How can i get the state of radio?

[chirag]

Hi, I am using nrf51822 with s110 softdevice version 8.0.

Is there any way i can know the state of my radio at some point in the code execution? In short I want to access NRF_RADIO->STATE register using softdevice. Are there any softdevice calls for this??

Regards.

[Øyvind Karlsen]

Hi,

While it should be possible to read the info out of the register, I think it is a better idea to set up the programmable peripheral interface(PPI) to listen to the radio events and then do something based on that.

As an example the following code toggles pin 24 on the event NRF_RADIO->EVENTS_READY

void blinkyradio_ppi_init(void)
{
    uint32_t err_code = NRF_SUCCESS;
    
    if(!nrf_drv_gpiote_is_init())
    {
        err_code = nrf_drv_gpiote_init();
        APP_ERROR_CHECK(err_code);
    }
    
    NRF_GPIO->DIRSET = 0xFFFF0000UL;
    NRF_GPIO->OUTSET = 0xFFFF0000UL;
    NRF_GPIO->OUTCLR = 0xFFFF0000UL;
    
    //Configure GPIO on pin 24
    NRF_GPIOTE->CONFIG[0] = (GPIOTE_CONFIG_POLARITY_Toggle << GPIOTE_CONFIG_POLARITY_Pos)
                            |((24) << GPIOTE_CONFIG_PSEL_Pos)
                            | (GPIOTE_CONFIG_MODE_Task << GPIOTE_CONFIG_MODE_Pos);
    
    
    NRF_PPI->CH[12].EEP = (uint32_t)(&NRF_RADIO->EVENTS_READY);
    NRF_PPI->CH[12].TEP = (uint32_t)(&NRF_GPIOTE->TASKS_OUT[0]);    //Toggle pin 24
    
    NRF_PPI->CHENSET |= (1 << 12);
}

Does this answer your question?

Best regards,

Øyvind

[chirag]

Thanks Øyvind for the answer but will i be able to access NRF_RADIO register when softdevice is enabled. What i know from the experience is if i try to access this register it gives a hardfault. Please help me with this now..

Regards.

[Øyvind Karlsen]

As described in section 11.3 of the SoftDevice specification access to the RADIO is blocked when the SoftDevice is active.