the clock function is not working in esb_ptx example for nRF52832

[Masoumeh]

Hi, 

as I said before I am working with nRF52832. I can connect with nrf and program it. for example I can make an LED to blink. but when I run the esb_ptx example the program doesn't pass through the clock_initialize() line. I am using the CX2016DB32000D0WZRC1 chip as the crystal. can you help me to find the problem.   

[Einar Thorsrud]

Hi,

but when I run the esb_ptx example the program doesn't pass through the clock_initialize() line.

There is no function called clock_initialize in the SDK 17 (which I see you are using in another question). There is a clocks_start() in the esb_ptx example, though. Is that the one?

That is implemented like this:

void clocks_start( void )
{
    NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
    NRF_CLOCK->TASKS_HFCLKSTART = 1;

    while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
}

So the only thing that could make this not return is if the HFCLKSTARTED event never happens. Can you double check with a debugger if this really is the problem, and the while loop never exits? If so, there is likely a problem with the HF crystal on your HW.

[Masoumeh]

you are right, it is clock_start(). when I comment clock_start() the program runs properly and the LED start blinking, but when the clock_start() line is active, it stops there. I checked the crystal an I even changed it but noting happen. the crystal that i am using has all the features that is said in datasheet. 

[Masoumeh]

Hi, 

I bought the Q22FA12800025 crystal and soldered it on the circuit, but it's not working yet. I sent you my PCB, do you think can it be from the PCB? I will attach it here again. 

0676.PCB.PcbDoc

[Einar Thorsrud]

Hi,

Can you take a photo of your board showing how you have mounted the crystal?

[Masoumeh]

Hi, attached them. 

[Einar Thorsrud]

Everything looks to be correctly oriented. But the soldering under the crystal looks a bit bad, particularly under the XC1 pad. Can you try solder another board and see if that works?

[Masoumeh]

I did it, but nothing changed. I have a question. I have a PCB antenna on my board which I copied it from some manual. the thing is that a part of this antenna is connected to the ground by a via, as you can see below. do you think that it can make any problem for the ground? I used two kind of antenna on my board to check their quality and this part of circuit is not connected to the RF line, but it is connected to ground by via.