https://devzone.nordicsemi.com/f/nordic-q-a/2698/working-of-cmsisHi, i am new to Bluetooth technology and have doubts related to cmsis what is cmsis? how cmsis can be used for flow of data from gpio -&gt; processor -&gt;BLE(blutooth low energy) 2)BLE(blutooth low energy) -&gt; processor -&gt;gpio en-USTelligent Community 13Thu, 05 Jun 2014 21:01:35 GMThttps://devzone.nordicsemi.com/thread/10554?ContentTypeID=1Thu, 05 Jun 2014 21:01:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b02ddb0e-a254-4cd4-9dc3-525a1083074cJohn<p>Well, as I understand it CMSIS is the Cortex Microcontroller Software Interface Standard and really isn&#39;t relate to Bluetooth at all. The folks at ARM have a nice webpage that can get you started:</p> <p><a href="http://www.arm.com/products/processors/cortex-m/cortex-microcontroller-software-interface-standard.php">link text</a></p> <p>It just ensures that all ARM Cortex processors present the same interfaces for ease of code portability.</p> <p>Memory required for RTOS? You have to find that out on your own. It will depend on what RTOS you choose.</p><div style="clear:both;"></div>