CH571,CH573,CH582,CH592低功耗蓝牙定向广播/白名单广播回连

以CH582的Hid_Keyboard例程为例，

1、CH582首次广播面向对象为所有扫描设备，例程默认就是这种广播方式；

2、我们主机设备与CH582建立配对之后，可以利用hidDevPairStateCB回调添加代码找到我们主机设备的地址信息（remote_addr）以及地址类型（addr_type）；

/*这里自定义了一个结构体，以便后面赋值使用*/
typedef struct
{
    bool isbond;
    uint8_t remote_addr_type;
    uint8_t remote_addr[6];
}Device_ID_t;

 

/*该回调函数在hiddev.c文件中*/

static void hidDevPairStateCB(uint16_t connHandle, uint8_t state, uint8_t status)
{
    if(state == GAPBOND_PAIRING_STATE_COMPLETE)
    {
        if(status == SUCCESS)
        {
            hidDevConnSecure = TRUE;
        }
        pairingStatus = status;
    }
    else if(state == GAPBOND_PAIRING_STATE_BONDED)
    {
        if(status == SUCCESS)
        {
            hidDevConnSecure = TRUE;

#if DEFAULT_SCAN_PARAM_NOTIFY_TEST == TRUE
            ScanParam_RefreshNotify(gapConnHandle);
#endif
        }
    }
    else if(state == GAPBOND_PAIRING_STATE_BOND_SAVED)
    {
/******************************添加代码***************************************/
        gapBondRec_t bond_info;
        uint8_t addr_type;

        tmos_snv_read(mainRecordNvID(0), sizeof(gapBondRec_t), &bond_info);
        PRINT("identity addr (");
        for(int i = 0 ; i < 6; i ++) 
        {
            PRINT("%#x ", bond_info.publicAddr[i]);
        }
        PRINT(")\n");
        
        tmos_memcpy(mydevinfo.remote_addr,bond_info.publicAddr, 6);//将此次绑定的地址赋值到自己定义的地址数组中去，以便定向广播或者白名单回连使用
        //为identity address， 可能为public address,也可能是random static address
        if( (bond_info.publicAddr[5] & 0xC0) == 0x80 ) {
            addr_type = 0;
        } else {
            addr_type = 1;
        }
        extern uint8_t devAddrType;
        (devAddrType)?1:(addr_type = 0);

        if(devAddrType == 3)
            addr_type |= devAddrType<<4;
        
        mydevinfo.remote_addr_type = addr_type;//获取主机的地址类型
        mydevinfo.isbond = 1;//此次设备绑定生效
/*****************************END*************************************/
    }
}

3、将上次绑定的设备地址(remote_addr)和地址类型(addr_type)传入定向广播的参数中;

static inline void bt_adv_direct(uint8_t addr_type, uint8_t *addr)
{
    uint8_t adv_event_type;
    adv_event_type = GAP_ADTYPE_ADV_HDC_DIRECT_IND;


    uint8_t Adv_Direct_Addr[B_ADDR_LEN];
    uint8_t Adv_Direct_Type = addr_type;

    tmos_memcpy(Adv_Direct_Addr, addr,sizeof(Adv_Direct_Addr));

    PRINT("Adv Direct type %#x (", Adv_Direct_Type);
    for (int i = 0; i < 6; i++) {
        if(i) PRINT(" ");
        PRINT("%#x", Adv_Direct_Addr[i]);
    }
    PRINT(")\n");
    GAPRole_SetParameter( GAPROLE_ADV_DIRECT_ADDR, sizeof(Adv_Direct_Addr),Adv_Direct_Addr);
    GAPRole_SetParameter( GAPROLE_ADV_DIRECT_TYPE, sizeof(Adv_Direct_Type),&Adv_Direct_Type);
    GAPRole_SetParameter( GAPROLE_ADV_EVENT_TYPE, sizeof(adv_event_type),&adv_event_type);
}

4、利用结构体中的是否绑定参数(mydevinfo.isbond)做判断，每次上电广播时是否进行定向广播；

void adv_init(void)
{
    uint8_t initial_advertising_enable = TRUE;
    if (mydevinfo.isbond) {
        PRINT("type = %d\n",mydevinfo.remote_addr_type);
        uint8_t enable = ENABLE;
        if(mydevinfo.remote_addr_type&0x30){
            GAPBondMgr_SetParameter( GAPBOND_AUTO_SYNC_RL, sizeof(uint8), &enable);
        }
        else{
            enable = DISABLE;
            GAPBondMgr_SetParameter( GAPBOND_AUTO_SYNC_RL, sizeof(uint8), &enable);
        }
        bt_adv_direct(mydevinfo.remote_addr_type, mydevinfo.remote_addr);
    }
    else{
        GAPRole_SetParameter( GAPROLE_ADVERT_DATA, sizeof(advertData), advertData);
        GAPRole_SetParameter( GAPROLE_SCAN_RSP_DATA, sizeof(scanRspData),
                scanRspData);
    }
    // Set the GAP Role Parameters
    GAPRole_SetParameter(GAPROLE_ADVERT_ENABLED, sizeof(uint8_t), &initial_advertising_enable);
}

5、定向广播为1.28s进行一次快速广播，且部分苹果手机和华为手机无法利用该方式回连，可借助下面的白名单回连的方式；

void adv_init(void)
{
    uint8_t initial_advertising_enable = TRUE;

    uint16 advInt =32; //0.625us * 32 = 20ms,20ms一包广播包
    GAP_SetParamValue(TGAP_DISC_ADV_INT_MIN, advInt);
    GAP_SetParamValue(TGAP_DISC_ADV_INT_MAX, advInt);

    if(mydevinfo.isbond)
    {
        uint8 syncWL = TRUE;
        GAPBondMgr_SetParameter( GAPBOND_AUTO_SYNC_RL, sizeof( uint8 ), &syncWL );
        uint8 filter_policy = GAP_FILTER_POLICY_WHITE;      //只允许白名单设备扫描和连接
        GAPRole_SetParameter( GAPROLE_ADV_FILTER_POLICY, sizeof( uint8 ), &filter_policy );//设置白名单
    }else {
        uint8_t policy = GAP_FILTER_POLICY_ALL;
        GAPRole_SetParameter(GAPROLE_ADV_FILTER_POLICY, sizeof(policy), &policy);
    }
}