NRF52832蓝牙主模式RSSI获取

• 蓝牙主模式RSSI获取只需要三步

1. 蓝牙连接成功后调用sd_ble_gap_rssi_start函数启动rssi

	sd_ble_gap_rssi_start(m_conn_handle,0,0);

   2.启动后调用sd_ble_gap_rssi_get函数就可以获取到rssi相关信息

 int8_t rssi;
 uint8_t connectChannel;
 sd_ble_gap_rssi_get(m_conn_handle, &rssi,&connectChannel);

1. 蓝牙断开后调用sd_ble_gap_rssi_stop函数停止rssi

	sd_ble_gap_rssi_stop(m_conn_handle);

三个函数的原型说明如下：

/**@brief Start reporting the received signal strength to the application.
 *
 *        A new event is reported whenever the RSSI value changes, until @ref sd_ble_gap_rssi_stop is called.
 *
 * @events
 * @event{@ref BLE_GAP_EVT_RSSI_CHANGED, New RSSI data available. How often the event is generated is
 *                                       dependent on the settings of the threshold_dbm
 *                                       and skip_count input parameters.}
 * @endevents
 *
 * @mscs
 * @mmsc{@ref BLE_GAP_CENTRAL_RSSI_READ_MSC}
 * @mmsc{@ref BLE_GAP_RSSI_FILT_MSC}
 * @endmscs
 *
 * @param[in] conn_handle        Connection handle.
 * @param[in] threshold_dbm      Minimum change in dBm before triggering the @ref BLE_GAP_EVT_RSSI_CHANGED event. Events are disabled if threshold_dbm equals @ref BLE_GAP_RSSI_THRESHOLD_INVALID.
 * @param[in] skip_count         Number of RSSI samples with a change of threshold_dbm or more before sending a new @ref BLE_GAP_EVT_RSSI_CHANGED event.
 *
 * @retval ::NRF_SUCCESS                   Successfully activated RSSI reporting.
 * @retval ::NRF_ERROR_INVALID_STATE       RSSI reporting is already ongoing.
 * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid connection handle supplied.
 */
SVCALL(SD_BLE_GAP_RSSI_START, uint32_t, sd_ble_gap_rssi_start(uint16_t conn_handle, uint8_t threshold_dbm, uint8_t skip_count));


/**@brief Stop reporting the received signal strength.
 *
 * @note  An RSSI change detected before the call but not yet received by the application
 *        may be reported after @ref sd_ble_gap_rssi_stop has been called.
 *
 * @mscs
 * @mmsc{@ref BLE_GAP_CENTRAL_RSSI_READ_MSC}
 * @mmsc{@ref BLE_GAP_RSSI_FILT_MSC}
 * @endmscs
 *
 * @param[in] conn_handle Connection handle.
 *
 * @retval ::NRF_SUCCESS                   Successfully deactivated RSSI reporting.
 * @retval ::NRF_ERROR_INVALID_STATE       RSSI reporting is not ongoing.
 * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid connection handle supplied.
 */
SVCALL(SD_BLE_GAP_RSSI_STOP, uint32_t, sd_ble_gap_rssi_stop(uint16_t conn_handle));


/**@brief Get the received signal strength for the last connection event.
 *
 *        @ref sd_ble_gap_rssi_start must be called to start reporting RSSI before using this function. @ref NRF_ERROR_NOT_FOUND
 *        will be returned until RSSI was sampled for the first time after calling @ref sd_ble_gap_rssi_start.
 * @mscs
 * @mmsc{@ref BLE_GAP_CENTRAL_RSSI_READ_MSC}
 * @endmscs
 *
 * @param[in]  conn_handle Connection handle.
 * @param[out] p_rssi      Pointer to the location where the RSSI measurement shall be stored.
 * @param[out] p_ch_index  Pointer to the location where Channel Index for the RSSI measurement shall be stored.
 *
 * @retval ::NRF_SUCCESS                   Successfully read the RSSI.
 * @retval ::NRF_ERROR_NOT_FOUND           No sample is available.
 * @retval ::NRF_ERROR_INVALID_ADDR        Invalid pointer supplied.
 * @retval ::BLE_ERROR_INVALID_CONN_HANDLE Invalid connection handle supplied.
 * @retval ::NRF_ERROR_INVALID_STATE       RSSI reporting is not ongoing.
 */
SVCALL(SD_BLE_GAP_RSSI_GET, uint32_t, sd_ble_gap_rssi_get(uint16_t conn_handle, int8_t *p_rssi, uint8_t *p_ch_index));