Timeslot events getting blocked

[TJ]

Hi 
I'm trying to integrate the iBeacon and Eddystone protocol together. For this I'm using the timeslot to advertise the packets simultaneously. I have successfully integrated the ibeacon and eddystone together and it is working fine.

But the issue comes when i try to update the advertising interval the radio events are getting blocked. Always it advertises for few seconds and then error pops up. While integrating i have fixed a value for the advertising interval and successfully integrated it but when i change the values of advertising interval the issue arises.

The err_code says ERROR 17 [NRF_ERROR_BUSY]

I do have some questions reg the time-slot parameters

1. while requesting the next event or the earliest does the timeout_us event and length_us have any dependencies on advertising interval? Do we need to change those as per adv interval?

2. using the NRF_LOG_INFO has been an issue with the timeslot. ERROR 17 [NRF_ERROR_BUSY] .

I have attached my code, could you please let me know if i'm doing anything wrong

thanks

 

 

 

 

static enum packet_t packet = IBEACON;

int pdu_count = 1;

uint32_t m_request_earliest_beacon(enum NRF_RADIO_PRIORITY priority)
{
    m_adv.timeslot_request.request_type                = NRF_RADIO_REQ_TYPE_EARLIEST;
    m_adv.timeslot_request.params.earliest.hfclk       = NRF_RADIO_HFCLK_CFG_NO_GUARANTEE;
    m_adv.timeslot_request.params.earliest.priority    = priority;
    m_adv.timeslot_request.params.earliest.length_us   = SLOT_LENGTH;
    m_adv.timeslot_request.params.earliest.timeout_us  = 1000UL;
    return sd_radio_request(&m_adv.timeslot_request);
}

nrf_radio_request_t * m_configure_next_event_beacon(uint32_t interval_us)
{
    m_adv.timeslot_request.request_type              = NRF_RADIO_REQ_TYPE_NORMAL;
    m_adv.timeslot_request.params.normal.hfclk       = NRF_RADIO_HFCLK_CFG_NO_GUARANTEE;
    m_adv.timeslot_request.params.normal.priority    = NRF_RADIO_PRIORITY_HIGH;
    m_adv.timeslot_request.params.normal.distance_us = interval_us * 1000; //to ms
    m_adv.timeslot_request.params.normal.length_us   = SLOT_LENGTH;
    return &m_adv.timeslot_request;
}

uint32_t m_request_normal(void)
{
    m_adv.timeslot_request.request_type                = NRF_RADIO_REQ_TYPE_NORMAL;
    m_adv.timeslot_request.params.normal.hfclk         = NRF_RADIO_HFCLK_CFG_XTAL_GUARANTEED;
    m_adv.timeslot_request.params.normal.priority      = NRF_RADIO_PRIORITY_NORMAL;
    m_adv.timeslot_request.params.normal.distance_us   = _ibeacon_ts.adv_interval * 1000 * 2;
    m_adv.timeslot_request.params.normal.length_us     = SLOT_LENGTH;
    return sd_radio_request(&m_adv.timeslot_request);
}


/* common config */

static void m_configure_radio()
{
    NRF_RADIO->POWER        = 1;
    NRF_RADIO->PCNF0        =   (((1UL) << RADIO_PCNF0_S0LEN_Pos                               ) & RADIO_PCNF0_S0LEN_Msk)
                             | (((2UL) << RADIO_PCNF0_S1LEN_Pos                               ) & RADIO_PCNF0_S1LEN_Msk)
                             | (((6UL) << RADIO_PCNF0_LFLEN_Pos                               ) & RADIO_PCNF0_LFLEN_Msk);
    NRF_RADIO->PCNF1        =   (((RADIO_PCNF1_ENDIAN_Little)     << RADIO_PCNF1_ENDIAN_Pos    ) & RADIO_PCNF1_ENDIAN_Msk)
	                     | (((3UL)                           << RADIO_PCNF1_BALEN_Pos     ) & RADIO_PCNF1_BALEN_Msk)
	                     | (((0UL)                           << RADIO_PCNF1_STATLEN_Pos   ) & RADIO_PCNF1_STATLEN_Msk)
	                     | ((((uint32_t) 37)                 << RADIO_PCNF1_MAXLEN_Pos    ) & RADIO_PCNF1_MAXLEN_Msk)
	                     | ((RADIO_PCNF1_WHITEEN_Enabled     << RADIO_PCNF1_WHITEEN_Pos   ) & RADIO_PCNF1_WHITEEN_Msk);
    NRF_RADIO->CRCCNF       =   (((RADIO_CRCCNF_SKIPADDR_Skip)    << RADIO_CRCCNF_SKIPADDR_Pos ) & RADIO_CRCCNF_SKIPADDR_Msk)
	                              | (((RADIO_CRCCNF_LEN_Three)        << RADIO_CRCCNF_LEN_Pos      ) & RADIO_CRCCNF_LEN_Msk);
    NRF_RADIO->CRCPOLY      = 0x0000065b;
    NRF_RADIO->RXADDRESSES  = ((RADIO_RXADDRESSES_ADDR0_Enabled)  << RADIO_RXADDRESSES_ADDR0_Pos);
    NRF_RADIO->SHORTS       = ((1 << RADIO_SHORTS_READY_START_Pos) | (1 << RADIO_SHORTS_END_DISABLE_Pos));
    NRF_RADIO->MODE         = ((RADIO_MODE_MODE_Ble_1Mbit)        << RADIO_MODE_MODE_Pos       ) & RADIO_MODE_MODE_Msk;
    NRF_RADIO->TIFS         = 150;
    NRF_RADIO->INTENSET     = (1 << RADIO_INTENSET_DISABLED_Pos);
    NRF_RADIO->PREFIX0      = 0x0000008e; //access_addr[3]
    NRF_RADIO->BASE0        = 0x89bed600; //access_addr[0:3]
    NRF_RADIO->CRCINIT      = 0x00555555;

    NVIC_DisableIRQ(RADIO_IRQn);
    NVIC_EnableIRQ(RADIO_IRQn);
}

static void periph_radio_evts_clear(void)
{
    NRF_RADIO->EVENTS_ADDRESS 	= 0;
    NRF_RADIO->EVENTS_BCMATCH 	= 0;
    NRF_RADIO->EVENTS_DEVMATCH 	= 0;
    NRF_RADIO->EVENTS_DEVMISS 	= 0;
    NRF_RADIO->EVENTS_DISABLED 	= 0;
    NRF_RADIO->EVENTS_END 		= 0;
    NRF_RADIO->EVENTS_PAYLOAD 	= 0;
    NRF_RADIO->EVENTS_READY 	= 0;
    NRF_RADIO->EVENTS_RSSIEND 	= 0;
}
static void m_handle_start(uint8_t ch1,uint8_t ch2)
{
    // Configure TX_EN on TIMER EVENT_0
    NRF_PPI->CH[ch1].TEP    = (uint32_t)(&NRF_RADIO->TASKS_TXEN);
    NRF_PPI->CH[ch1].EEP    = (uint32_t)(&NRF_TIMER0->EVENTS_COMPARE[ch2]);
    NRF_PPI->CHENSET      = (1 << ch1);

    // Configure and initiate radio
    m_configure_radio();
    periph_radio_evts_clear();
    NRF_RADIO->TASKS_DISABLE = 1;


}

static void m_set_adv_ch(uint32_t channel)
{
    if (channel == ADV_CHANNEL_37)
    {
        NRF_RADIO->FREQUENCY    = FREQ_ADV_CHANNEL_37;
        NRF_RADIO->DATAWHITEIV  = ADV_CHANNEL_37;
    }
    if (channel == ADV_CHANNEL_38)
    {
        NRF_RADIO->FREQUENCY    = FREQ_ADV_CHANNEL_38;
        NRF_RADIO->DATAWHITEIV  = ADV_CHANNEL_38;
    }
   if (channel == ADV_CHANNEL_39)
    {
        NRF_RADIO->FREQUENCY    = FREQ_ADV_CHANNEL_39;
        NRF_RADIO->DATAWHITEIV  = ADV_CHANNEL_39;
    }
}


static void m_handle_radio_disabled(enum mode_t mode, uint8_t ch)
{
    switch (mode)
    {
        case ADV_RX_CH37:
            m_set_adv_ch(ADV_CHANNEL_37);
            NRF_RADIO->TASKS_TXEN = 1;
            break;
        case ADV_RX_CH38:
            m_set_adv_ch(ADV_CHANNEL_38);
            NRF_TIMER0->TASKS_CLEAR = 1;
            NRF_TIMER0->CC[ch]      = 400;
            break;
        case ADV_RX_CH39:
            m_set_adv_ch(ADV_CHANNEL_39);
            NRF_TIMER0->TASKS_CLEAR = 1;
            NRF_TIMER0->CC[ch]      = 400;

            break;
        default:
            break;
    }
}
void get_eddystone_packet()
{
NRF_RADIO->PACKETPTR = (uint32_t) m_get_adv_packet_es_uid();
               }
}

static nrf_radio_signal_callback_return_param_t * m_timeslot_callback(uint8_t signal_type)
{
   static nrf_radio_signal_callback_return_param_t signal_callback_return_param;
   static enum mode_t mode;

   signal_callback_return_param.params.request.p_next  = NULL;
   signal_callback_return_param.callback_action        = NRF_RADIO_SIGNAL_CALLBACK_ACTION_NONE;

   switch (signal_type) 
   {
    case NRF_RADIO_CALLBACK_SIGNAL_TYPE_START:
         
         NRF_LOG_INFO("i'am in SIGNAL_TYPE_START");
	 switch (packet) 
         {
          case IBEACON:
	       m_handle_start(7,0);
	       break;
	  case EDDYSTONE :
               m_handle_start(8,1);
               break;
	 }
	 mode = ADV_INIT;
	 mode++;
    break;

    case NRF_RADIO_CALLBACK_SIGNAL_TYPE_RADIO:
      
      switch (packet) 
      {
	case IBEACON:
          
          if (NRF_RADIO->EVENTS_DISABLED == 1) 
          {
            NRF_RADIO->EVENTS_DISABLED = 0;
            m_handle_radio_disabled(mode,0);
            mode++;
            
            NRF_RADIO->PACKETPTR = (uint32_t) m_get_adv_packet_ibeacon();
            
            if (mode == ADV_DONE)
            {
              NRF_LOG_INFO("i'am in ibeacon TYPE_RADIO");
              NRF_PPI->CHENCLR = (1 << 7);
              packet = EDDYSTONE;

              if (m_adv.is_running)
              {
		signal_callback_return_param.params.request.p_next = m_configure_next_event_beacon(_ibeacon_ts.adv_interval);
                signal_callback_return_param.callback_action = NRF_RADIO_SIGNAL_CALLBACK_ACTION_REQUEST_AND_END;
              } 
              else 
              {
                signal_callback_return_param.callback_action =NRF_RADIO_SIGNAL_CALLBACK_ACTION_END;
              }
            }
	}
	break;
        
        case EDDYSTONE:

                 if (NRF_RADIO->EVENTS_DISABLED == 1)
                 {
                    NRF_RADIO->EVENTS_DISABLED = 0;
                     m_handle_radio_disabled(mode,1);
                    mode++;
                    get_eddystone_packet();
                   
                    if (mode == ADV_DONE)
                    {
                      NRF_LOG_INFO("i'am in eddystone TYPE_RADIO \n");
                      NRF_PPI->CHENCLR = (1 << 8);

                      packet = IBEACON;
                      if (m_adv.is_running)
                      {
                        signal_callback_return_param.params.request.p_next = m_configure_next_event_beacon(_eddystone.adv_interval);
                        signal_callback_return_param.callback_action       = NRF_RADIO_SIGNAL_CALLBACK_ACTION_REQUEST_AND_END;
                        NRF_RADIO->INTENSET     = (0 << RADIO_INTENSET_DISABLED_Pos);
                      } 
                      else 
                      {
                        signal_callback_return_param.callback_action = NRF_RADIO_SIGNAL_CALLBACK_ACTION_END;
                      }
                    }
                 }        

                break;
      }
      break;

      default:
	if (_ibeacon_ts.error_handler != NULL) 
          {
            _ibeacon_ts.error_handler(NRF_ERROR_INVALID_STATE);
          }
          if (_eddystone.error_handler != NULL) 
          {
            _eddystone.error_handler(NRF_ERROR_INVALID_STATE);
          }
      break;

	}
	return (&signal_callback_return_param);
}

void app_beacon_sd_evt_signal_handler(uint32_t event)
{
    uint32_t err_code;
    NRF_LOG_INFO("app_beacon_on_sys_evt: %d\r\n", event);
    switch (event)
    {
	case NRF_EVT_RADIO_SESSION_IDLE:
		NRF_LOG_INFO("Radio IDLE");
		if (m_adv.is_running)
                {
                  err_code = sd_radio_session_close();
                  APP_ERROR_CHECK(err_code);
		  if ((err_code != NRF_SUCCESS) && (_ibeacon_ts.error_handler != NULL) && (_eddystone.error_handler != NULL))
                  {
                    _ibeacon_ts.error_handler(err_code);
                  } 
                  m_adv.is_running = false;
		}
		break;
	case NRF_EVT_RADIO_SESSION_CLOSED:
		NRF_LOG_INFO("Radio closed");
                if (m_adv.keep_running) 
                {
                  _beacon_advertising_start();
		}

		break;
	case NRF_EVT_RADIO_BLOCKED:
		NRF_LOG_INFO("Radio blocked");
		err_code = sd_radio_session_close();
                APP_ERROR_CHECK(err_code);

		uint32_t err_code = sd_radio_session_open(m_timeslot_callback);
		NRF_LOG_INFO("Timeslot session opened");
		if ((err_code != NRF_SUCCESS) && (_ibeacon_ts.error_handler != NULL) && (_eddystone.error_handler != NULL))
                {
                    _ibeacon_ts.error_handler(err_code);
                } 
		// TODO: A proper solution should try again in <block_count> * m_beacon.adv_interval
		err_code = m_request_earliest_beacon(NRF_RADIO_PRIORITY_HIGH);
		if ((err_code != NRF_SUCCESS) && (_ibeacon_ts.error_handler != NULL) && (_eddystone.error_handler != NULL))
                {
                    _ibeacon_ts.error_handler(err_code);
                } 
		break;

	case NRF_EVT_RADIO_CANCELED: // Fall through
		NRF_LOG_INFO("Timeslot CANCELED");
		 if (m_adv.keep_running)
                 {
                  // TODO: A proper solution should try again in <block_count> * m_beacon.adv_interval
                  // err_code = m_request_earliest(NRF_RADIO_PRIORITY_HIGH);
                  err_code = m_request_normal();
                  if ((err_code != NRF_SUCCESS) && (_ibeacon_ts.error_handler != NULL) && (_eddystone.error_handler != NULL))
                  {
                      _ibeacon_ts.error_handler(err_code);
                  } 
                 }
		break;
        default:
        	NRF_LOG_INFO("Radio default");
        break;
    }
}





void _beacon_advertising_start(void)
{
    m_adv.keep_running = true;
    m_adv.is_running   = true;

    uint32_t err_code = sd_radio_session_open(m_timeslot_callback);
    NRF_LOG_INFO("Timeslot session opened");
    if ((err_code != NRF_SUCCESS) && (_ibeacon_ts.error_handler != NULL) && (_eddystone.error_handler != NULL))
    {
        _ibeacon_ts.error_handler(err_code);
    }
    
    err_code = m_request_earliest_beacon(NRF_RADIO_PRIORITY_HIGH);
    NRF_LOG_INFO("Timeslot request earliest");
    if ((err_code != NRF_SUCCESS) && (_ibeacon_ts.error_handler != NULL) && (_eddystone.error_handler != NULL))
    {
        _ibeacon_ts.error_handler(err_code);
    } 
}



void _beacon_advertising_stop(void)
{
    m_adv.keep_running = false;
}

[Susheel Nuguru]

1. while requesting the next event or the earliest does the timeout_us event and length_us have any dependencies on advertising interval? Do we need to change those as per adv interval?

If you are using timeslots for advertising, then the length_us should be directly related to the advertising interval. That is the smaller the advertising interval of the other beacon, the less probable is it get length_us fit into the timeslot.  Can you for reference show me the numbers for advertising intervals and length_us and timeout_us to get a better picture? 

Regarding the NRF_ERROR_BUSY, Which softdevice version are they using? Was any previous sessions closed using sd_radio_session_close and waiting for NRF_EVT_RADIO_SESSION_CLOSED before calling sd_radio_session_open? 

I can clearly see that in NRF_EVT_RADIO_BLOCKED, you are closing the session and starting the new session immediately without waiting for NRF_EVT_RADIO_SESSION_CLOSED. You should change your code to start a new session after you get NRF_EVT_RADIO_SESSION_CLOSED since session_closed is an async operation.

[TJ]

Thanks for the reply.

im usinf the sd s140_nrf52_6.1.0 and nRF15.2 SDK

Currently im using the SD Adv interval as 250ms and Beacon adv as 100ms and 500ms respectively

I have modified the code and now waiting for the time-slot to end and requesting the new timeslot 

[Susheel Nuguru]

TJ said:

I have modified the code and now waiting for the time-slot to end and requesting the new timeslot 

 Did that solve your issue TJ?

[TJ]

Yes its working now
but is it normal to get the timeslot events blocked frequently and the NRF_SOC_EVTS events i see at event handler are 4 (NRF_EVT_RADIO_BLOCKED) 

[Susheel Nuguru]

it is normal to get blocked if the request coincides with another already approved future or ongoing timeslot

[TJ]

okay thanks for the help 
its working now 

[Susheel Nuguru]

thanks for the confirmation TJ