Multiprotocol and radio RXIDLE state

[chinargor]

Hi nrf51 developers,

I'm developing multiprotocol application by combining BLE and a proprietary protocol. I'm using concurrent multiprotocol timeslots API. Started with the ble_app_hrs_with_timeslot example. In that example timer0 generates interrupt, but I modified a little to generate radio interrupt.

My callback function is bellow

nrf_radio_signal_callback_return_param_t * m_radio_callback(uint8_t signal_type)
{   

    switch(signal_type)
    {
        case NRF_RADIO_CALLBACK_SIGNAL_TYPE_START:
            signal_callback_return_param.params.request.p_next = NULL;
            signal_callback_return_param.callback_action = NRF_RADIO_SIGNAL_CALLBACK_ACTION_NONE;
            radio_configure();
	    /* Enable interrupt on events */
	        NRF_RADIO->INTENSET = RADIO_INTENSET_ADDRESS_Msk | RADIO_INTENSET_DISABLED_Msk | RADIO_INTENSET_READY_Msk;
	   /* Enable RADIO interrupts */
	  		NVIC_ClearPendingIRQ(RADIO_IRQn);
			NVIC_EnableIRQ(RADIO_IRQn);
			NRF_RADIO->PACKETPTR = (uint32_t)&packet;
			NRF_RADIO->EVENTS_READY = 0U;		
			/* Enable RX */
            NRF_RADIO->TASKS_RXEN = 1U; 
            while (NRF_RADIO->EVENTS_READY == 0U)
            {
                // **I DON'T UNDERSTAND WHY, IT ALWAYS STAYS HERE**
            }
	       start_timer();
           break;
	    case NRF_RADIO_CALLBACK_SIGNAL_TYPE_RADIO:
		  //**NEVER COMES HERE**
 		   break;
    }
    return (&signal_callback_return_param);
}

I tried to debug and figured out that it never goes to RXIDLE state and stays in a while loop (NRF_RADIO->EVENTS_READY == 0U), I cannot understand why.

I'd really appreciate, if someone could help me. Thanks in advance for your time,

Best regards, Gor

[Øyvind Karlsen]

Hi Gor,

For these things it is a good idea to debug using printf statements, as the SoftDevice may cause hanging when you step or stop the debugger.

Note that if you want to recieve a packet you will want to do this as well after getting NRF_RADIO->EVENTS_READY:

    NRF_RADIO->EVENTS_READY = 0U;
    // Enable radio and wait for ready
    NRF_RADIO->TASKS_RXEN = 1U;

    while (NRF_RADIO->EVENTS_READY == 0U)
    {
        // wait
    }
    NRF_RADIO->EVENTS_END = 0U;
    // Start listening and wait for address received event
    NRF_RADIO->TASKS_START = 1U;

    // Wait for end of packet or buttons state changed
    while (NRF_RADIO->EVENTS_END == 0U)
    {
        // wait
    }

    if (NRF_RADIO->CRCSTATUS == 1U)
    {
        result = packet;
    }
    NRF_RADIO->EVENTS_DISABLED = 0U;
    // Disable radio
    NRF_RADIO->TASKS_DISABLE = 1U;

    while (NRF_RADIO->EVENTS_DISABLED == 0U)
    {
        // wait
    }

Best regards,

Øyvind

[Øyvind Karlsen]

Hi,

It might be that you have requested a timeslot that is too short, so that your application will not have time to finish. Could you post the configuration of the radio and the timeslot setup?