += 2;
degreebuff[2] = '\0';
@ -394,7 +457,7 @@ void Adafruit_GPS::parseLon(char *p) {
int32_t degree;
long minutes;
char degreebuff[10];
if (',' != *p) {
if (!isEmpty(p)) {
strncpy(degreebuff, p, 3);
p += 3;
degreebuff[3] = '\0';
@ -419,7 +482,7 @@ void Adafruit_GPS::parseLon(char *p) {
*/
/**************************************************************************/
boolean Adafruit_GPS::parseLonDir(char *p) {
if (',' != *p) {
if (!isEmpty(p)) {
if (p[0] == 'W') {
lon = 'W';
longitudeDegrees *= -1.0;
@ -982,3 +1045,176 @@ static boolean strStartsWith(const char *str, const char *prefix) {
}
return true;
}
#ifdef NMEA_EXTENSIONS
/**************************************************************************/
/*!
@brief Fakes time of receipt of a sentence. Use between build() and parse()
to make the timing look like the sentence arrived from the GPS.
*/
/**************************************************************************/
void Adafruit_GPS::resetSentTime() { sentTime = millis(); }
/**************************************************************************/
/*!
@brief Build an NMEA sentence string based on the relevant variables.
Sentences start with a $, then a two character source identifier, then
a three character sentence name that defines the format, then a comma
and more comma separated fields defined by the sentence name. There are
many sentences listed that are not yet supported. Most of these sentence
definitions were found at http://fort21.ru/download/NMEAdescription.pdf
build() will work with other lengths for source and sentence to allow
extension to building proprietary sentences like $PMTK220,100*2F.
build() will not work properly in an environment that does not support
the %f floating point formatter in sprintf(), and will return NULL.
build() adds Carriage Return and Line Feed to sentences to conform to
NMEA-183, so send your output with a print, not a println.
Some of the data in these test sentences may be arbitrary, e.g. for the
TXT sentence which has a more complicated protocol for multiple lines
sent as a message set. Also, the data in the class variables are presumed
to be valid, so these sentences may contain values that are stale, or
the result of initialization rather than measurement.
@param nmea Pointer to the NMEA string buffer. Must be big enough to
hold the sentence. No guarantee what will be in it if the
building of the sentence fails.
@param thisSource Pointer to the source name string (2 upper case)
@param thisSentence Pointer to the sentence name string (3 upper case)
@param ref Reference for the sentence, usually relative (R) or true (T)
@return Pointer to sentence if successful, NULL if fails
*/
/**************************************************************************/
char *Adafruit_GPS::build(char *nmea, const char *thisSource,
const char *thisSentence, char ref) {
sprintf(nmea, "%6.2f", 123.45); // fail if sprintf() doesn't handle floats
if (strcmp(nmea, "123.45"))
return NULL;
*nmea = '$';
char *p = nmea + 1; // Pointer to move through the sentence
strncpy(p, thisSource, strlen(thisSource));
p += strlen(thisSource);
strncpy(p, thisSentence, strlen(thisSentence));
p += strlen(thisSentence);
*p = ',';
p += 1; // Now $XXSSS, and need to add argument fields
// This may look inefficient, but an M0 will get down the list in about 1 us /
// strcmp()! Put the GPS sentences from Adafruit_GPS at the top to make
// pruning excess code easier. Otherwise, keep them alphabetical for ease of
// reading.
if (!strcmp(thisSentence,
"GGA")) { //********************************************GGA
// GGA Global Positioning System Fix Data. Time, Position and fix related
// data for a GPS receiver
// 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
// | | | | | | | | | | | | | | |
//$--GGA,hhmmss.ss,ddmm.mm,a,dddmm.mm,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh
// 1) Time (UTC)
// 2) Latitude
// 3) N or S (North or South)
// 4) Longitude
// 5) E or W (East or West)
// 6) GPS Quality Indicator, 0 - fix not available, 1 - GPS fix, 2 -
// Differential GPS fix 7) Number of satellites in view, 00 - 12 8)
// Horizontal Dilution of precision 9) Antenna Altitude above/below
// mean-sea-level (geoid) 10) Units of antenna altitude, meters 11) Geoidal
// separation, the difference between the WGS-84 earth
// ellipsoid and mean-sea-level (geoid), "-" means mean-sea-level below
// ellipsoid
// 12) Units of geoidal separation, meters
// 13) Age of differential GPS data, time in seconds since last SC104
// type 1 or 9 update, null field when DGPS is not used
// 14) Differential reference station ID, 0000-1023
// 15) Checksum
sprintf(p, "%09.2f,%09.4f,%c,%010.4f,%c,%d,%02d,%f,%f,M,%f,M,,",
hour * 10000L + minute * 100L + seconds + milliseconds / 1000.,
latitude, lat, longitude, lon, fixquality, satellites, HDOP,
altitude, geoidheight);
} else if (!strcmp(thisSentence,
"GLL")) { //********************************************GLL
// GLL Geographic Position – Latitude/Longitude
// 1 2 3 4 5 6 7
// | | | | | | |
//$--GLL,llll.ll,a,yyyyy.yy,a,hhmmss.ss,A*hh
// 1) Latitude ddmm.mm format
// 2) N or S (North or South)
// 3) Longitude dddmm.mm format
// 4) E or W (East or West)
// 5) Time (UTC)
// 6) Status A - Data Valid, V - Data Invalid
// 7) Checksum
sprintf(p, "%09.4f,%c,%010.4f,%c,%09.2f,A", latitude, lat, longitude, lon,
hour * 10000L + minute * 100L + seconds + milliseconds / 1000.);
} else if (!strcmp(thisSentence,
"GSA")) { //********************************************
// GSA GPS DOP and active satellites
// 1 2 3 14 15 16 17 18
// | | | | | | | |
//$--GSA,a,a,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x.x,x.x,x.x*hh
// 1) Selection mode
// 2) Mode
// 3) ID of 1st satellite used for fix
// 4) ID of 2nd satellite used for fix
// ...
// 14) ID of 12th satellite used for fix
// 15) PDOP in meters
// 16) HDOP in meters
// 17) VDOP in meters
// 18) Checksum
return NULL;
} else if (!strcmp(thisSentence,
"RMC")) { //********************************************RMC
// RMC Recommended Minimum Navigation Information
// 12
// 1 2 3 4 5 6 7 8 9 10 11 |
// | | | | | | | | | | | |
//$--RMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,xxxxxx,x.x,a*hh
// 1) Time (UTC)
// 2) Status, V = Navigation receiver warning
// 3) Latitude
// 4) N or S
// 5) Longitude
// 6) E or W
// 7) Speed over ground, knots
// 8) Track made good, degrees true
// 9) Date, ddmmyy
// 10) Magnetic Variation, degrees
// 11) E or W
// 12) Checksum
sprintf(p, "%09.2f,A,%09.4f,%c,%010.4f,%c,%f,%f,%06d,%f,%c",
hour * 10000L + minute * 100L + seconds + milliseconds / 1000.,
latitude, lat, longitude, lon, speed, angle,
day * 10000 + month * 100 + year, magvariation, mag);
} else if (!strcmp(thisSentence,
"TXT")) { //********************************************TXT
// as mentioned in https://github.com/adafruit/Adafruit_GPS/issues/95
// TXT Text Transmission
// 1 2 3 4 5
// | | | | |
//$--TXT,xx,xx,xx,c--c*hh
// 1) Total Number of Sentences 01-99
// 2) Sentence Number 01-99
// 3) Text Identifier 01-99
// 4) Text String, max 61 characters
// 5) Checksum
sprintf(p, "01,01,23,This is the text of the sample message");
} else {
return NULL; // didn't find a match for the build request
}
addChecksum(nmea); // Successful completion
sprintf(nmea, "%s\r\n",
nmea); // Add Carriage Return and Line Feed to comply with NMEA-183
return nmea; // return pointer to finished product
}
#endif // NMEA_EXTENSIONS

30
Adafruit_GPS.h
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@ -26,6 +26,15 @@
#ifndef _ADAFRUIT_GPS_H
#define _ADAFRUIT_GPS_H
/**************************************************************************/
/**
Comment out the definition of NMEA_EXTENSIONS to make the library use as
little memory as possible for GPS functionality only. The ARDUINO_ARCH_AVR
test should leave it out of any compilations for the UNO and similar. */
#ifndef ARDUINO_ARCH_AVR
#define NMEA_EXTENSIONS ///< if defined will include more NMEA sentences
#endif
#define USE_SW_SERIAL ///< comment this out if you don't want to include
///< software serial in the library
#define GPS_DEFAULT_I2C_ADDR \
@ -232,9 +241,9 @@ public:
///< vertical position
float PDOP; ///< Position Dilution of Precision - Complex maths derives a
///< simple, single number for each kind of DOP
char lat; ///< N/S
char lon; ///< E/W
char mag; ///< Magnetic variation direction
char lat = 'X'; ///< N/S
char lon = 'X'; ///< E/W
char mag = 'X'; ///< Magnetic variation direction
boolean fix; ///< Have a fix?
uint8_t fixquality; ///< Fix quality (0, 1, 2 = Invalid, GPS, DGPS)
uint8_t fixquality_3d; ///< 3D fix quality (1, 3, 3 = Nofix, 2D fix, 3D fix)
@ -257,8 +266,23 @@ public:
uint8_t LOCUS_status; ///< 0: Logging, 1: Stop logging
uint8_t LOCUS_percent; ///< Log life used percentage
#ifdef NMEA_EXTENSIONS
// NMEA additional public functions
char *build(char *nmea, const char *thisSource, const char *thisSentence,
char ref = 'R');
void resetSentTime();
// NMEA additional public variables
char txtTXT[63] = {0}; ///< text content from most recent TXT sentence
int txtTot = 0; ///< total TXT sentences in group
int txtID = 0; ///< id of the text message
int txtN = 0; ///< the TXT sentence number
#endif // NMEA_EXTENSIONS
private:
const char *tokenOnList(char *token, const char **list);
char *parseStr(char *buff, char *p, int n);
bool isEmpty(char *pStart);
void parseTime(char *);
void parseLat(char *);
boolean parseLatDir(char *);

173
examples/GPS_HardwareSerial_Timing/GPS_HardwareSerial_Timing.ino
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@ -1,9 +1,14 @@
// Test code for Ultimate GPS Using Hardware Serial (e.g. GPS Flora or FeatherWing)
// Test code for Ultimate GPS Using Hardware Serial (e.g. GPS Flora or
// FeatherWing)
//
// This code is similar to GPS_HardwareSerial_Parsing, except for the additional
// elements to keep track of how long it has been since time and fix data have been
// received. This approach lets you keep an up to date clock based on GPS time at
// any time in between GPS fixes.
// elements to keep track of how long it has been since time and fix data have
// been received. This approach lets you keep an up to date clock based on GPS
// time at any time in between GPS fixes.
//
// It also shows how to take advantage of the build() function to generate test
// sentences. The additional code is within #ifdef NMEA_EXTENSIONS and #endif
// tags.
//
// This code shows how to listen to the GPS module via polling. Best used with
// Feathers or Flora where you have hardware Serial and no interrupt
@ -27,36 +32,44 @@
// Connect to the GPS on the hardware port
Adafruit_GPS GPS(&GPSSerial);
#ifdef NMEA_EXTENSIONS
// Create another GPS object to hold the state of the boat, with no
// communications, so don't call Boat.begin() in setup. We will build some fake
// sentences from the Boat data to feed to GPS for testing.
Adafruit_GPS Boat(&GPSSerial);
#endif
// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
// Set to 'true' if you want to debug and listen to the raw GPS sentences
#define GPSECHO true
uint32_t timer = millis();
void setup() {
// while (!Serial); // uncomment to have the sketch wait until Serial is
// ready
void setup()
{
//while (!Serial); // uncomment to have the sketch wait until Serial is ready
// connect at 115200 so we can read the GPS fast enough and echo without dropping chars
// also spit it out
// connect at 115200 so we can read the GPS fast enough and echo without
// dropping chars also spit it out
Serial.begin(115200);
Serial.println("Adafruit GPS library basic test!");
// 9600 NMEA is the default baud rate for Adafruit MTK GPS's- some use 4800
GPS.begin(9600);
// uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
// uncomment this line to turn on RMC (recommended minimum) and GGA (fix data)
// including altitude
GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
// uncomment this line to turn on only the "minimum recommended" data
// GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
// For parsing data, we don't suggest using anything but either RMC only or RMC+GGA since
// the parser doesn't care about other sentences at this time
// For parsing data, we don't suggest using anything but either RMC only or
// RMC+GGA since the parser doesn't care about other sentences at this time
// Set the update rate (uncomment the one you want.)
// GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ); // 1 Hz update rate
//GPS.sendCommand(PMTK_SET_NMEA_UPDATE_200_MILLIHERTZ); // 5 second update time
// GPS.sendCommand(PMTK_SET_NMEA_UPDATE_200_MILLIHERTZ); // 5 second update
// time
GPS.sendCommand(PMTK_SET_NMEA_UPDATE_100_MILLIHERTZ); // 10 second update time
// For the parsing code to work nicely and have time to sort thru the data, and
// print it out we don't suggest using anything higher than 1 Hz
// For the parsing code to work nicely and have time to sort thru the data,
// and print it out we don't suggest using anything higher than 1 Hz
// Request updates on antenna status, comment out to keep quiet
GPS.sendCommand(PGCMD_ANTENNA);
@ -73,20 +86,26 @@ void loop() // run over and over again
char c = GPS.read();
// if you want to debug, this is a good time to do it!
if (GPSECHO)
if (c) Serial.print(c);
if (c)
Serial.print(c);
// if a sentence is received, we can check the checksum, parse it...
if (GPS.newNMEAreceived()) {
// a tricky thing here is if we print the NMEA sentence, or data
// we end up not listening and catching other sentences!
// so be very wary if using OUTPUT_ALLDATA and trytng to print out data
//Serial.println(GPS.lastNMEA()); // this also sets the newNMEAreceived() flag to false
if (!GPS.parse(GPS.lastNMEA())) // this also sets the newNMEAreceived() flag to false
return; // we can fail to parse a sentence in which case we should just wait for another
// Serial.println(GPS.lastNMEA()); // this also sets the newNMEAreceived()
// flag to false
if (!GPS.parse(GPS.lastNMEA())) // this also sets the newNMEAreceived() flag
// to false
return; // we can fail to parse a sentence in which case we should just
// wait for another
}
// if millis() or timer wraps around, we'll just reset it
if (timer > millis()) timer = millis();
if (timer > millis())
timer = millis();
// approximately every 2 seconds or so, random intervals, print out the current stats
// approximately every 2 seconds or so, random intervals, print out the
// current stats
static unsigned nextInterval = 2000;
if (millis() - timer > nextInterval) {
timer = millis(); // reset the timer
@ -99,38 +118,100 @@ void loop() // run over and over again
int h = GPS.hour;
int d = GPS.day;
// Adjust time and day forward to account for elapsed time.
// This will break at month boundaries!!! Humans will have to cope with April 31,32 etc.
while(s > 60){ s -= 60; m++; }
while(m > 60){ m -= 60; h++; }
while(h > 24){ h -= 24; d++; }
// This will break at month boundaries!!! Humans will have to cope with
// April 31,32 etc.
while (s > 60) {
s -= 60;
m++;
}
while (m > 60) {
m -= 60;
h++;
}
while (h > 24) {
h -= 24;
d++;
}
// ISO Standard Date Format, with leading zeros https://xkcd.com/1179/
Serial.print("\nDate: ");
Serial.print(GPS.year+2000, DEC); Serial.print("-");
if(GPS.month < 10) Serial.print("0");
Serial.print(GPS.month, DEC); Serial.print("-");
if(d < 10) Serial.print("0");
Serial.print(GPS.year + 2000, DEC);
Serial.print("-");
if (GPS.month < 10)
Serial.print("0");
Serial.print(GPS.month, DEC);
Serial.print("-");
if (d < 10)
Serial.print("0");
Serial.print(d, DEC);
Serial.print(" Time: ");
if(h < 10) Serial.print("0");
Serial.print(h, DEC); Serial.print(':');
if(m < 10) Serial.print("0");
Serial.print(m, DEC); Serial.print(':');
if(s < 10) Serial.print("0");
if (h < 10)
Serial.print("0");
Serial.print(h, DEC);
Serial.print(':');
if (m < 10)
Serial.print("0");
Serial.print(m, DEC);
Serial.print(':');
if (s < 10)
Serial.print("0");
Serial.println(s, 3);
Serial.print("Fix: "); Serial.print((int)GPS.fix);
Serial.print(" quality: "); Serial.println((int)GPS.fixquality);
Serial.print("Times [s] since last fix: "); Serial.print(GPS.secondsSinceFix(),3);
Serial.print(", GPS time: "); Serial.print(GPS.secondsSinceTime(),3);
Serial.print(", GPS date: "); Serial.println(GPS.secondsSinceDate(),3);
Serial.print("Fix: ");
Serial.print((int)GPS.fix);
Serial.print(" quality: ");
Serial.println((int)GPS.fixquality);
Serial.print("Time [s] since last fix: ");
Serial.println(GPS.secondsSinceFix(), 3);
Serial.print(" since last GPS time: ");
Serial.println(GPS.secondsSinceTime(), 3);
Serial.print(" since last GPS date: ");
Serial.println(GPS.secondsSinceDate(), 3);
if (GPS.fix) {
Serial.print("Location: ");
Serial.print(GPS.latitude, 4); Serial.print(GPS.lat);
Serial.print(GPS.latitude, 4);
Serial.print(GPS.lat);
Serial.print(", ");
Serial.print(GPS.longitude, 4); Serial.println(GPS.lon);
Serial.print("Speed (knots): "); Serial.println(GPS.speed);
Serial.print("Angle: "); Serial.println(GPS.angle);
Serial.print("Altitude: "); Serial.println(GPS.altitude);
Serial.print("Satellites: "); Serial.println((int)GPS.satellites);
Serial.print(GPS.longitude, 4);
Serial.println(GPS.lon);
Serial.print("Speed (knots): ");
Serial.println(GPS.speed);
Serial.print("Angle: ");
Serial.println(GPS.angle);
Serial.print("Altitude: ");
Serial.println(GPS.altitude);
Serial.print("Satellites: ");
Serial.println((int)GPS.satellites);
}
#ifdef NMEA_EXTENSIONS
char latestBoat[200] = "";
updateBoat(); // create some test data in Boat
Boat.build(latestBoat, "GN", "RMC"); // make a sentence from Boat data
Serial.print("\nbuild() test output -->"); //
Serial.print(latestBoat); //
GPS.resetSentTime(); // make timing look like it came in on GPS
GPS.parse(latestBoat); // parse the test data and store in GPS
#endif
}
}
#ifdef NMEA_EXTENSIONS
void updateBoat() { // fill up the boat values with some test data to use in
// build()
double t = millis() / 1000.;
double theta = t / 100.; // slow
double gamma = theta * 10; // faster
Boat.latitude = 4400 + sin(theta) * 60;
Boat.lat = 'N';
Boat.longitude = 7600 + cos(theta) * 60;
Boat.lon = 'W';
Boat.fixquality = 2;
Boat.speed = 3 + sin(gamma);
Boat.hour = abs(cos(theta)) * 24;
Boat.minute = 30 + sin(theta / 2) * 30;
Boat.seconds = 30 + sin(gamma) * 30;
Boat.milliseconds = 500 + sin(gamma) * 500;
Boat.year = 1 + abs(sin(theta)) * 25;
Boat.month = 1 + abs(sin(gamma)) * 11;
Boat.day = 1 + abs(sin(gamma)) * 26;
Boat.satellites = abs(cos(gamma)) * 10;
}
#endif