Fixed frequency for factory production test

[james]

Hi,

   We had a product developed with nRF52810( SDK15.3.0 ). Now we want to test RF frequency offset by signal carrier detection.We want to enter factory test mode to transmit a continuous fixed frequency 2402Mhz, it can run normal fuction after exit factory test mode . Can we reffer to radio_test excample to transmit a continuous fixed frequency 2402Mhz？If the  radio_test excample is ok，Can we use radio_unmodulated_tx_carrier() fucntion to  transmit a continuous fixed frequency 2402Mhz?

[Håkon Alseth]

Hi,

 

Can we reffer to radio_test excample to transmit a continuous fixed frequency 2402Mhz？If the  radio_test excample is ok，Can we use radio_unmodulated_tx_carrier() fucntion to  transmit a continuous fixed frequency 2402Mhz?

Yes, you can use radio_test to output a unmodulated carrier at this frequency.

 

Kind regards,

Håkon

[james]

Hi Håkon

  I just need to add radio_unmodulated_tx_carrier()  to my project, it's that right?

[Håkon Alseth]

Hi,

 

Yes, you can copy in the radio_test.c/.h files into your project, or just run radio_test directly.

Please note that the HFCLK must be started prior to calling the function.

 

Kind regards,

Håkon

[james]

Hi Håkon

   I'm sorry for my late reply. Because I wait for the spectrum analyzer. 

either radio_modulated_tx_carrier or radio_unmodulated_tx_carrier, I had tested on spectrum analyzer, but the spectrum analyzer show nothing.

You mention "the HFCLK must be started prior to calling the function", I the call radio_modulated_tx_carrier after 50ms by calling app_timer_start, Is it ok?

How can I make sure the HFCLK  be started prior?

[Håkon Alseth]

Hi,

 

Have you verified that the stock radio_test example works on your end?

james said:

You mention "the HFCLK must be started prior to calling the function", I the call radio_modulated_tx_carrier after 50ms by calling app_timer_start, Is it ok?

App_timer uses the LFCLK, not the HFCLK. Is the softdevice enabled when you're calling the radio_modulated_tx_carrier() function? If yes, then the SoftDevice must be disabled first.

 

Kind regards,

Håkon

[james]

We developed it with nRF52810 ,so the stock radio_test example can't work on our end.

The radio_unmodulated_tx_carrier can work after  the softdevice had been disabled and the HFCLK had been enabled.

But the radio_modulated_tx_carrier() still can't work.What do I miss?

[Håkon Alseth]

Hi,

 

Are you calling the init function, as done in the original radio_test sample?

This also starts the RNG peripheral, required for generating a random address and payload:

/** @brief Function for configuring all peripherals used in this example.
 */
static void init(void)
{
    NRF_RNG->TASKS_START = 1;

#ifndef NRF52810_XXAA
    NRF_NVMC->ICACHECNF  = NVMC_ICACHECNF_CACHEEN_Enabled << NVMC_ICACHECNF_CACHEEN_Pos;
#endif // NRF52810_XXAA 

    // Start 64 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.
    }
}

 

Kind regards,

Håkon