1、配置協議棧時鐘與晶振準確度
//按照以上路徑找到最後一個宏定義“NRF_SDH_CLOCK_LF_SRC”,修改這裏即可更改時鐘源
//外部晶振較省電,因爲內部RC校準時必須運行32MHz高速時鐘,比外部多9us電流
//協議棧使用RTC0作爲時鐘
ble_stack_init -> nrf_sdh_enable_request -> .source = NRF_SDH_CLOCK_LF_SRC
//以下結構體成員用來修改晶振的準確度,根據自己晶振的規格書選擇
.accuracy = NRF_SDH_CLOCK_LF_ACCURACY
2、藍牙時間的註冊與管理
//註冊藍牙事件,回調函數爲ble_evt_handler
NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
//主要是連接,斷開事件,超時事件等
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
ret_code_t err_code;
switch (p_ble_evt->header.evt_id)
{
case BLE_GAP_EVT_CONNECTED:
NRF_LOG_INFO("Connected"); //打印GAP連接信息
bsp_board_led_on(CONNECTED_LED); //LED2亮
bsp_board_led_off(ADVERTISING_LED); //LED1滅
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);
err_code = app_button_enable();
APP_ERROR_CHECK(err_code);
break;
case BLE_GAP_EVT_DISCONNECTED:
NRF_LOG_INFO("Disconnected");
bsp_board_led_off(CONNECTED_LED);
m_conn_handle = BLE_CONN_HANDLE_INVALID;
err_code = app_button_disable();
APP_ERROR_CHECK(err_code);
advertising_start();
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_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_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.
NRF_LOG_DEBUG("GATT Client Timeout.");
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.
NRF_LOG_DEBUG("GATT Server Timeout.");
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;
}
}
3、配置鏈接數目以及角色
//配置總的鏈接數目,等於程序中設置的從機和主機的數目和
ble_stack_init -> nrf_sdh_ble_default_cfg_set -> ble_cfg.conn_cfg.params.gap_conn_cfg.conn_count = NRF_SDH_BLE_TOTAL_LINK_COUNT;
//配置GAP事件長度,藍牙底層發送數據包時給的處理時間
ble_cfg.conn_cfg.params.gap_conn_cfg.event_length = NRF_SDH_BLE_GAP_EVENT_LENGTH;
//作爲從機角色,可被連接數目
ble_cfg.gap_cfg.role_count_cfg.periph_role_count = NRF_SDH_BLE_PERIPHERAL_LINK_COUNT;
//作爲主機角色數目,可被連接數目
ble_cfg.gap_cfg.role_count_cfg.central_role_count = NRF_SDH_BLE_CENTRAL_LINK_COUNT;
4、配置MTU協商值
//值越大,一次通訊可傳輸的數據越多
//配置這個宏即可,正常爲23,藍牙4爲23。
NRF_SDH_BLE_GATT_MAX_MTU_SIZE
5、設置UUID
//這個配置的是私人任務數
ble_cfg.common_cfg.vs_uuid_cfg.vs_uuid_count = NRF_SDH_BLE_VS_UUID_COUNT;
7、配置GATT屬性表的大小
ble_cfg.gatts_cfg.attr_tab_size.attr_tab_size = NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE;