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Index › Programming Questions & Help › Electronics, Serial Library › Processing to arduino freeze my sketch

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Processing to arduino freeze my sketch (Read 1313 times)

CreativeK

Processing to arduino freeze my sketch
Feb 26^th, 2009, 3:50am

Hi all, I'm trying to send simple 'int' over serial communication to my arduino. When I test the communication with simple Arduino and Processing sketch everythings working. The problem occur when I integrate serial communication code to an already working Processing sketch. A gray window appear but the sketch doesn't start. As soon as I remove all the 'serial communication code' my original sketch work like it should. I can't find what's the problem. I hope someone can help me! :)

Note: My arduino sketch is fine and perfectly working with his IDE console and a PureData patch.

What the sketch is suppose to do:
- simplify a webcam image to a 6pixels X 6pixels image
- simplify the colors to stay in a range of 8 basics colors
- send to an arduino board throught serial 3 simple informations:
position of the pixel( X and Y) and the colors of this pixel
- those three int should be send separatly

What the arduino board do:
- control a simple 6x6 matrix of red, bleu and green LEDs(108 LEDs)

Here is the code:
Quote:

/**
* Pixelate
* by Hernando Barragan.
*
* Load a QuickTime file and display the video signal
* using rectangles as pixels by reading the values stored
* in the current video frame pixels array.
*/

import processing.serial.*;
import processing.video.*;

Serial port;

int pixelColor = 0;
int r = 0;
int g = 0;
int b = 0;
int ledVal = 0;
int tolerance = 100;
color screenCol = 0;
int grayVal = 0;
int testVal = 0;
int y = 0;

int numPixels;
int blockSize = 80;
// Movie myMovie;

Capture cam;
color myMovieColors[];

void setup() {
size(480, 480, P3D);
port = new Serial(this, Serial.list()[0], 9600);
//colorMode(RGB, 8);
//size(640, 480, P3D);
noStroke();
background(0);

cam = new Capture(this, 6, 6, 15);

numPixels = width / blockSize;
myMovieColors = new color[numPixels * numPixels];
}

// Read new values from movie
void captureEvent(Capture m) {
m.read();
m.loadPixels();

for (int j = 0; j < numPixels; j++) {
for (int i = 0; i < numPixels; i++) {
myMovieColors[j*numPixels + i] = m.get(i, j);
}
}
}

// Display values from movie
void draw() {
for (int j = 0; j < numPixels; j++) {
for (int i = 0; i < numPixels; i++) {
ledVal = 0;
pixelColor = myMovieColors[j*numPixels + i];
r = (pixelColor >> 16) & 0xff;
g = (pixelColor >> 8) & 0xff;
b = pixelColor & 0xff;

grayVal = (r + g + b)/3;

if(grayVal > 5){
if(grayVal >= 22){
if(grayVal >= 38){
if(grayVal >= 88){
if(grayVal >= 140){
if(grayVal >= 176){
if(grayVal >= 229){
ledVal = 0;
testVal = 1;
}
if(testVal != 1){
ledVal = 1;
testVal = 1;
}
}
if(testVal != 1){
ledVal = 4;
testVal = 1;
}
}
if(testVal != 1){
ledVal = 5;
testVal = 1;
}
}
if(testVal != 1){
ledVal = 2;
testVal = 1;
}
}
if(testVal != 1){
ledVal = 3;
testVal = 1;
}
}
if(testVal != 1){
ledVal = 6;
}
}
else{
ledVal = 7;
}
testVal = 0;

CreativeK

Re: Processing to arduino freeze my sketch
Reply #1 - Feb 26^th, 2009, 3:52am

Here's the second part of the program:
Quote:

//===========
/*
if(r >= tolerance){
ledVal = ledVal + 4;
}
if(b >= tolerance){
ledVal = ledVal + 1;
}
if(g >= tolerance){
ledVal = ledVal + 2;
}
*/
//==========

switch(ledVal){
case 0:
screenCol = color(0, 0, 0);
break;
case 1:
screenCol = color(0, 0, 255);
break;
case 2:
screenCol = color(0, 255, 0);
break;
case 3:
screenCol = color(0, 255, 255);
break;
case 4:
screenCol = color(255, 0, 0);
break;
case 5:
screenCol = color(255, 0, 255);
break;
case 6:
screenCol = color(255, 255, 0);
break;
case 7:
screenCol = color(255, 255, 255);
break;
}
switch(i){
case 0:
y = 7;
break;
case 1:
y = 6;
break;
case 2:
y = 5;
break;
case 3:
y = 4;
break;
case 4:
y = 3;
break;
case 5:
y = 2;
break;
}
port.write(j);
//print("ledVal="); println(ledVal);
port.write(y);
port.write(ledVal);
fill(screenCol);
rect(i*blockSize, j*blockSize, blockSize-1, blockSize-1);
}
}
}

thanks to all help I can get! :)

CreativeK

Re: Processing to arduino freeze my sketch
Reply #2 - Feb 27^th, 2009, 2:46am

Well, I've answer my own question after hours and hours of search and experimentations. Here is the answer:
1-It appear that the 'serial initialization code' don't like to be load after the 'Capture initialization code'. So I moved all 'serial code' to just a line before the corresponding 'capture code'. EX:
Before:
Quote:

import processing.video.*;
import processing.serial.*;

Serial port;
Capture cam;

void setup(){
size(480,480, P3D);

port = new Serial(this, Serial.list()[0], 9600);
cam = new Capture(this, 6, 6, 15);

}

void draw(){
//code...
}

After:
Quote:

import processing.video.*;
import processing.serial.*;

Capture cam;
Serial port;

void setup(){
size(480,480, P3D);

cam = new Capture(this, 6, 6, 15);
port = new Serial(this, Serial.list()[0], 9600);

}

void draw(){
//code...
}

It's a strange solution but it's working!

Note that the line 'port = new Serial(this, Serial.list()[0], 9600);' is AFTER the 'size(480,480, P3D);' line. If you want to solve the

Quote:

gnu.io.PortInUseException: Unknown Application
at
gnu.io.CommPortIdentifier.open(CommPortIdentifier.java:354)

error the serial code should always be after the 'size' line. Why? well... I don't know I found this solution at

http://todbot.com/blog/2008/01/14/in-processing-size-matters-for-serial-ports/

I hope it will help someone.

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