nRF51422 using SDK demos causes PC runaway.

RE: nRF51422 using SDK demos causes PC runaway.

Susheel Nuguru — Tue, 10 Jul 2018 14:49:13 GMT

Your understanding is correct. If you want to synthesize the LFCLKbased on HFCLK, then you need to have a crystal HFCLK with good accuracy.

The 16 MHz internal RC oscillator will not give you the needed accuracy to synthesize the LFCLK.

RE: nRF51422 using SDK demos causes PC runaway.

dominicITI — Fri, 06 Jul 2018 23:45:03 GMT

I've tried examples using both the 210 and 310 softdevices. And programming using both IAR and nRFgo Studio. But no matter what I do the code will always fail on "sd_softdevice_enable".

Some info. I am using the 16MHz clock to synth the 32khz clock and I have this set in the application. The board im using doesn't have an external 32 khz clock. Could this be an issue for the ANT soft device? I noticed that it requires crystal accuracy of 50ppm or better and the option is titled "NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM". However I read somewhere that someone said that the accuracy of the synthed clock is based on the accuracy of the 16mhz clock. Is this correct? Will I need to get an external clock to get this thing working?

RE: nRF51422 using SDK demos causes PC runaway.

dominicITI — Fri, 06 Jul 2018 17:58:12 GMT

So the majority of posts that I found did not have resolutions. Or at best just resolved the issue without detailing how.

Upon stepping through the code the problem happens on this line: sd_softdevice_enable

RE: nRF51422 using SDK demos causes PC runaway.

Susheel Nuguru — Wed, 04 Jul 2018 05:03:16 GMT

In that case you can start the application in debug mode and step through the code to find out which API is causing this. Once you find out that we can investigate further.

But looking at this forum, there have been quite many hits with the similar problem, maybe you can correlate one to your ?

RE: nRF51422 using SDK demos causes PC runaway.

dominicITI — Tue, 03 Jul 2018 20:57:57 GMT

So the start address for the application is listed by the soft device as being 0xd000. Which is what i have it set to. The application does correctly start and run to the sd_softdevice_enable line successfully. So I think the start address is correct.

RE: nRF51422 using SDK demos causes PC runaway.

Susheel Nuguru — Tue, 03 Jul 2018 19:32:22 GMT

i am not an expert in ANT softdevice but it most likely seems that your application start address does not match the one ANT softdevice is expecting it to be. Please read the ANT softdevice release notes and check where the application start address needs to be and change this in project settings.