RE: radio test

Håkon Alseth — Tue, 22 Jul 2014 17:28:39 GMT

The frequency shift could be caused by the external 16M not being started. Have you made sure that the 16M xtal is up and running before enabling the radio? Here's a code snippet on how to start it:

// 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.
}

The low output power could be caused by pin VDD_PA not being connected properly to the matching network. This usually gives an attenuation of about ~35 dB.

Is this tested on a custom board, or on one of our kits?

Best regards, Håkon