https://devzone.nordicsemi.com/f/nordic-q-a/8517/n5-starter-kit---ble-testHello everyone, I&#39;m a beginner and i&#39;m trying to debug a nRF51422 BLE project. The SoC is supposed to wait for commands from a STM32 in order to execute some functions. I have the N5 Starter kit and the STM32f4 discovery board. In Keil &#181;Vision, Ien-USTelligent Community 13Wed, 05 Aug 2015 08:43:58 GMThttps://devzone.nordicsemi.com/thread/31101?ContentTypeID=1Wed, 05 Aug 2015 08:43:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:aa7eae72-3202-489c-8cce-53b54f8764b9Petter Myhre<p>Our SDK uses an error system, so you can use the debugger to check that functions doesn&#39;t return an error, that they return 0x00000000 = NRF_SUCCESS.</p> <p>nRF51422 has UART, so if STM32 also has a UART you should be able to connect them together. I don&#39;t have experience with STM32 though.</p> <p>Another option could be to buy something like <a href="http://www.dx.com/p/usb-to-uart-5-pin-cp2102-module-serial-converter-81872#.VcHJN_mK3dU">this</a>, but this is not something I have tested.</p><div style="clear:both;"></div>