https://devzone.nordicsemi.com/f/nordic-q-a/7135/is-cortex-m0-little-or-big-endianHi Maybe silly question: I was wondering: if I cast a pointer to a uint32_t to an array &quot;buff&quot; of uint8_t, what is held in buff[0], MSByte or LSByte? Or in other words, what is the endianness on the Cortex M0 on the nrf51822? thxen-USTelligent Community 13Tue, 14 Jul 2015 20:29:51 GMThttps://devzone.nordicsemi.com/thread/25213?ContentTypeID=1Tue, 14 Jul 2015 20:29:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b8a216a9-8bb6-4744-8b75-e5f9f359d794Gigel<p>nRF51822 is Little endian.</p> <p>How you can check this easily - erase your nRF51822 target with the jtag, or compile and load your code into the nRF51822 target; look for &quot;JLink Info&quot; messages in your Keil&#39;s Build Output window:</p> <p>Example:</p> <ul> <li>JLink Info: Found Cortex-M0 r0p0, <strong>Little endian</strong>.</li> </ul> <p>Of course, there many are other ways to check endianness :)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/25212?ContentTypeID=1Tue, 19 May 2015 15:22:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:10d9c97a-e810-4557-87f7-081c9bd5e40aRK<p>it&#39;s little.</p><div style="clear:both;"></div>