How to detect if BLE is transmitting or not.?

RE: How to detect if BLE is transmitting or not.?

Pratik_BMek — Fri, 26 May 2017 12:35:00 GMT

It is working after adding the crystal now.

Thanks for your help.

RE: How to detect if BLE is transmitting or not.?

Jørn — Fri, 19 May 2017 10:37:07 GMT

The radio will not work at all without an external crystal to run the high frequency crystal oscillator. It is stated in the product specification page 102, at the end of the HFCLK Clock controller section here.

RE: How to detect if BLE is transmitting or not.?

Pratik_BMek — Fri, 19 May 2017 08:57:50 GMT

@Jørn Frøysa It will help if you can provide a link to any document that says why we can't use internal crystal.? I am just curious about the reason because our is completely dead. If the external crystal improves the performance then antenna should give something at least some weak signal, that's what we thought.
Thanks,

RE: How to detect if BLE is transmitting or not.?

Pratik_BMek — Fri, 19 May 2017 08:52:31 GMT

Thanks for the answer Jorn, we are soon to try with the xtal. Will update results here. Tolerance point is noted. Thanks,

RE: How to detect if BLE is transmitting or not.?

Jørn — Fri, 19 May 2017 08:21:10 GMT

Hello Pratik_BMek

The 32 MHz crystal is required for radio operation, and must be present if you are to use the radio. For BLE the 32 MHz crystal must have a maximum frequency tolerance of +/- 40ppm.

Best regards

Jørn Frøysa

RE: How to detect if BLE is transmitting or not.?

Pratik_BMek — Fri, 19 May 2017 04:29:54 GMT

Thanks for the response Daniel. We had 32MHz crystal on board but we have removed it as they consider it default if it is there. So now we have just removed it, we DO NOT have it on board. However, we haven't changed anything in the program for using internal crystal.

RE: How to detect if BLE is transmitting or not.?

Daniel Wang — Thu, 18 May 2017 19:38:24 GMT

you are using internal 32 kHz clock when starting the softdevice?

#define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_RC, \ .rc_ctiv = 16, \ .rc_temp_ctiv = 0}
nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;
SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

and you have a external 32 MHz crystal on your board?