strange values from an initialised array

Forum 2005-2010 (read only) Software Syntax & Programs
1

I have a globally declared array called:

int dataArray[8];

in the setup() section I initialise all 8 elements of the array like this:

dataArray[0] = 0x01;
dataArray[1] = 0x02;
dataArray[2] = 0x04;
dataArray[3] = 0x08;
dataArray[4] = 0x10;
dataArray[5] = 0x20;
dataArray[6] = 0x40;
dataArray[7] = 0x80;

In no other part of my program do I assign new values, I only read from the array.

The problem is that when I read the array it gives me wrong numbers, but only for the first three elements!

These are the values I get
dataArray[0] = 8192
dataArray[1] = 16384
dataArray[2] = -32768
dataArray[3] = 8 (correct value)
dataArray[4] = 16 (correct value)

dataArray[7] = 128 (correct value)

Can anyone tell me what is wrong???

2

You could be running out of RAM and overwriting, or you could have some bug so that you are overwriting some other way.

For example, if you had another array declared before dataArray, and the other array only contained 10 bytes but you wrote 16 bytes to it, this would trash dataArray.

-j