【CANNON试用体验】蓝牙模块BlueNRG-MS的使用

五、Design an application using BlueNRG, BlueNRG-MS ACI APIs
对BlueNRG, BlueNRG-MS的基本操作：
1.初始化

• Initialize list heads of ready and free hci data packet queues
  

      --> HCI_Init();

• Init SPI interface for allowing external microcontroller to get access to the BlueNRG features properly
  

     --> SdkEvalSpiInit(SPI_MODE_EXTI);

• Reset the BlueNRG, BlueNRG-MS network coprocessor
  

     --> BlueNRG_RST();

• Configure BlueNRG, BlueNRG-MS public address (if public address is used)
  

     --> uint8_t bdaddr[] = {0xaa, 0x00, 0x00, 0xE1, 0x80, 0x02};
            ret = aci_hal_write_config_data(CONFIG_DATA_PUBADDR_OFFSET,
            CONFIG_DATA_PUBADDR_LEN,bdaddr);
            if(ret) PRINTF("Setting BD_ADDR failed.n");

• Init BLE NRG GATT layer
  

     --> ret = aci_gatt_init();
            if(ret) PRINTF("GATT_Init failed.n");

• Init BLE NRG GAP layer depending on the selected device role
  

     --> uint16_t service_handle, dev_name_char_handle, appearance_char_handle;
            #if GAP_PERIPHERAL
            uint8_t role = GAP_PERIPHERAL_ROLE;
            #else
            uint8_t role = GAP_CENTRAL_ROLE;
            #endif
            #if BLUENRG_MS
            ret = aci_gap_init(role, 0, 0x07, &service_handle,
                                         &dev_name_char_handle, &appearance_char_handle);
            #else
            ret = aci_gap_init(role, &service_handle, &dev_name_char_handle,
                                         &appearance_char_handle);
            #endif
            if(ret) PRINTF("GAP_Init failed.n");

• Set the proper security I/O capability and authentication requirement (if BLE NRG security is used)
  

     --> #if GATT_SERVER
            /* User application function where service and characteristics are defined: refer to Section Services                  & Characteristics Configuration Section
            */
            ret = Add_Server_Services_Characteristics();
            if(ret == BLE_STATUS_SUCCESS)
            PRINTF("Services & Characteristics added successfully.n");
            #else
            PRINTF("Error while adding Services & Characteristics.n");
            #endif

• Define the required Services & Characteristics if the device is a GATT server
• Add a while(1) loopcalling the HCI_Process() API and a specific user application function where user actions/events are processed (advertising, connections, services and characteristics discovery, notification and related events).
  

     --> HCI_Process()
2.Events and events Callback
     The ACI framework notifies this event to the user application through the HCI_Event_CB() callback. The          HCI_Event_CB() callback is called within the HCI_Process()on file hci.c

在CANNON蓝牙LED例程里对应的代码为：
    /* Initialize the BlueNRG SPI driver */
    BNRG_SPI_Init();

    /* Initialize the BlueNRG HCI */
    HCI_Init();

    /* Reset BlueNRG hardware */
    BlueNRG_RST();

    /* loopcalling the HCI_Process() API */
    HCI_Process();

在HCI_Process()函数里不断得判断事件队列是否不为空，如果不为空则说明有事件触发，调用HCI_Event_CB()来处理该事件。
蓝牙LED例程中手机APP向BlueNRG 发送数据会触发EVT_VENDOR，然后对数据进行判断，调用函数ble_device_on_message()去实现LED的亮与灭。