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POArduino multi-dimensional array crash
 

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    <p>I have a block of code that does something to this effect:</p> <pre><code>int pieceX = 0; int pieceY = 0; int board[8][47] = {{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}}; if (pieceX &gt; 0 &amp;&amp; pieceY &lt; 46) { /* If I remove this it doesn't crash */ if (board[pieceX-1][pieceY] == 0 &amp;&amp; board[pieceX][pieceY+1] == 0) { pieceX -= 1; } /*-----------------------------------*/ } </code></pre> <p>As far as I can tell, I'm initializing my array correctly and I'm staying within the index bounds. I don't work much with Processing or Arduino, so I'm hoping it's something simple / obvious.</p> <p>Edit: Hmm.. I just made a minimalistic test version with this code, and it doesn't crash. So, it's something to do with the code not in this example. Damn. Going to try to zero in on those lines. (My bad for posting this before properly isolating the problem code.) While this accurately describes the problem, it does not reproduce it. Strange bug.</p> <p>Edit 2: This doesn't crash:</p> <pre><code>if (buttonA == HIGH) { if (pieceX &gt; 0 &amp;&amp; pieceX &lt; 8 &amp;&amp; pieceY &gt; 0 &amp;&amp; pieceY &lt; 46) { if (board[0][0] == 0) { } } } </code></pre> <p>This doesn't crash:</p> <pre><code>if (buttonA == HIGH) { if (pieceX &gt; 0 &amp;&amp; pieceX &lt; 8 &amp;&amp; pieceY &gt; 0 &amp;&amp; pieceY &lt; 46) { pieceX -= 1; } } </code></pre> <p>This DOES crash:</p> <pre><code>if (buttonA == HIGH) { if (pieceX &gt; 0 &amp;&amp; pieceX &lt; 8 &amp;&amp; pieceY &gt; 0 &amp;&amp; pieceY &lt; 46) { if (board[0][0] == 0) { pieceX -= 1; } } } </code></pre> <p>Any idea what's going on? ButtonA is never HIGH, so.. the code I'm tweaking shouldn't even matter (it all verifies and uploads fine.)</p> <p>Edit 3: This crashes:</p> <pre><code>if (buttonA == HIGH) { if (pieceX &gt; 0 &amp;&amp; pieceX &lt; 8 &amp;&amp; pieceY &gt; 0 &amp;&amp; pieceY &lt; 46) { if (board[0][0] == 0) { pieceX -= 1; } } } </code></pre> <p>This DOES NOT:</p> <pre><code>if (0 == 1) { if (pieceX &gt; 0 &amp;&amp; pieceX &lt; 8 &amp;&amp; pieceY &gt; 0 &amp;&amp; pieceY &lt; 46) { if (board[0][0] == 0) { pieceX -= 1; } } } </code></pre> <p>This crashes:</p> <pre><code>if (buttonA == HIGH) { if (pieceX &gt; 0 &amp;&amp; pieceX &lt; 8 &amp;&amp; pieceY &gt; 0 &amp;&amp; pieceY &lt; 46) { if (board[0][0] == 0) { pieceX = 1; } } } </code></pre> <p>This DOES NOT:</p> <pre><code>if (buttonA == HIGH) { if (pieceX &gt; 0 &amp;&amp; pieceX &lt; 8 &amp;&amp; pieceY &gt; 0 &amp;&amp; pieceY &lt; 46) { pieceX = 1; } } </code></pre> <p>AND THIS DOES NOT:</p> <pre><code>if (buttonA == HIGH) { if (pieceX &gt; 0 &amp;&amp; pieceX &lt; 8 &amp;&amp; pieceY &gt; 0 &amp;&amp; pieceY &lt; 46) { if (board[0][0] == 0) { } } } </code></pre> <p>Edit, <a href="http://pastebin.com/LtcAQ97z" rel="nofollow">here</a>'s the full source code. I'm only a few hours into a black and white Dr Mario clone. I never write in this language, so.. potentially a bit sloppy. More of a random learning experiment in processing / video game hardware / arduino.</p>
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    1. COCan `pieceX` be a value bigger than 7 (You only check whether it is above 0)?
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    2. COIn my larger production version of the code, pieceX and pieceY are currently always equal to zero. I can expand that initial bounds check to `if (pieceX > 0 && pieceX < 8 && pieceY > 0 && pieceY < 46) {` and it will still crash. In my logic, the arduino shouldn't even be thinking about that inner conditional because the outer one is alawys false. I'm not getting any useful debug info. Maybe there's a way to find out more?
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    3. COHow do you know buttonA is not HIGH? Without more context it will be hard to figure out the problem.
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