https://devzone.nordicsemi.com/f/nordic-q-a/11739/weird-things-happening-with-floats-in-nrf51-gcc-eclipseHello, I wanted to show here two cases that made me crazy today and I fixed using workarounds, but still have no idea why they are happening. In main context I call a function that returns a float, I print this float with RTT and it is always fineen-USTelligent Community 13Mon, 15 Feb 2016 11:18:29 GMThttps://devzone.nordicsemi.com/thread/44403?ContentTypeID=1Mon, 15 Feb 2016 11:18:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b39841bb-1575-48de-aa5b-4b4475f9c839Luis<p>Thanks for the attention Vidar. I discovered that these errors I am seeing could be related to timing as well, because I have seen they disappear when addding / removing unrelated things in those functions... So now I have moved along but I will come back to this later in order to sort it out using GDB as you mentioned. I will update once I test it again. Thank you</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/44402?ContentTypeID=1Wed, 10 Feb 2016 09:53:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:abd79048-4d2a-4335-9217-e4db44bc57d1Vidar Berg<p>Unfortunately, was unable to reproduce the issue you describe here. I used the same linker and compiler flags. If you are familiar with GDB I&#39;d suggest to check whether it is the cast that is failing or that the float value is invalid. For instance in case A you can try to break when sprintf returns NaN and read the value of &#39;b&#39;</p><div style="clear:both;"></div>