https://devzone.nordicsemi.com/f/nordic-q-a/38280/understanding-hid-mouse-exampleHi, I&#39;m trying to understand mouse_movement_send() function in HID mouse example. Can you please explain what is exactly happening inside this function? I also didnt understand the following lines- buffer[0] = x_delta &amp; 0x00ff; buffer[1] = ((y_deltaen-USTelligent Community 13Fri, 07 Sep 2018 15:23:15 GMThttps://devzone.nordicsemi.com/thread/147844?ContentTypeID=1Fri, 07 Sep 2018 15:23:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cd7cc82f-2107-4b23-a36c-60c1bfdab922tesc<p>Hi,</p> <p>You need to look at the full else block in order to understand what is going on.</p> <p>What I read from the code, is that the mouse movement HID report has two 12 bit fields for x and y movement. The lines that you posted takes the 12 least significant bits from each of x_delta and y_delta, and packs them after each other in a 24 bit buffer (i.e. a buffer of three bytes).</p> <p>&lt;&lt; and &gt;&gt; are bitwise shift operators, which are commonly used for bit manipulation in C. I recommend reading up on &quot;bitwise operators&quot; and &quot;bit manipulation&quot;, in order to understand what is going on. (A web search for those terms should point you to pages teaching you all about them.)</p> <p>I am sorry but we do not have any step-by-step code walk-through of the HID examples.</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>