https://devzone.nordicsemi.com/f/nordic-q-a/49937/problem-with-mallocHi, I need to create a dynamic array to send a different number of bytes of data using TWI. Here is how I create an array: When using the malloc function, I always get an array with a size of 4, regardless of the value of the X variable. I alsoen-USTelligent Community 13Wed, 17 Jul 2019 15:58:28 GMThttps://devzone.nordicsemi.com/thread/199063?ContentTypeID=1Wed, 17 Jul 2019 15:58:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:02e46afb-4782-4e1b-9f33-6d3d143cb5a7awneil[quote userid="75765" url="~/f/nordic-q-a/49937/problem-with-malloc"]I need to create a dynamic array to send a different number of bytes of data using TW[/quote] <p>No, you don&#39;t <em><strong>need</strong> </em>a dynamic array for that!</p> <p>You could just create a &quot;normal&quot; array of your maximum size.</p> [quote userid="75765" url="~/f/nordic-q-a/49937/problem-with-malloc"] I always get an array with a size of 4[/quote] <p>How do you determine that ?</p> [quote userid="75765" url="~/f/nordic-q-a/49937/problem-with-malloc"]regardless of the value of the X variable[/quote] <p>What &quot;X variable&quot; ?</p> <p>You are also making the classic mistake of not checking the return value from malloc before using it!</p><div style="clear:both;"></div>