Not funny bug

Development Tools IDE 1.x
1

Hi Guys,

I'm getting crazy..

The Blink-Example doesn't work: Either the led shines all the time or it is off.
But when I put

Serial.begin(9600);
in setup() it works.

Now I compile my sketches on my own (avr-gcc and send with avrdude) and the Blink-Example works.

I made a new sketch with my Wii-Nunchuk, so I have to use the Wire.h library.
Now my Serial-connection is buggy:

Serial.print("h"); // works

-----------------

Serial.println("h");
Serial.println("i"); // Doesn't work

------------------

Serial.print("h");Serial.print("h");Serial.print("h");Serial.print("h");Serial.print("h");
Serial.print("h");Serial.print("h");Serial.print("h");Serial.print("h");                          // works

-----------------

Serial.print("h"); Serial.print("h");Serial.print("h");Serial.print("h");Serial.print("h");
Serial.print("h");Serial.print("h");Serial.print("h");Serial.print("h");Serial.print("h");  // doesn't work... (?)

Doesn't work means, that the programm won't start (my LEDs don't shine) and there's no serial connection (blinking light).

I use the Arduino Uno and my distro is Gentoo

Any ideas?
Thanks for your help!

2

Use "code" not "quote" to post code.

For the best results, post the entire code you are using that does and doesn't work. Snippets are difficult (to impossible) to debug.

3 
#include <Wire.h>

struct nunchuk {
	byte id;
	byte joy_x, joy_y;
	int accu_x, accu_y, accu_z;
	bool z, c;
};

struct nunchuk *nun;

void nun_update(){
	byte h;
	Wire.requestFrom(0x52, 6);
	for( int i=0; i<6 && Wire.available(); i++) {
		h = (Wire.receive() ^ 0x17) + 0x17; // magic.. 
		if( i == 0 ) nun->joy_x = h;
		if( i == 1 ) nun->joy_y = h;
		if( i == 2 ) nun->accu_x = h << 2;
		if( i == 3 ) nun->accu_y = h << 2;
		if( i == 4 ) nun->accu_z = h << 2;
		if( i == 5 ) {
			nun->accu_x |= (h >> 2)&3;
			nun->accu_y |= (h >> 4)&3;
			nun->accu_z |= (h >> 6);
			h&1 ? nun->z = true : nun->z = false;
			h&3 ? nun->c = true : nun->c = false;
		}
	}
	Wire.beginTransmission(0x52);
	Wire.send(0x00);
	Wire.endTransmission();
}

void nun_init(byte id, struct nunchuk *nun){
	nun->id=id;
	Wire.begin();
	Wire.beginTransmission(id);
	Wire.send(0x40);
	Wire.send(0x00);
	Wire.endTransmission();
}


void setup(){
	Serial.begin(9600);
	nun = (struct nunchuk *) malloc(sizeof(struct nunchuk));
	nun_init(0x52,nun);
}

void loop() {
	nun_update();
	Serial.print("x:"); Serial.print(nun->accu_x);
	Serial.print(" y:"); Serial.print(nun->accu_y);
	Serial.print(" z:"); Serial.print(nun->accu_z); 
	Serial.print(" b_c:"); nun->c ? Serial.print("X") : Serial.print("_");
	Serial.print(" b_z:"); nun->z ? Serial.print("X") : Serial.print("_");
	Serial.print(" j_x:"); Serial.print(nun->joy_x);
	Serial.print(" j_y:"); Serial.print(nun->joy_y);
	delay(100);
}

-- doesn't work

void loop() {
	nun_update();
	Serial.print("x:"); Serial.print(nun->accu_x);

	delay(100);
}

-- works

Without nun_update() and nun_init() it works too...

/* Edited, forgot to malloc space */

4

Two things...

  1. This is the wrong section of the forum for this sort of question.

  2. nun is an uninitialized pointer which is always trouble. While not a good solution, the following changes should make the sketch more stable...

struct nunchuk nunstorage;

void setup( void )
{
  nun = &nunstorage;
5

I just changed something and forgot to malloc space.
Why is this the wrong section? Where should I go?

6

Why is this the wrong section?

Installation & Troubleshooting
For problems with Arduino itself, NOT your project

Where should I go?

http://arduino.cc/forum/index.php/board,4.0.html

7

Read my post..
The Blink example doesn't work.
And I have problems with my Serial connection.

This is not about my project.

8

apfelmann:
This is not about my project

...I cannot find that code in any of the examples so I assumed it was your code. Which example are you using?

9

You'll find the Blink example in 1.Basic->Blink

-- is my code.
BUT I ment I don't want to debug my Code. James C4S wanted to see my code and I gave it to him.

I initialized a Wire with no funktions. And my serial connect didn't work.
Blink doesn't work without serial connection in setup().
I think this is troubleshooting.

I'm sorry for missunderstandings, but I don't post often in forums
By the way my english is very bad, I think.

10

I think I understand what you are asking.

Are you saying this code:

void setup() {                
  pinMode(13, OUTPUT);     
}

void loop() {
  digitalWrite(13, HIGH);   // set the LED on
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);    // set the LED off
  delay(1000);              // wait for a second
}

Does not blink pin 13 unless you change setup() to say:

void setup() {
  Serial.begin(9600);
  pinMode(13, OUTPUT);     
}

?

11

Exactly

12 
void setup() {                
  pinMode(13, OUTPUT);     
}

void loop() {
  digitalWrite(13, HIGH);   // set the LED on
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);    // set the LED off
  delay(1000);              // wait for a second
}

The LED shines all the time..

But this one works too..

void setup() {                
  pinMode(13, OUTPUT);     
}

int i = 0;
void loop() {
   i++;
  digitalWrite(13, HIGH);   // set the LED on
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);    // set the LED off
  delay(1000);              // wait for a second
}
13

Ahhh... Sounds like delay() is broken, which was a known issue.

What version of the Arduino IDE are you using?

You might be interested in the last couple of posts on this thread. A couple of posts on updating avr-gcc and binutils to get Gentoo working.

http://arduino.cc/forum/index.php/topic,49900.15.html

14

Sounds to match :wink:
Thanks!