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    <p>For what you say I can only think of 3 possibilities: 1) your assumption that the function is being called on every I2C communication is incorrect, 2) your program has a bug (maybe a memory leak) in some unrelated function which causes the variable <strong>calls</strong> to become corrupted. or 3) two or more threads are calling your function simultaneously and <strong>calls</strong> is being incremented in a different way than you expect, use <strong>></strong> instead of <strong>==</strong>, if this solves the problem, then you are running in a milti-threaded environment and you didn't konw.</p> <p>You need an accurate method to know the exact value of <strong>calls</strong>, if you don't have a debugger and don't have the means to output text either, the only thing you have left to play is time. I don't know you compiler, but I am sure it contains some useful timing functions, so what I would do would be to loop before increment for 10+calls seconds, and after increment again 10+calls seconds, for example:</p> <pre><code>sleep(1000*(10+calls)); ++calls; sleep(1000*(10+calls)); if(calls&gt;8){ // your actual code } </code></pre> <p>I would (chronometer in hand) expect a delay of (10+0 plus 10+1) = 21 seconds on the first call, 23 seconds on the second call, 25 in the third and so on. That way I could be sure the value of <strong>calls</strong> started with 0 and then it was progressively increased until 9.</p> <p>Also, you must test for what you expect not for what you don't expect, so instead of doing this:</p> <pre><code>++calls; if (calls==0) while (1); </code></pre> <p>do this:</p> <pre><code>++calls; if (calls==1) while (1); </code></pre> <p>that way if your program hangs you can be sure the value of <strong>calls</strong> is exactly 1, and not whatever different from zero. If you count one valid I2C communication and your program hangs then the transition from 0 to 1 was done correctly, so change the hang statement accordingly:</p> <pre><code>++calls; if (calls==2) while (1); </code></pre> <p>Again, if you count 2 valid I2C communications before your program hangs that means that the transition from 1 to 2 was correct, and so on.</p> <p>Another suggestion, try this:</p> <pre><code>uint8_t Times(void){ static uint8_t calls = 0; return ++calls; } void callback(void){ if (Times()&gt;8) { // Your actual code } } </code></pre> <p>And this:</p> <pre><code>void callback(void){ static uint8_t calls = 0; if (calls++&gt;7) { // some code. } } </code></pre> <p>Hope this helps.</p>
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