<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I have not looked at the details, so this is just a high level guess:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Timing.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Try putting a delay(10) before you switch between transmit and receive modes. And vice versa.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I had an issue with my RS485 communications where the slave transmitted the ack before the master started listening.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Flushing of data through libraries, HW fifos, radios, … is often opaque to the SW.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>---> Paul<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> TriEmbed [mailto:triembed-bounces@triembed.org] <b>On Behalf Of </b>Nick Meyer via TriEmbed<br><b>Sent:</b> Friday, June 12, 2015 12:03 AM<br><b>To:</b> Kevin Gunn<br><b>Cc:</b> TriEmbed<br><b>Subject:</b> Re: [TriEmbed] Failed transmission with NRF24L01+<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Well, it didn't fix it. But something interesting is happening now. It fails very predictably now.<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>When pressing one button at at time, it will fail when pressing the button and succeed when releasing the button. When pressing multiple at once, it fails completely. I tried this over and over and this was the case every time.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>At least its predictable now!<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Nick<o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Thu, Jun 11, 2015 at 10:03 AM, Kevin Gunn <<a href="mailto:kevin@kevingunn.org" target="_blank">kevin@kevingunn.org</a>> wrote:<o:p></o:p></p><div><p class=MsoNormal>I wonder if the problem is packet acknowledgements. I see that the default for "autoack" is "enabled": <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><a href="http://maniacbug.github.io/RF24/classRF24.html#aec71746d59da978bcbb975167886a2cc" target="_blank">http://maniacbug.github.io/RF24/classRF24.html#aec71746d59da978bcbb975167886a2cc</a><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Disclaimer: I don't know what I'm talking about, but as I IT guy I immediately thought it sounds like a protocol issue with acks.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Kevin <o:p></o:p></p></div></div></div><div><p class=MsoNormal><o:p> </o:p></p><div><div><div><p class=MsoNormal>On Wed, Jun 10, 2015 at 3:16 PM, Nick Meyer via TriEmbed <<a href="mailto:triembed@triembed.org" target="_blank">triembed@triembed.org</a>> wrote:<o:p></o:p></p></div></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><div><p class=MsoNormal>Hi all,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I've been playing with the NRF24L01+ transceivers for a bit.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>To write the sketch, I've been using the <a href="http://maniacbug.github.io/RF24/" target="_blank">RF24</a> library. I've tested out the example sketches and all works well with those. From the examples, I slowly modified them to do what I want, but I'm having an issue with one last part.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>The example I used was a two-way communication setup. I would like to have a simple one way communication (I'm trying to setup a media center remote). Keeping the receiver in listening mode, seems to work okay, but if I try to keep the controller in transmit only mode, then transmission seems to fail.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>If I keep in the two lines<o:p></o:p></p></div><div><p class=MsoNormal>radio.startListening();<o:p></o:p></p></div><div><p class=MsoNormal>radio.stopListening();<o:p></o:p></p></div><div><p class=MsoNormal>then the sketch runs great as far as I can tell.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I posted to SO <a href="http://stackoverflow.com/questions/30656574/rf24-and-arduino-micro-experience-packet-loss" target="_blank">here</a>. If anyone has any ideas, I'd be curious to hear them!<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Best,<o:p></o:p></p></div><div><p class=MsoNormal>Nick<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br>Triangle, NC Embedded Computing mailing list<br><a href="mailto:TriEmbed@triembed.org" target="_blank">TriEmbed@triembed.org</a><br><a href="http://mail.triembed.org/mailman/listinfo/triembed_triembed.org" target="_blank">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org</a><br>TriEmbed web site: <a href="http://TriEmbed.org" target="_blank">http://TriEmbed.org</a><o:p></o:p></p></blockquote></div><p class=MsoNormal><span style='color:#888888'><br><br clear=all><span class=hoenzb><o:p></o:p></span></span></p><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><span class=hoenzb><span style='color:#888888'>-- </span><o:p></o:p></span></p><div><p class=MsoNormal><i><span style='color:#660000'>Life is short: Void the warranty.</span></i><o:p></o:p></p></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>