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Can't detect the custom device after uploading ble_app_beacon example (nRF52810)

mertklic

Hi,

I developed a custom board with nRF52810. Here is my schematic: 

Layout:

I can succesfully upload the "ble_app_beacon" example in SDK17.1.0 with softdevice112 using Segger Embedded Studio.

I power my device with STLink and use JTAG to program it. I connected the GND of STLink and JTAG to achive this. 

I can debug too.

Dont mind the commented lines. I tried to toggle a LED in order to make sure that i can program the device correctly and it worked.

The problem is device is not detectable. I dont think the BLE works properly. Here is my setup. I connected an external 2.4GHz antenna in case my PCB antenna is not good.

I dont know what to do. 

Any help would be great.

Regards,

Mert 

  • +1

    Hi,

     

    Both softdevice.hex + application is loaded, which is good.

    Could you try to run this sequence and see if the HFXO starts up properly?

    NRF_CLOCK->TASKS_HFCLKSTART = 1;
while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;

     

    If you hang in the while-loop, there is a problem with your 32M xtal.

     

    Kind regards,

    Håkon

  • 0 in reply to Håkon Alseth

    Hi Håkon,

    Thank you for your quick reply.

    The code stucks at while loop. You are correct.

    Tomorrow I will check my hardware with oscilloscope and make sure i have good crystal. Maybe i will solder a new one.

    Thanks,

    Regards,

    Mert

  • 0 in reply to mertklic

    Hi Mert,

     

    Good to hear that you found the source of the problem. Usually this is because of excess solder, so try ohm'ing from the can of the crystal to the XC1/XC2 pins. If they read as <10 ohm, it is likely a short from the side of the crystal or underneath it.

     

    Kind regards,

    Håkon

  • 0 in reply to Håkon Alseth

    Hi Håkon,

    The problem was with solder of XC1 and XC2 pins on the processor. Now thanks to you i finally be able to detect my device. Now I have one more question. My low frequency crystal does not seem to work even though i resoldered everything and make sure the connections are good.I think it happens because of the code We added previously.

    NRF_CLOCK->TASKS_HFCLKSTART = 1;
    while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
    NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;

    Do you think i am right? I will try it when i go back home.

    Regards,

    Mert

  • 0 in reply to mertklic

    Hi,

     

    With 12 pF loading caps, your 32k xtal needs to have a CL of 8 pF (C=2*CL-4pF).

    You should check the spec of your 32k xtal.

     

    If all this aligns, you can start the lfclk simillarly as the hfclk:

    /* Start low frequency crystal oscillator for app_timer(used by bsp)*/
NRF_CLOCK->LFCLKSRC            = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
NRF_CLOCK->TASKS_LFCLKSTART    = 1;

while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0)
{
}

     

    Same thing applies, if it hangs in that loop, you have lfclk problems.

    Note that this must be called before softdevice init.

     

    Kind regards,

    Håkon

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