阅读的源代码：核心主要是位于BLE/project/SimpleBLEPeripheral部分
阅读的参考文档：TI_BLE_Software_Developer’s_Guide.pdf，BLE_CC2540_DeepDive_Training_2011.pdf，TI_BLE_Sample_Applications_Guide.pdf，SIG的Core_V4.0.pdf
在BLE的源码架构中，感觉是好复杂，还好TI对协议栈不开源，不然就得累死。能力有限只能把整个架构从最简单的主从工作模式入手。
1.BLE中主从机建立连接，到配对和绑定的过程如下图。
正如上图所示，最简单一次蓝牙通信需要以上相关步骤，包括discovery device,connect,pairing,bond等4个主要部分。
2.BLE中的GAP和GATT
初始接触，感觉十分的抽象，到现在为止，GAP个人认为就是监控上图中的交互状态，比如从广播变成连接，到配对等。
GATT通俗理解为用于主从机之间的客户端和服务器端的数据交互，以Attribute Table来体现。
GAP Role Profile:在GAP剧本里所处的4个角色：广播Advertise，主机central，从机Peripheral，观察者Observer。
GATT Attribute:通用属性配置文件。
3.SimpleBLEPeripheral_Init函数解析。
无论是在主机还是从机，任何的蓝牙都将这部分内容作为自己的APPlication，在init中都会完成Bluetooth的GAP，GATT，SM等相关初始化。
void SimpleBLEPeripheral_Init( uint8 task_id ){ simpleBLEPeripheral_TaskID = task_id;
// Setup the GAP Peripheral Role Profile //GAP外设剧本 {
#if defined( CC2540_MINIDK ) // For the CC2540DK-MINI keyfob, device doesn’t start advertising until button is pressed uint8 initial_advertising_enable = FALSE; #else // For other hardware platforms, device starts advertising upon initialization uint8 initial_advertising_enable = TRUE;//广播使能 #endif
// By setting this to zero, the device will go into the waiting state after // being discoverable for 30.72 second, and will not being advertising again // until the enabler is set back to TRUE uint16 gapRole_AdvertOffTime = 0;
uint8 enable_update_request = DEFAULT_ENABLE_UPDATE_REQUEST;//使能请求更新 uint16 desired_min_interval = DEFAULT_DESIRED_MIN_CONN_INTERVAL; //最小连接间隔0.1ms uint16 desired_max_interval = DEFAULT_DESIRED_MAX_CONN_INTERVAL; //最大连接间隔 1ms uint16 desired_slave_latency = DEFAULT_DESIRED_SLAVE_LATENCY;//0 uint16 desired_conn_timeout = DEFAULT_DESIRED_CONN_TIMEOUT;//10s,定义该参数表示在该时间段内建立的连接不成功
// Set the GAP Role Parameters GAPRole_SetParameter( GAPROLE_ADVERT_ENABLED, sizeof( uint8 ), &initial_advertising_enable ); GAPRole_SetParameter( GAPROLE_ADVERT_OFF_TIME, sizeof( uint16 ), &gapRole_AdvertOffTime );
GAPRole_SetParameter( GAPROLE_SCAN_RSP_DATA, sizeof ( scanRspData ), scanRspData );//当主机扫描到广播后会发出扫描请求，从机就发回该数据到主机 GAPRole_SetParameter( GAPROLE_ADVERT_DATA, sizeof( advertData ), advertData );//广播参数
GAPRole_SetParameter( GAPROLE_PARAM_UPDATE_ENABLE, sizeof( uint8 ), &enable_update_request ); GAPRole_SetParameter( GAPROLE_MIN_CONN_INTERVAL, sizeof( uint16 ), &desired_min_interval ); GAPRole_SetParameter( GAPROLE_MAX_CONN_INTERVAL, sizeof( uint16 ), &desired_max_interval ); GAPRole_SetParameter( GAPROLE_SLAVE_LATENCY, sizeof( uint16 ), &desired_slave_latency ); GAPRole_SetParameter( GAPROLE_TIMEOUT_MULTIPLIER, sizeof( uint16 ), &desired_conn_timeout ); }
// Set the GAP Characteristics, Set GAP GATT Server parameter GGS_SetParameter( GGS_DEVICE_NAME_ATT, GAP_DEVICE_NAME_LEN, attDeviceName );//GAP GATT服务器参数设置
// Set advertising interval { uint16 advInt = DEFAULT_ADVERTISING_INTERVAL;
GAP_SetParamValue( TGAP_LIM_DISC_ADV_INT_MIN, advInt ); GAP_SetParamValue( TGAP_LIM_DISC_ADV_INT_MAX, advInt ); GAP_SetParamValue( TGAP_GEN_DISC_ADV_INT_MIN, advInt ); GAP_SetParamValue( TGAP_GEN_DISC_ADV_INT_MAX, advInt ); }
// Setup the GAP Bond Manager //GAP 绑定管理器设置 { uint32 passkey = 0; // passkey "000000"，，密钥 uint8 pairMode = GAPBOND_PAIRING_MODE_WAIT_FOR_REQ;//配对模式，配置成等待主机的配对请求 uint8 mitm = TRUE; uint8 ioCap = GAPBOND_IO_CAP_DISPLAY_ONLY; uint8 bonding = TRUE; GAPBondMgr_SetParameter( GAPBOND_DEFAULT_PASSCODE, sizeof ( uint32 ), &passkey ); GAPBondMgr_SetParameter( GAPBOND_PAIRING_MODE, sizeof ( uint8 ), &pairMode ); GAPBondMgr_SetParameter( GAPBOND_MITM_PROTECTION, sizeof ( uint8 ), &mitm ); GAPBondMgr_SetParameter( GAPBOND_IO_CAPABILITIES, sizeof ( uint8 ), &ioCap ); GAPBondMgr_SetParameter( GAPBOND_BONDING_ENABLED, sizeof ( uint8 ), &bonding ); }
有我们特有的记忆，亲情之忆友谊之花爱情之树以及遗憾之泪！
