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Topic: Syntax error? GPS Serial fed to screen as text () (Read 288 times) |
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reg
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Syntax error? GPS Serial fed to screen as text ()
« on: Dec 4th, 2004, 6:25pm » |
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Hi.
well I've been fiddling with processing for a while, and this particular problem for ages so any help appreciated. I'm posting here as my less than superior coding skills mean it's more likely a syntax than a serial issue, but...
Aim : read some serial in (from Garmin eTREX via USB serial Adapter), write it back our to the screen as text.
Problem 1: I get intermittent Arrary out of Bound errors (relating to BFont.text?). They are less frequent if I truncate the sentences taken from the GPS. But they happen, and about a third of the time they bring down the whole OS (Blue Screen of Death). Not sure if it's my syntax, the serial coms, or something else.
Problem 2: Normally I stop the serial events with a mousePressed event (see code). However, if I forget, and just stop the App, if I run it again I ALWAYS get the error message below.
I also tried Glenn's original code, but sometimes get EmptyString error, so started with a stripped down version, and ran into this problem.
Any pointers TC, r
//--------CODE-------------------------//
/ GPS Serial ... problems writings strings back to screen as text().
// Stripped down version of code posted by Glen Murphy, glen@glenmurphy.com
//seems to work now I have reset the nmea string after each sentence, before was accumulating data.
BFont metaBold;
String outputSentence = "";
String nmea = "";
boolean speak = false;
void setup() {
size (800,240);
background (0);
outputSentence = "";
nmea = "";
metaBold = loadFont("Meta-Bold.vlw.gz");
speak = false;
beginSerial(4800);
}
void loop() {
if (speak == true) {
background (0);
textFont(metaBold, 22);
text(outputSentence, 25, 25);
text(outputSentence.length(), 25, 50);
//text(nmea.length(), 25, 50);
speak = false;
}
delay(10);
}
void serialEvent() {
processNMEA((char)serial);
}
void mousePressed () {
endSerial (); // Stop the serial port when the mouse is pressed
background (255,0,0);
textFont(metaBold, 22);
text("stopped safely.", 25, 25);
}
void processNMEA(char nmeaIn) {
nmea += nmeaIn;
if(nmeaIn == '\n') {
outputSentence = nmea;
speak = true;
nmea = "";
}
/*
if (nmea.length()>35){
outputSentence = nmea;
speak = true;
//println("truncated...");
nmea = "";
}
*/
}
//-------ERROR MESSAGE--------------//
Error while running applet.java.lang.ArrayIndexOutOfBoundsException: 167 at BFont.text
(BFont.java:523) at BFont.text(BFont.java:670) at BGraphics.text(BGraphics.java:4410) at
BApplet.text(BApplet.java:2833) at Temporary_1026_9401.loop(Temporary_1026_9401.java:27) at
BApplet.nextFrame(BApplet.java:434) at BApplet.run(BApplet.java:369) at java.lang.Thread.run
(Thread.java:536)
//----------SYSTEM-----------//
proce55ing 68, winXPHome, java 1.4.2
p.s. Anyone know where to get 69 from? Also need a way to solve splitStrings() errors and loadVideo() - hogs system resources - that I understand are fixed in 69.
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