Processing Error

Core Library Questions

swimfree2..

in Core Library Questions • 1 year ago

Hi,

So I have the following code and when I run it, I get an error of:

Invalid memory access of location 0xb1936b70 eip=0x15fc590c

Any ideas??

import processing.serial.*; //Import the serial library into your sketch
import cc.arduino.*; //Import the Arduino-Firmata library into your sketch
Arduino arduino; //Create an instance of Arduino named arduino (can be any name)
char e;
int ledPin;
char serial;
Serial scope;
String adaptor= "/dev/tty.usbmodem1a21";
void portConnect(){
int portNumber = 99;
String [] ports;
println(Serial.list());
ports = Serial.list();
for(int j = 0; j< ports.length; j++) {
if(adaptor.equals(Serial.list()[j])) portNumber = j;
}
if(portNumber == 99) portNumber = 0;
String portName = Serial.list()[portNumber];
println("Connected to "+portName);
scope = new Serial(this, portName, 9600);
scope.bufferUntil(10);
}
void serialEvent(Serial scope) { // this gets called every time a line feed is received
String recieved = scope.readString() ;
println(recieved + " from serial port"); // show it at the bottom of the processing window
// also do the stuff you want to do when you get things back from the arduino
}
void setup() {
size(200, 200);
print(arduino.list());
arduino = new Arduino(this, Arduino.list()[0], 9600); //defines arduino our board and sets the communication rate
arduino.pinMode(ledPin, Arduino.OUTPUT);
}
void keyPressed() {
print(key);
delay(10);
switch (key) {
case 'e':
case 'E':
scope.write('e');
break;
case 'i':
case 'I':
scope.write('i');
break;
case 'q':
case 'Q':
scope.write('q');
break;
}
};
void keyReleased() {
delay(10);
switch (key) {
case 'e':
case 'E':
scope.write('z');
break;
case 'i':
case 'I':
scope.write('p');
break;
case 'q':
case 'Q':
scope.write('l');
break;
}
};

Also part of the error is:

Jun 3 23:06:55 Mac-2.local java[782] <Error>: CGContextGetCTM: invalid context 0x0

Jun 3 23:06:55 Mac-2.local java[782] <Error>: CGContextSetBaseCTM: invalid context 0x0

Jun 3 23:06:55 Mac-2.local java[782] <Error>: CGContextGetCTM: invalid context 0x0

Jun 3 23:06:55 Mac-2.local java[782] <Error>: CGContextSetBaseCTM: invalid context 0x0

Please help

Replies(3)

Jesse Sco..

Re: Processing Error

1 year ago

What Line Is The Error Occuring On ?

Where Are You Initializing The ledPin variable?

Where Are You Calling the portConnect() function?

You need to give more info.

Eg. Is the Arduino connecting properly with the example sketches?

(You should also give MUCH more detailed / specific subject headings please... 98% of the topics on this board can be classified as 'Processing Errors'... that doesn't help anyone else who ever finds themselves in the same situation and has to search the Forum... )

swimfree2..

Re: Processing Error

1 year ago

Hi, Sorry! ill be more descriptive.

The line of error isn't occurring on a line. It occurs on the bottom of the processing scree (which is black).

Here is the arduino code that I have:

int ledPin;
int ledPin13 = 13;
int ledPin12 = 12;
int ledPin11 = 11;
int sensorPin = A0;
int sensorValue = 0;
int analogPin = 0;
char c = 0;
void setup()
{
pinMode( ledPin, OUTPUT );
Serial.begin( 57600 );
}
void loop()
{
// Wait for a character to arrive at the serial port.
if( Serial.available() > 0 )
{
// Read one byte (character).
c = Serial.read();
switch( c )
{
case 'e':
Serial.println("case e received");
digitalWrite( ledPin13, HIGH );
Serial.println("Pin 13 HIGH");
break;
case 'i':
Serial.println("case i received");
digitalWrite( ledPin12, HIGH );
Serial.println("Pin 12 HIGH");
break;
case 'q':
Serial.println("case q received");
sensorValue = analogRead( sensorPin )/4;
analogWrite(ledPin11, sensorValue);
Serial.println("Pin 11 HIGH");
break;
case 'z':
Serial.println("case q received");
digitalWrite( ledPin13, LOW );
Serial.println("Pin 13 LOW");
break;
case 'p':
Serial.println("case p received");
digitalWrite( ledPin12, LOW );
Serial.println("Pin 12 LOW");
break;
case 'l':
Serial.println("case l received");
digitalWrite( ledPin11, LOW );
Serial.println("Pin 11 LOW");
break;
}
}
}

I am not at all an expert programmer. When I run processing, the arduino board blinks a little then stops, then a square box comes up from the void setup that I created, and then the black screen from the processing tab comes up with the error:

Jun 3 23:19:40 Mac-2.local java[1182] <Error>: CGContextGetCTM: invalid context 0x0

Jun 3 23:19:40 Mac-2.local java[1182] <Error>: CGContextSetBaseCTM: invalid context 0x0

Jun 3 23:19:40 Mac-2.local java[1182] <Error>: CGContextGetCTM: invalid context 0x0

Jun 3 23:19:40 Mac-2.local java[1182] <Error>: CGContextSetBaseCTM: invalid context 0x0

Stable Library

=========================================

Native lib Version = RXTX-2.1-7

Java lib Version = RXTX-2.1-7

[Ljava.lang.String;@3e97df

Experimental: JNI_OnLoad called.

This is the most information I can tell you.

PhiLho

Re: Processing Error

1 year ago

The CGContextGetCTM error has a forum thread dedicated to it (with a subject line as useful as your for search purposes...). Looks like it is more a warning than an error.
Note that the Zoho search is brain dead, it is better to search the forum from Processing.org directly.

The Invalid memory access is more annoying, it looks like one of your native libraries isn't behaving. Hard to tell if that's Serial or the Arduino one.

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