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 Android教程網 >> Android技術 >> 關於Android編程 >> Android BlueDroid(三):BlueDroid藍牙開啟過程enable

Android BlueDroid(三):BlueDroid藍牙開啟過程enable

編輯:關於Android編程

關鍵詞:bluedroid enableNative BTIF_TASK BTU_TASK bt_hc_work_thread set_power preload GKI
作者:xubin341719(歡迎轉載,請注明作者,請尊重版權,謝謝!)
繪圖工具:Edraw Maindmap
歡迎指正錯誤,共同學習、共同進步!!


一、enableNative函數的的實現
(1)、初始化BTE;
(2)、創建BTIU_TASK;
(3)、初始化HCI、串口相關,啟動HCI工作主線程:bt_hc_callback,芯片上電、RF參數初始化;
\

1、應用部分對enableNative函數的調用
packages\apps\Bluetooth\src\com\android\bluetooth\btservice\AdapterState.java

        public boolean processMessage(Message msg) {
            boolean isTurningOn= isTurningOn();
            boolean isTurningOff = isTurningOff();
………………
                case STARTED:   {
                    if (DBG) Log.d(TAG,"CURRENT_STATE=PENDING, MESSAGE = STARTED, isTurningOn=" + isTurningOn + ", isTurningOff=" + isTurningOff);
                    //Remove start timeout
                    removeMessages(START_TIMEOUT);

                    //Enable
                    boolean ret = adapterService.enableNative();
                    if (!ret) {
                        Log.e(TAG, "Error while turning Bluetooth On");
                        notifyAdapterStateChange(BluetoothAdapter.STATE_OFF);
                        transitionTo(mOffState);
                    } else {
                        sendMessageDelayed(ENABLE_TIMEOUT, ENABLE_TIMEOUT_DELAY);
                    }
                }
                    break;
………………
}
/*package*/ native boolean enableNative();

2、JNI函數的實現
packages\apps\Bluetooth\jni\com_android_bluetooth_btservice_AdapterService.cpp

static jboolean enableNative(JNIEnv* env, jobject obj) {
    ALOGV("%s:",__FUNCTION__);

    jboolean result = JNI_FALSE;
    if (!sBluetoothInterface) return result;

    int ret = sBluetoothInterface->enable();
    result = (ret == BT_STATUS_SUCCESS) ? JNI_TRUE : JNI_FALSE;//判斷是打開還是關閉狀態;
    return result;
}

3、C函數中對enable函數的實現,這部分和init的流程一樣
external\bluetooth\bluedroid\btif\src\bluetooth.c

static int enable( void )
{
    ALOGI("enable");

    /* sanity check */
    if (interface_ready() == FALSE)
        return BT_STATUS_NOT_READY;

    return btif_enable_bluetooth();
}

4、btif_enable_bluetooth函數的實現,Performschip power on and kickstarts OS scheduler
external\bluetooth\bluedroid\btif\src\btif_core.c|

bt_status_t btif_enable_bluetooth(void)
{
    BTIF_TRACE_DEBUG0("BTIF ENABLE BLUETOOTH");

    if (btif_core_state != BTIF_CORE_STATE_DISABLED)
    {
        ALOGD("not disabled\n");
        return BT_STATUS_DONE;
    }

    btif_core_state = BTIF_CORE_STATE_ENABLING;//設定為正在打開狀態;

    /* Create the GKI tasks and run them */
    bte_main_enable();

    return BT_STATUS_SUCCESS;
}

5、bte_main_enable函數,這個函數是enable函數的具體實現
BTEMAIN API - Creates all the BTE tasks. Should be called part of the Bluetooth stack enable sequence
iexternal\bluetooth\bluedroid\main\bte_main.c

void bte_main_enable()
{
    int ret = -1;

    APPL_TRACE_DEBUG1("%s", __FUNCTION__);

    /* Initialize BTE control block */
    BTE_Init();//(1)、初始化BTE控制塊;

    lpm_enabled = FALSE;
//(2)、創建BTU_TASK 進程
    GKI_create_task((TASKPTR)btu_task, BTU_TASK, BTE_BTU_TASK_STR,
                    (UINT16 *) ((UINT8 *)bte_btu_stack + BTE_BTU_STACK_SIZE),
                    sizeof(bte_btu_stack));
    bte_hci_enable();//(3)、打開HCI和廠商模塊控制;
    GKI_run(0);
    ret = bte_snoop_create_task();
    if(ret != 0)
        APPL_TRACE_DEBUG1("bte_snoop_create_task fail %d",ret);
}

(1)、初始化BTE控制塊

BTE_Init();
BTU:Bluetooth Upper Layer, The Broadcom implementations of L2CAP RFCOMM, SDP and the BTIf run as one GKI task. The btu_task switches between them.

(2)、創建BTU_TASK 進程

    GKI_create_task((TASKPTR)btu_task, BTU_TASK, BTE_BTU_TASK_STR,
                    (UINT16 *) ((UINT8 *)bte_btu_stack + BTE_BTU_STACK_SIZE),
                    sizeof(bte_btu_stack));

external\bluetooth\bluedroid\stack\btu\btu_task.c
This is the main task of the Bluetooth Upper Layers unit. It sits in aloop waiting for messages, and dispatches them to the appropiate handlers.
btu_task這個函數非常重要,大部分event的處理都通過它來完成;

BTU_API UINT32 btu_task (UINT32 param)
{
…………
    /* Initialize the mandatory core stack control blocks
       (BTU, BTM, L2CAP, and SDP)
     */
    btu_init_core();//1)、初始化核心control block,比如BTU, BTM, L2CAP, and SDP

    /* Initialize any optional stack components */
    BTE_InitStack();//2)、初始化BTE控制塊,比如RFCOMM, DUN, SPP, HSP2, HFP, OBX, BIP

#if (defined(BTU_BTA_INCLUDED) && BTU_BTA_INCLUDED == TRUE)
    bta_sys_init();//3)、初始化BTA
#endif
…………
    /* Wait for, and process, events */
    for (;;)//進入循環狀態
    {
        event = GKI_wait (0xFFFF, 0);//4)、獲取相應EVENT;

        if (event & TASK_MBOX_0_EVT_MASK)
        {…………}
        if (event & TIMER_0_EVT_MASK)
        {…………}

#if defined(QUICK_TIMER_TICKS_PER_SEC) && (QUICK_TIMER_TICKS_PER_SEC > 0)
        if (event & TIMER_2_EVT_MASK)
        {
            btu_process_quick_timer_evt();
        }
#endif
#if (defined(BTU_BTA_INCLUDED) && BTU_BTA_INCLUDED == TRUE)
        if (event & TASK_MBOX_2_EVT_MASK)//這個狀態比較重要
        {
            while ((p_msg = (BT_HDR *) GKI_read_mbox(TASK_MBOX_2)) != NULL)
            {
                bta_sys_event(p_msg);//接收到的event在這裡解析,然後執行BTU中的函數。
            }
        }

        if (event & TIMER_1_EVT_MASK)
        {
            bta_sys_timer_update();
        }
#endif

        if (event & EVENT_MASK(APPL_EVT_7))
            break;
    }
    return(0);
}

(3)、bte_hci_enable,Enable HCI & Vendor modules,打開HCI和廠商模塊
bte_hci_enable的實現流程如下圖所示
\

external\bluetooth\bluedroid\main\bte_main.c

static void bte_hci_enable(void)
{
    APPL_TRACE_DEBUG1("%s", __FUNCTION__);

    preload_start_wait_timer();

    if (bt_hc_if)
    {
        int result = bt_hc_if->init(&hc_callbacks, btif_local_bd_addr.address);//初始化串口,HCI_H4、HCI工作線等;
………………
        bt_hc_if->set_power(BT_HC_CHIP_PWR_ON);//給相應模塊上電;
        bt_hc_if->preload(NULL);//下載相關配置參數;
        if (hci_logging_enabled == TRUE || hci_logging_config == TRUE)
            bt_hc_if->logging(BT_HC_LOGGING_ON, hci_logfile);
    }
}

6、相對於HCI接口庫接口函數,這部分跟藍牙芯片相關
external\bluetooth\bluedroid\hci\src\bt_hci_bdroid.c

static const bt_hc_interface_t bluetoothHCLibInterface = {
    sizeof(bt_hc_interface_t),
    init,//HCLib中的init;
    set_power,// HCLib中的power設定;
    lpm,
    preload, HCLib中的preload;
    postload,
    transmit_buf,
    set_rxflow,
    logging,
    cleanup
};

7、bluetoothHCLibInterface 中INIT實現過程
完成H4初始化、串口驅動初始化、LMP初始化、啟動bt_hc_worker_thread主線程。
\

(1)、init函數實現
external\bluetooth\bluedroid\hci\src\bt_hci_bdroid.c

static int init(const bt_hc_callbacks_t* p_cb, unsigned char *local_bdaddr)
{
…………
    /* store reference to user callbacks */
    bt_hc_cbacks = (bt_hc_callbacks_t *) p_cb;

    init_vnd_if(local_bdaddr);//完成廠商模塊的接口函數;    
userial_init();//串口初始化
    lpm_init();//LPM初始化
…………
extern tHCI_IF hci_h4_func_table;// 應用HCI H4接口回調
    p_hci_if = &hci_h4_func_table;
    p_hci_if->init();//調用hci_h4_func_table的init辦法,初始化H4模塊
    utils_queue_init(&tx_q); //初始化發送隊列
…………
    if (pthread_create(&hc_cb.worker_thread, &thread_attr, \
                       bt_hc_worker_thread, NULL) != 0) //起工作線程
    {
        ALOGE("pthread_create failed!");
        lib_running = 0;
        return BT_HC_STATUS_FAIL;
    }
…………
}

1)、bt_hc_callbacks_t*bt_hc_cbacks = (bt_hc_callbacks_t *) p_cb; //保存回調;
2)、init_vnd_if(local_bdaddr);//調用廠商庫裡面的bt_vendor_interface_t*接口,初始化藍牙設備;
3)、p_hci_if =&hci_h4_func_table; //應用HCI H4接口回調;
4)、p_hci_if->init(); //調用hci_h4_func_table的init辦法,初始化H4模塊;
5)、userial_init();//初始化uart數據布局;
6)、lpm_init();//初始化低功耗模塊,調用bt_vendor_interface_t的op接口;
7)、utils_queue_init(&tx_q); //初始化發送隊列;
8)、pthread_create(&hc_cb.worker_thread,&thread_attr, bt_hc_worker_thread, NULL) != 0) //起工作線程;

(2)、init_vnd_if 的實現過程
idh.code\external\bluetooth\bluedroid\hci\src\bt_hw.c

\

void init_vnd_if(unsigned char *local_bdaddr)
{
    void *dlhandle;

dlhandle = dlopen("libbt-vendor.so", RTLD_NOW);// 1)、dlopen()函數以指定模式打開指定的動態鏈接庫文件,並返回一個句柄給dlsym()的調用進程。
………………
    bt_vnd_if = (bt_vendor_interface_t *) dlsym(dlhandle, "BLUETOOTH_VENDOR_LIB_INTERFACE");//2)、返回符號BLUETOOTH_VENDOR_LIB_INTERFACE,所對應的地址。
…………
    bt_vnd_if->init(&vnd_callbacks, local_bdaddr);//3)、調用返回地址結構體中的init函數;
}

1)、dlopen()
函數以指定模式打開指定的動態鏈接庫文件,並返回一個句柄給dlsym()的調用進程。

dlhandle = dlopen("libbt-vendor.so", RTLD_NOW);
void * dlopen( const char * pathname, int mode);
mode是打開方式,其值有多個,不同操作系統上實現的功能有所不同,在linux下,按功能可分為三類:

解析方式

RTLD_LAZY:

在dlopen返回前,對於動態庫中的未定義的符號不執行解析(只對函數引用有效,對於變量引用總是立即解析)。

RTLD_NOW:

需要在dlopen返回前,解析出所有未定義符號,如果解析不出來,在dlopen會返回NULL,錯誤為:: undefined symbol: xxxx.......

作用范圍,可與解析方式通過“|”組合使用。

RTLD_GLOBAL:

動態庫中定義的符號可被其後打開的其它庫重定位。

RTLD_LOCAL:

與RTLD_GLOBAL作用相反,動態庫中定義的符號不能被其後打開的其它庫重定位。如果沒有指明是RTLD_GLOBAL還是RTLD_LOCAL,則缺省為RTLD_LOCAL。

作用方式

RTLD_NODELETE:

在dlclose()期間不卸載庫,並且在以後使用dlopen()重新加載庫時不初始化庫中的靜態變量。這個flag不是POSIX-2001標准。

RTLD_NOLOAD:

不加載庫。可用於測試庫是否已加載(dlopen()返回NULL說明未加載,否則說明已加載),也可用於改變已加載庫的flag,如:先前加載庫的flag為RTLD_LOCAL,用dlopen(RTLD_NOLOAD|RTLD_GLOBAL)後flag將變成RTLD_GLOBAL。這個flag不是POSIX-2001標准。

RTLD_DEEPBIND:

在搜索全局符號前先搜索庫內的符號,避免同名符號的沖突。這個flag不是POSIX-2001標准。

2)、dlsym根據動態鏈接庫操作句柄與符號,返回符號對應的地址
返回符號BLUETOOTH_VENDOR_LIB_INTERFACE,所對應的地址,也就是:

const bt_vendor_interface_t BLUETOOTH_VENDOR_LIB_INTERFACE = {
    sizeof(bt_vendor_interface_t),
    init,
    op,
    cleanup
};

3)、調用返回地址結構體中的init函數
bt_vnd_if->init(&vnd_callbacks,local_bdaddr);
有兩個參數:廠商提供的回調函數vnd_callbacks;藍牙地址:local_badaddr。
函數init的實現:
vendor\sprd\open-source\libs\libbt\src\bt_vendor_sprd.c

const bt_vendor_interface_t BLUETOOTH_VENDOR_LIB_INTERFACE = {
    sizeof(bt_vendor_interface_t),
    init,
    op,
    cleanup
};

BLUETOOTH_VENDOR_LIB_INTERFACE中INIT函數實現
vendor\sprd\open-source\libs\libbt\src\bt_vendor_sprd.c

static int init(const bt_vendor_callbacks_t* p_cb, unsigned char *local_bdaddr)
{
…………
    /* store reference to user callbacks */
    bt_vendor_cbacks = (bt_vendor_callbacks_t *) p_cb;//把vnd_callbacks回調函數,保存到用戶回調bt_vendor_cback;
…………
}

vnd_callbacks,這些函數在
//The libbt-vendor Callback Functions Table

static const bt_vendor_callbacks_t vnd_callbacks = {
    sizeof(bt_vendor_callbacks_t),
    fwcfg_cb,
    scocfg_cb,
    lpm_vnd_cb,
    alloc,
    dealloc,
    xmit_cb,
    epilog_cb
};

(3)、hci_h4_func_tableinit函數的初始化

extern tHCI_IF hci_h4_func_table;
p_hci_if = &hci_h4_func_table; 
p_hci_if->init();
1)、hci_h4_func_table結構體成員函數
const tHCI_IF hci_h4_func_table =
{
    hci_h4_init,
    hci_h4_cleanup,
    hci_h4_send_msg,//發送msg;
    hci_h4_send_int_cmd,//發送int命令;
    hci_h4_get_acl_data_length,
    hci_h4_receive_msg//接收信息;
};

2)、 p_hci_if->init();調用hci_h4_func_table的init辦法,初始化H4模塊,對應實現函數對應:hci_h4_init

void hci_h4_init(void)
{
    HCIDBG("hci_h4_init");
    memset(&h4_cb, 0, sizeof(tHCI_H4_CB));
    utils_queue_init(&(h4_cb.acl_rx_q));

    /* Per HCI spec., always starts with 1 */
    num_hci_cmd_pkts = 1;

    /* Give an initial values of Host Controller's ACL data packet length
     * Will update with an internal HCI(_LE)_Read_Buffer_Size request
     */
    h4_cb.hc_acl_data_size = 1021;//hci ACL 數據的最大長度;
    h4_cb.hc_ble_acl_data_size = 27;//BLE  ACL最大數據長度;

    btsnoop_init();
}

(4)、初始化串口、LPM
userial_init();
lpm_init();
(5)、創建工作線程
if(pthread_create(&hc_cb.worker_thread, &thread_attr, \
bt_hc_worker_thread, NULL) != 0)
idh.code\external\bluetooth\bluedroid\hci\src\bt_hci_bdroid.c
bt_hc_worker_thread工作線程,監聽各種狀態,處理相對應。

static void *bt_hc_worker_thread(void *arg)
{
…………
        if (events & HC_EVENT_PRELOAD)
        {
            userial_open(USERIAL_PORT_1);
…………
                bt_vnd_if->op(BT_VND_OP_FW_CFG, NULL);
  	…………
        }

        if (events & HC_EVENT_POSTLOAD)

    …………

        if (events & HC_EVENT_TX)
       …………
        if (events & HC_EVENT_LPM_ENABLE)
   ………………
}

8、bluetoothHCLibInterface中set_power流程
這部分主要完成上電操作,SPRD的藍牙芯片集成到AP端,由芯片內部控制。如果用其他藍牙WIFI芯片,這部分應該對應相關power PIN腳操作。

\

idh.code\external\bluetooth\bluedroid\hci\src\bt_hci_bdroid.c

/** Chip power control */
static void set_power(bt_hc_chip_power_state_t state)
{
    int pwr_state;
…………
    pwr_state = (state == BT_HC_CHIP_PWR_ON) ? BT_VND_PWR_ON : BT_VND_PWR_OFF;

    if (bt_vnd_if)
        bt_vnd_if->op(BT_VND_OP_POWER_CTRL, &pwr_state);//設置controller  POWER ON/OFF
…………
}

bt_vnd_if這個結構體在idh.code\external\bluetooth\bluedroid\hci\include\bt_vendor_lib.h中定義,相對應的op函數在bt_vendor_sprd.c中實現。
(1)、bt_vnd_if結構體:

typedef struct {
    size_t          size;
    int   (*init)(const bt_vendor_callbacks_t* p_cb, unsigned char *local_bdaddr);
    int (*op)(bt_vendor_opcode_t opcode, void *param);
    void  (*cleanup)(void);
} bt_vendor_interface_t;

(2)、bt_vnd_if->op的函數實現
vendor\sprd\open-source\libs\libbt\src\bt_vendor_sprd.c
相對應不同op操作

BT_VND_OP_POWER_CTRL

Power on or off the BT Controller

BT_VND_OP_FW_CFG

Perform any vendor specific initialization or configuration on the BT Controller. This is called before stack initialization

BT_VND_OP_SCO_CFG

Perform any vendor specific SCO/PCM configuration on the BT Controller.This is called after stack initialization.

BT_VND_OP_USERIAL_OPEN

Open UART port on where the BT Controller is attached. This is called before stack initialization.

BT_VND_OP_USERIAL_CLOSE

Close the previously opened UART port.

BT_VND_OP_GET_LPM_IDLE_TIMEOUT

Get the LPM idle timeout in milliseconds.The stack uses this information to launch a timer delay before it attempts to de-assert LPM WAKE signal once downstream HCI packet has been delivered.

BT_VND_OP_LPM_SET_MODE

Enable or disable LPM mode on BT Controller.

BT_VND_OP_LPM_WAKE_SET_STATE

Assert or Deassert LPM WAKE on BT Controller.

BT_VND_OP_EPILOG

The epilog call to the vendor module so that it can perform any vendor-specific processes (e.g. send a HCI_RESET to BT Controller)before the caller calls for cleanup().

static int op(bt_vendor_opcode_t opcode, void *param)
{
…………
    switch(opcode)
    {
        case BT_VND_OP_POWER_CTRL://如果是power控制
            {
		 ALOGI("bt-vendor : BT_VND_OP_POWER_CTRL");		
		  #if 0//這部分代碼展訊平台沒有控制;
		  nState = *(int *) param;
                retval = hw_config(nState);
                if(nState == BT_VND_PWR_ON
                   && retval == 0
                   && is_hw_ready() == TRUE)
                {
                    retval = 0;
                }
		  #endif			
            }
            break;
   …………
}

9、bluetoothHCLibInterface中Preload流程
這部分主要完成藍牙MAC地址、RF射頻相關設定,流程如下所示。
\


(1)、發送HC_EVENT_POSTLOAD 信令,線程bt_hc_worker_thread接收並處理
external\bluetooth\bluedroid\hci\src\bt_hci_bdroid.c

/** Called post stack initialization */
static void postload(TRANSAC transac)
{
    BTHCDBG("postload");
    bthc_signal_event(HC_EVENT_POSTLOAD);//發送信號量給線程bt_hc_worker_thread
}

10、bt_hc_worker_thread處理HC_EVENT_PRELOAD

static void *bt_hc_worker_thread(void *arg)
{
    uint16_t events;
HC_BT_HDR *p_msg, *p_next_msg;
…………
        if (events & HC_EVENT_PRELOAD)
        {
            userial_open(USERIAL_PORT_1);//打開串口;
            /* Calling vendor-specific part */
            if (bt_vnd_if)
            {
                bt_vnd_if->op(BT_VND_OP_FW_CFG, NULL);//(1)、mac、ini、pskey初始化
            }
            else
            {
                if (bt_hc_cbacks)
                    bt_hc_cbacks->preload_cb(NULL, BT_HC_PRELOAD_FAIL);(2)、失敗preload 回調函數            
…………
}

11、bt_vnd_if->op(BT_VND_OP_FW_CFG, NULL);調用
vendor\sprd\open-source\libs\libbt\src\bt_vendor_sprd.c中的OP函數:

static int op(bt_vendor_opcode_t opcode, void *param)
{
…………
               case BT_VND_OP_FW_CFG:
            {
                    ALOGI("bt-vendor : BT_VND_OP_FW_CFG");
                    retval = sprd_config_init(s_bt_fd,NULL,NULL);//初始化展訊平台
                    ALOGI("bt-vendor : sprd_config_init retval = %d.",retval);
                    if(bt_vendor_cbacks)
                    {
                        if(retval == 0)
                        {
                            ALOGI("Bluetooth Firmware and smd is initialized");
                       bt_vendor_cbacks->fwcfg_cb(BT_VND_OP_RESULT_SUCCESS);//初始化成功後回調函數
                        }
                        else
                        {
                            ALOGE("Error : hci, smd initialization Error");
                            bt_vendor_cbacks->fwcfg_cb(BT_VND_OP_RESULT_FAIL);
                        }
                    }
            }
            break;	
}

(1)、sprd_config_init的實現
這部分針對芯片部分,展訊的藍牙芯片處理流程,在這裡完成:藍牙MAC地址、RF ini文件相關;
vendor\sprd\open-source\libs\libbt\src\ bt_vendor_sprd.c中sprd_config_init

//******************create bt addr end***********************
int sprd_config_init(int fd, char *bdaddr, struct termios *ti)
{
………………
    if(access(BT_MAC_FILE, F_OK) == 0)// MAC地址創建如果btmac不存在,隨機生成;
    {
        ALOGI("%s: %s exists",__FUNCTION__, BT_MAC_FILE);
        read_btmac=read_mac_from_file(BT_MAC_FILE,bt_mac);
    }
    if(read_btmac == 1)
    {
        for(i=0; i<6; i++)
        {
            bt_mac_tmp[i*2] = bt_mac[3*(5-i)];
            bt_mac_tmp[i*2+1] = bt_mac[3*(5-i)+1];
        }
        ALOGI("====bt_mac_tmp=%s", bt_mac_tmp);
        ConvertHexToBin((uint8*)bt_mac_tmp, strlen(bt_mac_tmp), bt_mac_bin);
    }
    /* Reset the BT Chip */
    memset(resp, 0, sizeof(resp));
    ret = bt_getPskeyFromFile(&bt_para_tmp);//1)、GETPSKEY FOROMFILE,這裡完成INI文件的初始化
 …………
    {
        ALOGI("get_pskey_from_file ok \n");
        /* Send command from pskey_bt.txt*/
        if(read_btmac == 1)
        {
            memcpy(bt_para_tmp.device_addr, bt_mac_bin, sizeof(bt_para_tmp.device_addr));
        }
        if (write(s_bt_fd, (char *)&bt_para_tmp, sizeof(BT_PSKEY_CONFIG_T)) != sizeof(BT_PSKEY_CONFIG_T)) 
        {
            ALOGI("Failed to write pskey command from pskey file\n");
            return -1;
        }
    }
    ALOGI("sprd_config_init write pskey command ok \n");
    while (1) 
    {
        r = read(s_bt_fd, resp, 1);
        if (r <= 0)
        return -1;
        if (resp[0] == 0x05)
        {
            ALOGI("read pskey response ok \n");
            break;
        }
    }
    ALOGI("sprd_config_init ok \n");
    return 0;
}
1)、GETPSKEY FOROMFILE,這裡完成INI文件的初始化:這部分內容和芯片相關, 不同廠商的芯片有不同的處理方法;

++++++sprd start 其他平台可以不看+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
vendor\sprd\open-source\libs\libbt\src\bt_vendor_sprd.c

int bt_getPskeyFromFile(void *pData)
{
…………
#ifdef HW_ADC_ADAPT_SUPPORT//不同INI文件
    char *CFG_2351_PATH[] = {
        "/system/etc/connectivity_configure_hw100.ini",
        "/system/etc/connectivity_configure_hw102.ini",
        "/system/etc/connectivity_configure_hw104.ini"
    };
#else
    char *CFG_2351_PATH[] = {
        "/system/etc/connectivity_configure.ini"
    };
#endif
#ifdef HW_ADC_ADAPT_SUPPORT
//如果是不同的硬件,獲取板子信息,給board_type賦值,後面選擇用那個ini文件。這個是展訊平台相關,不同平台有不同的做法;
    char *BOARD_TYPE_PATH = "/dev/board_type";
    int fd_board_type;
    char board_type_str[MAX_BOARD_TYPE_LEN] = {0};
    fd_board_type = open(BOARD_TYPE_PATH, O_RDONLY);//(1)、獲取硬件版本信息
    if (fd_board_type<0)
    {
        ALOGI("#### %s file open %s err ####\n", __FUNCTION__, BOARD_TYPE_PATH);
        board_type = 2; // default is 1.0.4
    }
    else
    {
        len = read(fd_board_type, board_type_str, MAX_BOARD_TYPE_LEN);
        if (strstr(board_type_str, "1.0.0"))
        {
            board_type = 0;
        }
 …………
#endif
    ALOGI("begin to bt_getPskeyFromFile");  
    fd = open(CFG_2351_PATH[board_type], O_RDONLY, 0644);
    if(-1 != fd)
    {
        len = bt_getFileSize(CFG_2351_PATH[board_type]);//(2)、獲得相應的版本的PSKEY;
        pBuf = (unsigned char *)malloc(len);
        ret = read(fd, pBuf, len);
     …………
    ret = bt_getDataFromBuf(pData, pBuf, len);
    if(-1 == ret)
    {
        free(pBuf);
        return -1;
    }
    ALOGI("begin to dumpPskey");
    bt_dumpPskey((BT_PSKEY_CONFIG_T *)pData);//(3)、解析相應數據
    free(pBuf);
    return 0;
}

獲取硬件版本信息
fd_board_type = open(BOARD_TYPE_PATH,O_RDONLY);
Board_type如下圖:
\
獲得相應的版本的PSKEY;<喎?/kf/ware/vc/" target="_blank" class="keylink">vcD48cHJlIGNsYXNzPQ=="brush:java;">char *CFG_2351_PATH[] = { "/system/etc/connectivity_configure_hw100.ini", "/system/etc/connectivity_configure_hw102.ini", "/system/etc/connectivity_configure_hw104.ini" };

\
解析相應數據
bt_dumpPskey((BT_PSKEY_CONFIG_T*)pData);

++++++++++++++sprd end 其他平台可以不看+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
12、 配置成功後回調函數fwcfg_cb
\

bt_vendor_cbacks->fwcfg_cb(BT_VND_OP_RESULT_SUCCESS);//初始化成功後回調函數,這部分在case BT_VND_OP_FW_CFG中完成

external\bluetooth\bluedroid\hci\src\bt_hw.c

static void fwcfg_cb(bt_vendor_op_result_tresult)
{
    bt_hc_postload_result_tstatus = (result == BT_VND_OP_RESULT_SUCCESS) ? \
                                    BT_HC_PRELOAD_SUCCESS : BT_HC_PRELOAD_FAIL;//判定prelaod是否成功;
    fwcfg_acked = TRUE;
    if (bt_hc_cbacks)
        bt_hc_cbacks->preload_cb(NULL, status);//對應preload_cb
}

preload_cb的實現,把BT_EVT_PRELOAD_CMPL成功消息通過GKI返回BTU_TASK;

external\bluetooth\bluedroid\main\bte_main.c
static void preload_cb(TRANSACtransac, bt_hc_preload_result_t result)
{
    APPL_TRACE_EVENT1("HC preload_cb %d[0:SUCCESS 1:FAIL]", result);
    if (result == BT_HC_PRELOAD_SUCCESS)
    {
        preload_stop_wait_timer();
        /* notify BTU task that libbt-hci isready */
        GKI_send_event(BTU_TASK, BT_EVT_PRELOAD_CMPL);//發送BT_EVT_PRELOAD_CMPL到BTU_TASK
    }
}

preload完成後,回調函數返回到BTU_TASK,啟動BT其他協議層的初始化。
下節我們分析:
1、GKI_send_msg進程間通信如何完成;
2、bta_sys_sendmsg event如何解析;
3、GKI_Wait實現流程;

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