Problem with idle and BLE

[davide]

I have a problem I'm using nrf52840 DK. The task i want perform is start from idle state, wait for a button signal and the go out from idle, start with a loop where the code performs some measurements and send data via BLE (the measurement and the data send work well)  and then return in idle when i press a button. The problem is that when I'm in idle and in __WFI, arrives some interrupt that moves me out. The only way i found to avoid this is write before __ WFI:  nrf_sdh_disable_request();. The problem is that with this code line then the BLE doesn't work even if after idle i write nrf_sdh_enable_request();.

Any solution to remain in idle also in other way ?

// Idle state
void idle_state() {
  bsp_board_led_on(0);
  bsp_board_led_off(1);
  bsp_board_led_off(2);
  bsp_board_led_off(3);
  flag = 0;
  stop = 0;
  nrf_drv_gpiote_in_event_disable(QDE_IN);
  nrf_drv_gpiote_in_event_enable(button_IN, true);
  nrf_gpio_pin_set(idle_front_end);
  __WFI();
  __SEV();
  __WFI();
}


//Initializing the timer module.

static void timers_init(void) {
  ret_code_t err_code = app_timer_init();
  APP_ERROR_CHECK(err_code);
}


static void gap_params_init(void) {
  uint32_t err_code;
  ble_gap_conn_params_t gap_conn_params;
  ble_gap_conn_sec_mode_t sec_mode;

  BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

  err_code = sd_ble_gap_device_name_set(&sec_mode,
      (const uint8_t *)DEVICE_NAME,
      strlen(DEVICE_NAME));
  APP_ERROR_CHECK(err_code);

  memset(&gap_conn_params, 0, sizeof(gap_conn_params));

  gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
  gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
  gap_conn_params.slave_latency = SLAVE_LATENCY;
  gap_conn_params.conn_sup_timeout = CONN_SUP_TIMEOUT;

  err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
  APP_ERROR_CHECK(err_code);
}


static void nrf_qwr_error_handler(uint32_t nrf_error) {
  APP_ERROR_HANDLER(nrf_error);
}


static void services_init(void) {
  uint32_t err_code;
  ble_nus_init_t nus_init;
  nrf_ble_qwr_init_t qwr_init = {0};

  // Initialize Queued Write Module.
  qwr_init.error_handler = nrf_qwr_error_handler;

  err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init);
  APP_ERROR_CHECK(err_code);

  // Initialize NUS.
  memset(&nus_init, 0, sizeof(nus_init));

  //nus_init.data_handler = nus_data_handler;
  nus_init.data_handler = tx_ready_handler;
  err_code = ble_nus_init(&m_nus, &nus_init);
  APP_ERROR_CHECK(err_code);
}


static void on_conn_params_evt(ble_conn_params_evt_t *p_evt) {
  uint32_t err_code;

  if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED) {
    err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
    APP_ERROR_CHECK(err_code);
  }
}


static void conn_params_error_handler(uint32_t nrf_error) {
  APP_ERROR_HANDLER(nrf_error);
}

/
static void conn_params_init(void) {
  uint32_t err_code;
  ble_conn_params_init_t cp_init;

  memset(&cp_init, 0, sizeof(cp_init));

  cp_init.p_conn_params = NULL;
  cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
  cp_init.next_conn_params_update_delay = NEXT_CONN_PARAMS_UPDATE_DELAY;
  cp_init.max_conn_params_update_count = MAX_CONN_PARAMS_UPDATE_COUNT;
  cp_init.start_on_notify_cccd_handle = BLE_GATT_HANDLE_INVALID;
  cp_init.disconnect_on_fail = false;
  cp_init.evt_handler = on_conn_params_evt;
  cp_init.error_handler = conn_params_error_handler;
  err_code = ble_conn_params_init(&cp_init);
  APP_ERROR_CHECK(err_code);
}


static void sleep_mode_enter(void) {
  uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE);
  APP_ERROR_CHECK(err_code);

  // Prepare wakeup buttons.
  err_code = bsp_btn_ble_sleep_mode_prepare();
  APP_ERROR_CHECK(err_code);

  // Go to system-off mode (this function will not return; wakeup will cause a reset).
  err_code = sd_power_system_off();
  APP_ERROR_CHECK(err_code);
}


static void on_adv_evt(ble_adv_evt_t ble_adv_evt) {
  uint32_t err_code;

  switch (ble_adv_evt) {
  case BLE_ADV_EVT_FAST:
    err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
    //     APP_ERROR_CHECK(err_code);
    break;
  case BLE_ADV_EVT_IDLE:
    sleep_mode_enter();
    break;
  default:
    break;
  }
}


static void ble_evt_handler(ble_evt_t const *p_ble_evt, void *p_context) {
  uint32_t err_code;

  switch (p_ble_evt->header.evt_id) {
  case BLE_GAP_EVT_CONNECTED:
    NRF_LOG_INFO("Connected");
    err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
    APP_ERROR_CHECK(err_code);
    m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
    err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
    APP_ERROR_CHECK(err_code);
    break;

  case BLE_GAP_EVT_DISCONNECTED:
    NRF_LOG_INFO("Disconnected");
    // LED indication will be changed when advertising starts.
    m_conn_handle = BLE_CONN_HANDLE_INVALID;
    break;

  case BLE_GAP_EVT_PHY_UPDATE_REQUEST: {
    NRF_LOG_DEBUG("PHY update request.");
    ble_gap_phys_t const phys =
        {
            .rx_phys = BLE_GAP_PHY_AUTO,
            .tx_phys = BLE_GAP_PHY_AUTO,
        };
    err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
    APP_ERROR_CHECK(err_code);
  } break;

  case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
    // Pairing not supported
    err_code = sd_ble_gap_sec_params_reply(m_conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
    APP_ERROR_CHECK(err_code);
    break;

  case BLE_GATTS_EVT_SYS_ATTR_MISSING:
    // No system attributes have been stored.
    err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
    APP_ERROR_CHECK(err_code);
    break;

  case BLE_GATTC_EVT_TIMEOUT:
    // Disconnect on GATT Client timeout event.
    err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
        BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
    APP_ERROR_CHECK(err_code);
    break;

  case BLE_GATTS_EVT_TIMEOUT:
    // Disconnect on GATT Server timeout event.
    err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
        BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
    APP_ERROR_CHECK(err_code);
    break;

  default:
    // No implementation needed.
    break;
  }
}


static void ble_stack_init(void) {
  ret_code_t err_code;

  err_code = nrf_sdh_enable_request();
  APP_ERROR_CHECK(err_code);

  // Configure the BLE stack using the default settings.
  // Fetch the start address of the application RAM.
  uint32_t ram_start = 0;
  err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
  APP_ERROR_CHECK(err_code);

  // Enable BLE stack.
  err_code = nrf_sdh_ble_enable(&ram_start);
  APP_ERROR_CHECK(err_code);

  // Register a handler for BLE events.
  NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}

//Function for handling events from the GATT library.
void gatt_evt_handler(nrf_ble_gatt_t *p_gatt, nrf_ble_gatt_evt_t const *p_evt) {
  if ((m_conn_handle == p_evt->conn_handle) && (p_evt->evt_id == NRF_BLE_GATT_EVT_ATT_MTU_UPDATED)) {
    m_ble_nus_max_data_len = p_evt->params.att_mtu_effective - OPCODE_LENGTH - HANDLE_LENGTH;
    NRF_LOG_INFO("Data len is set to 0x%X(%d)", m_ble_nus_max_data_len, m_ble_nus_max_data_len);
  }
  NRF_LOG_DEBUG("ATT MTU exchange completed. central 0x%x peripheral 0x%x",
      p_gatt->att_mtu_desired_central,
      p_gatt->att_mtu_desired_periph);
}

/**@brief Function for initializing the GATT library. */
void gatt_init(void) {
  ret_code_t err_code;

  err_code = nrf_ble_gatt_init(&m_gatt, gatt_evt_handler);
  APP_ERROR_CHECK(err_code);

  err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, NRF_SDH_BLE_GATT_MAX_MTU_SIZE);
  APP_ERROR_CHECK(err_code);
}


static void advertising_init(void) {
  uint32_t err_code;
  ble_advertising_init_t init;

  memset(&init, 0, sizeof(init));

  init.advdata.name_type = BLE_ADVDATA_FULL_NAME;
  init.advdata.include_appearance = false;
  init.advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

  init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
  init.srdata.uuids_complete.p_uuids = m_adv_uuids;

  init.config.ble_adv_fast_enabled = true;
  init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
  init.config.ble_adv_fast_timeout = APP_ADV_DURATION;
  init.evt_handler = on_adv_evt;

  err_code = ble_advertising_init(&m_advertising, &init);
  APP_ERROR_CHECK(err_code);

  ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}



static void log_init(void) {
  ret_code_t err_code = NRF_LOG_INIT(NULL);
  APP_ERROR_CHECK(err_code);

  NRF_LOG_DEFAULT_BACKENDS_INIT();
}


static void power_management_init(void)
{
    ret_code_t err_code;
    err_code = nrf_pwr_mgmt_init();
    APP_ERROR_CHECK(err_code);
}



static void advertising_start(void) {
  uint32_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
  APP_ERROR_CHECK(err_code);
}

int main(void)
{

  // Initialize BLE connection
  log_init();
  timers_init();
  ble_stack_init();
  gap_params_init();
  gatt_init();
  services_init();
  advertising_init();
  conn_params_init();

  stop = 1; // idle condition
  for (;;)
  {
    if (stop == 1)
    {
   
    idle_state();
    advertising_start();
    bsp_board_led_off(0);
  }
  bsp_board_led_on(1); // check if board works
  meas_state();
}
return (0);
}

[awneil]

Duplicate: https://devzone.nordicsemi.com/f/nordic-q-a/47974/problem-with-ble