Processing 1.0 - Processing Discourse - Serial Write Error Message

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Index › Programming Questions & Help › Electronics, Serial Library › Serial Write Error Message

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Serial Write Error Message (Read 1709 times)

frank26080115

Serial Write Error Message
Nov 10^th, 2007, 2:09am

I am using a FTDI USB to Serial converter chip to send data at 2400 baud
Code:


import processing.serial.*;

Serial port;

void setup()
{
  port = new Serial(this, 2400);
}

void draw()
{
  port.write(170);
  port.write(170);
  delay(1000);
}

And I receive this error
Code:


Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version   = RXTX-2.1-7

java.lang.NullPointerException
at processing.serial.Serial.write(Serial.java:502)
at Temporary_1405_2451.draw(Temporary_1405_2451.java:12)

java.lang.RuntimeException: Error inside Serial.write()
at processing.serial.Serial.errorMessage(Serial.java:583)
at processing.serial.Serial.write(Serial.java:506)
at Temporary_1405_2451.draw(Temporary_1405_2451.java:12)
at processing.core.PApplet.handleDisplay(PApplet.java:1359)
at processing.core.PGraphics.requestDisplay(PGraphics.java:680)
at processing.core.PApplet.run(PApplet.java:1454)
at java.lang.Thread.run(Unknown Source)

What is wrong? I wired up everything right, my devices are powered, my converter chip is functioning. The code is legit, and even if I run an example code with a higher baud rate, I get the same error.

I need to solve this problem by Saturday night, Sunday is the competition.

I am running Processing 0125 under Ubuntu 7.10

kuki24 YaBB Newbies Offline Posts: 1	Re: Serial Write Error Message Reply #1 - Nov 18^th, 2007, 2:51am hi, Just wondering whether you resolved this error? Cos I am also encountering this error at the moment. Pat

frank26080115 YaBB Newbies Offline Posts: 11	Re: Serial Write Error Message Reply #2 - Nov 18^th, 2007, 5:06am it's a bad example code, look in the reference for better examples.

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