btle_gap.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 #include "common/common.h "
00017 
00018 #include "app_timer.h "
00019 #include "ble_gap.h"
00020 #include "ble_conn_params.h "
00021 
00022 static inline uint32_t msec_to_1_25msec(uint32_t interval_ms) ATTR_ALWAYS_INLINE ATTR_CONST;
00023 static void   error_callback(uint32_t nrf_error);
00024 
00025 /**************************************************************************/
00026 /*!
00027     @brief      Initialise GAP in the underlying SoftDevice
00028 
00029     @returns
00030 */
00031 /**************************************************************************/
00032 error_t btle_gap_init(void)
00033 {
00034   ble_gap_conn_params_t   gap_conn_params = { 0 };
00035 
00036   gap_conn_params.min_conn_interval = msec_to_1_25msec(CFG_GAP_CONNECTION_MIN_INTERVAL_MS) ; // in 1.25ms unit
00037   gap_conn_params.max_conn_interval = msec_to_1_25msec(CFG_GAP_CONNECTION_MAX_INTERVAL_MS) ; // in 1.25ms unit
00038   gap_conn_params.slave_latency     = CFG_GAP_CONNECTION_SLAVE_LATENCY                     ;
00039   gap_conn_params.conn_sup_timeout  = CFG_GAP_CONNECTION_SUPERVISION_TIMEOUT_MS / 10       ;  // in 10ms unit
00040 
00041   ble_gap_conn_sec_mode_t sec_mode;
00042   BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode); // no security is needed
00043 
00044   ASSERT_STATUS( sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *) CFG_GAP_LOCAL_NAME, strlen(CFG_GAP_LOCAL_NAME)) );
00045   ASSERT_STATUS( sd_ble_gap_appearance_set(CFG_GAP_APPEARANCE) );
00046   ASSERT_STATUS( sd_ble_gap_ppcp_set(&gap_conn_params) );
00047   ASSERT_STATUS( sd_ble_gap_tx_power_set(CFG_BLE_TX_POWER_LEVEL) );
00048 
00049   /* Connection Parameters */
00050   enum {
00051     FIRST_UPDATE_DELAY = APP_TIMER_TICKS(5000, CFG_TIMER_PRESCALER),
00052     NEXT_UPDATE_DELAY  = APP_TIMER_TICKS(5000, CFG_TIMER_PRESCALER),
00053     MAX_UPDATE_COUNT   = 3
00054   };
00055 
00056   ble_conn_params_init_t cp_init = { 0 };
00057 
00058   cp_init.p_conn_params                  = NULL                    ;
00059   cp_init.first_conn_params_update_delay = FIRST_UPDATE_DELAY      ;
00060   cp_init.next_conn_params_update_delay  = NEXT_UPDATE_DELAY       ;
00061   cp_init.max_conn_params_update_count   = MAX_UPDATE_COUNT        ;
00062   cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID ;
00063   cp_init.disconnect_on_fail             = true                    ;
00064   cp_init.evt_handler                    = NULL                    ;
00065   cp_init.error_handler                  = error_callback;
00066 
00067   ASSERT_STATUS ( ble_conn_params_init(&cp_init) );
00068 
00069   return ERROR_NONE;
00070 }
00071 
00072 /**************************************************************************/
00073 /*!
00074     @brief      Converts msecs to an integer representing 1.25ms units
00075 
00076     @param[in]  ms
00077                 The number of milliseconds to conver to 1.25ms units
00078 
00079     @returns    The number of 1.25ms units in the supplied number of ms
00080 */
00081 /**************************************************************************/
00082 static inline uint32_t msec_to_1_25msec(uint32_t interval_ms)
00083 {
00084   return (interval_ms * 4) / 5 ;
00085 }
00086 
00087 static void error_callback(uint32_t nrf_error)
00088 {
00089   ASSERT_STATUS_RET_VOID( nrf_error );
00090 }