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

[chinargor]

Hi Øyvind, Thanks for you response and advice. But my problem is that I'm not getting out of the while(NRF_RADIO->EVENTS_READY == 0U) {} loop. It seems that it never become 1U. If I understand timslots currectly, I assume my program should work in a following way. In one timeslot the m_radio_callback function should be called 3 times. First NRF_RADIO_CALLBACK_SIGNAL_TYPE_START Indicate start of the timeslot and wait for the interrupt, than radio interrupt should occur and it should go NRF_RADIO_CALLBACK_SIGNAL_TYPE_RADIO case statement and wait for the packages and when the timeslot time is done, timer interrupt should occur and NRF_RADIO_CALLBACK_SIGNAL_TYPE_TIMER0 brench should execute and request a new timeslot. My problem is that I'm not getting NRF_RADIO->EVENTS_READY. Please correct me if I'm thinking wrong way. Thanks again for your help.

[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?

[chinargor]

Hi,

Thanks for your response, Please find source code bellow.

void m_configure_earliest_timeslot(void)

{

    m_timeslot_request.request_type                = NRF_RADIO_REQ_TYPE_EARLIEST;
    m_timeslot_request.params.earliest.hfclk       = NRF_RADIO_HFCLK_CFG_DEFAULT;
    m_timeslot_request.params.earliest.priority    = NRF_RADIO_PRIORITY_HIGH;
    m_timeslot_request.params.earliest.length_us   = 50000; 
    m_timeslot_request.params.earliest.timeout_us  = 1000000;
}


void m_configure_normal_timeslot(void)

{

    m_timeslot_request.request_type                = NRF_RADIO_REQ_TYPE_NORMAL;
    m_timeslot_request.params.normal.hfclk         = NRF_RADIO_HFCLK_CFG_DEFAULT;
    m_timeslot_request.params.normal.priority      = NRF_RADIO_PRIORITY_HIGH;
    m_timeslot_request.params.normal.length_us     = 50000; 
    m_timeslot_request.params.normal.distance_us   = 1000000;

}

[chinargor]

void read_packet(void)

{


   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

    }


    NRF_RADIO->EVENTS_DISABLED = 0U;
    // Disable radio
    NRF_RADIO->TASKS_DISABLE = 1U;

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