Stuck on Interrupts

[Michael]

Sounds like you’re making progress. Memory issues are frustrating because they can be nondeterministic and hard to debug. You will save space by storing your string literals in PROGMEM, so I encourage you to try that again. To access the string, you need to do it a bit differently than normal by using the function pgm_read_word.

Lots of explanation here: http://www.arduino.cc/en/Reference/PROGMEM

It makes most sense when your strings are longer than a few characters. If the string is short, then you don’t really save anything because you are using memory to store the pointers to the strings….

[joey]

Well, I got it working a lot better now although I feel dirty for not following better coding practices.

I’m getting incorrect output from the hour, minute, month, and day bytes though. This is new.

// This is an example of how to always present your callsign and other goodies on a VE

// Note that there is no known way to display the degree symbol as the char chart is different

// Also because of the VERY limited memory size on the Uno, this sketch had to be compressed

// from it's former glory.

// joey@stan4d.net





#include 

#include 

#include 

#include 

#include 



TVout tv;





// You must use uart for this to work

// Create an instance of the TinyGPS object

pollserial pserial;

TinyGPS gps;



// This is where you declare prototypes for the functions that will be

// using the TinyGPS library.

void getgps(TinyGPS &gps);



// Your callsign

const char callsign[] = "NV0N";



//TMP36 Pin Variables

//the analog pin the TMP36's Vout (sense) pin is connected to

//the resolution is 10 mV / degree centigrade

//(500 mV offset) to make negative temperatures an option

const int temperaturePin = 0;





void setup()  {

tv.begin(NTSC, 128, 98);

tv.set_hbi_hook(pserial.begin(4800));

initOverlay();

tv.select_font(font6x8);

tv.fill(0);

}





// Initialize ATMega registers for video overlay capability.

// Must be called after tv.begin().

void initOverlay() {

TCCR1A = 0;

// Enable timer1.  ICES0 is set to 0 for falling edge detection on input capture pin.

TCCR1B = _BV(CS10);



// Enable input capture interrupt

TIMSK1 |= _BV(ICIE1);



// Enable external interrupt INT0 on pin 2 with falling edge.

EIMSK = _BV(INT0);

EICRA = _BV(ISC11);

}



// Required to reset the scan line when the vertical sync occurs

ISR(INT0_vect) {

display.scanLine = 0;

}





void loop() {

tv.delay_frame(1); // flicker prevention



//  callsign



tv.select_font(font6x8);

tv.print(0,0, callsign);





while(pserial.available()) {    // if there is data on the RX pin...

if(gps.encode(pserial.read())) {     // if there is a new valid sentence...

getgps(gps);         // then grab the data.

}

} // while

} // loop





// The getgps function will get and print the values we want.

void getgps(TinyGPS &gps)

{



char buffer[22];

PString message(buffer, sizeof(buffer));

float latitude, longitude;



//  time, date, temp



int year;

byte month, day, hour, minute, second, hundredths;

gps.crack_datetime(&year,&month,&day,&hour,&minute,&second,&hundredths);



message.print(hour);

message += ":";

message.print(minute);

message += " ";

message.print(month);

message += "/";

message.print(day);

message += "/";

message.print(year);

message += "Z ";

message += " ";



// temperature

// Fancy TMP36 calc which converts to Farenheit and then clips to a 2 digit degree

int temperature = int(((((analogRead(temperaturePin) * .004882814) - .5) *100) *1.8) +32);



message.print(temperature);

message += "F";

tv.select_font(font4x6);

tv.print(0,75, message);



// we're going to reuse the buffer so we need to clear it

message.begin();



//  coords, alt



gps.f_get_position(&latitude, &longitude);



// let's process!

message.print(latitude);

message += ", ";

message.print(longitude);

message += " ";



int altitude = int(gps.f_altitude());

message.print(altitude);

message += "M";



tv.print(0,85, message);

}

[joey]

yay working. Just wrapped it in INTs

// This is an example of how to always present your callsign and other goodies on a VE

// Note that there is no known way to display the degree symbol as the char chart is different

// Also because of the VERY limited memory size on the Uno, this sketch had to be compressed

// from it's former glory.

// joey@stan4d.net





#include 

#include 

#include 

#include 

#include 



TVout tv;





// You must use uart for this to work

// Create an instance of the TinyGPS object

pollserial pserial;

TinyGPS gps;



// This is where you declare prototypes for the functions that will be

// using the TinyGPS library.

void getgps(TinyGPS &gps);



// Your callsign

const char callsign[] = "NV0N";



//TMP36 Pin Variables

//the analog pin the TMP36's Vout (sense) pin is connected to

//the resolution is 10 mV / degree centigrade

//(500 mV offset) to make negative temperatures an option

const int temperaturePin = 0;





void setup()  {

tv.begin(NTSC, 128, 98);

tv.set_hbi_hook(pserial.begin(4800));

initOverlay();

tv.select_font(font6x8);

tv.fill(0);

}





// Initialize ATMega registers for video overlay capability.

// Must be called after tv.begin().

void initOverlay() {

TCCR1A = 0;

// Enable timer1.  ICES0 is set to 0 for falling edge detection on input capture pin.

TCCR1B = _BV(CS10);



// Enable input capture interrupt

TIMSK1 |= _BV(ICIE1);



// Enable external interrupt INT0 on pin 2 with falling edge.

EIMSK = _BV(INT0);

EICRA = _BV(ISC11);

}



// Required to reset the scan line when the vertical sync occurs

ISR(INT0_vect) {

display.scanLine = 0;

}





void loop() {

tv.delay_frame(1); // flicker prevention



//  callsign



tv.select_font(font6x8);

tv.print(0,0, callsign);





while(pserial.available()) {    // if there is data on the RX pin...

if(gps.encode(pserial.read())) {     // if there is a new valid sentence...

getgps(gps);         // then grab the data.

}

} // while

} // loop





// The getgps function will get and print the values we want.

void getgps(TinyGPS &gps)

{



char buffer[26];

PString message(buffer, sizeof(buffer));

float latitude, longitude;



//  time, date, temp



int year;

byte month, day, hour, minute, second, hundredths;

gps.crack_datetime(&year,&month,&day,&hour,&minute,&second,&hundredths);



message.print(int(hour));

message += ":";

message.print(int(minute));

message += " ";

message.print(int(month));

message += "/";

message.print(int(day));

message += "/";

message.print(int(year));

message += " UTC ";



// temperature

// Fancy TMP36 calc which converts to Farenheit and then clips to a 2 digit degree

int temperature = int(((((analogRead(temperaturePin) * .004882814) - .5) *100) *1.8) +32);



message.print(temperature);

message += "F";

tv.select_font(font4x6);

tv.print(0,75, message);



// we're going to reuse the buffer so we need to clear it

message.begin();



//  coords, alt



gps.f_get_position(&latitude, &longitude);



// let's process!

message.print(latitude);

message += ", ";

message.print(longitude);

message += " ";



int altitude = int(gps.f_altitude());

message.print(altitude);

message += "M";



tv.print(0,85, message);

}

[joey]

I still get some artifacts every 10 seconds or so at the bottom of the screen. I can’t tell if it’s losing tracking or something else is going on. All the text moves to the right.

[Author]

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