nRF51 RF channel center frequency in BLE mode

RE: nRF51 RF channel center frequency in BLE mode

Kenneth — Tue, 09 Feb 2016 17:27:53 GMT

That is right.

RE: nRF51 RF channel center frequency in BLE mode

phlb — Tue, 09 Feb 2016 13:39:33 GMT

Just one last question. If I develop my own PCB/board with nRF IC, I did not need to do a calibration of radio deviation or other radio parameters?

RE: nRF51 RF channel center frequency in BLE mode

Kenneth — Tue, 09 Feb 2016 11:29:29 GMT

The details is described in PCN-083 : Calibration of Radio Deviation

It's not intended for anyone to modify these values, the calibration is done by Nordic Semiconductor as part of production test of each individual nRF IC.

RE: nRF51 RF channel center frequency in BLE mode

phlb — Tue, 09 Feb 2016 10:46:25 GMT

Ok. what is the unit of this parameter (Hz,kHz,%,..)? where can I find information about this parameter and the calibration procedure?

RE: nRF51 RF channel center frequency in BLE mode

Kenneth — Tue, 09 Feb 2016 10:34:08 GMT

Yes, these calibration values are measured and written in our production, and ensure that the product meet the requirements set in the BLE specifications.

RE: nRF51 RF channel center frequency in BLE mode

phlb — Tue, 09 Feb 2016 10:11:22 GMT

ok, thanks! I forgot this initialization.

The radio override register has an effect on the deviation. This parameter it is obtained by a calibration procedure for each device?

RE: nRF51 RF channel center frequency in BLE mode

Kenneth — Tue, 09 Feb 2016 08:22:49 GMT

The radio override register does not apply here, as it will have an effect on the deviation, not the center frequency. The radio_test example should already do what you describe, but what you might have overlooked is:

static void init(void)
{
    NRF_RNG->TASKS_START = 1;
    
    // Start 16 MHz crystal oscillator
    NRF_CLOCK->EVENTS_HFCLKSTARTED  = 0;
    NRF_CLOCK->TASKS_HFCLKSTART     = 1;

    // Wait for the external oscillator to start up
    while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0)
    {
        // Do nothing.
    }  
}