关键词:bluedroid enableNative BTIF_TASK BTU_TASK bt_hc_work_thread set_power preload GKI
作者:xubin341719(欢迎转载,请注明作者,请尊重版权,谢谢!)
绘图工具:Edraw Maindmap
欢迎指正错误,共同学习、共同进步!!
一、enableNative函数的的实现
(1)、初始化BTE;
(2)、创建BTIU_TASK;
(3)、初始化HCI、串口相关,启动HCI工作主线程:bt_hc_callback,芯片上电、RF参数初始化;
1、应用部分对enableNative函数的调用
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();//调用Native函数; 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函数的实现
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();//JNI部分Native函数调用C语言中的函数实现; result = (ret == BT_STATUS_SUCCESS) ? JNI_TRUE : JNI_FALSE;//判断是打开还是关闭状态; return result; }
3、C函数中对enable函数的实现,这部分和init的流程一样
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();//enable汗的具体实现; }
4、btif_enable_bluetooth函数的实现,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;//设定为正在打开状态; /* Create the GKI tasks and run them */ bte_main_enable();//BTE部分的enable return BT_STATUS_SUCCESS; }
5、bte_main_enable函数,这个函数是enable函数的具体实现
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控制块; lpm_enabled = FALSE; //(2)、创建BTU_TASK 进程 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)、打开HCI和厂商模块控制; GKI_run(0); ret = bte_snoop_create_task();//BT log 进程创建; if(ret != 0) APPL_TRACE_DEBUG1("bte_snoop_create_task fail %d",ret); }
(1)、初始化BTE控制块
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)、创建BTU_TASK 进程
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这个函数非常重要,大部分event的处理都通过它来完成;
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控制块,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 (;;)//进入循环状态 { event = GKI_wait (0xFFFF, 0);//4)、获取相应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)//这个状态比较重要 { while ((p_msg = (BT_HDR *) GKI_read_mbox(TASK_MBOX_2)) != NULL) { bta_sys_event(p_msg);//接收到的event在这里解析,然后执行BTU中的函数。 } } 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,打开HCI和厂商模块
bte_hci_enable的实现流程如下图所示
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工作线等; ……………… bt_hc_if->set_power(BT_HC_CHIP_PWR_ON);//给相应模块上电; bt_hc_if->preload(NULL);//下载相关配置参数; if (hci_logging_enabled == TRUE || hci_logging_config == TRUE) bt_hc_if->logging(BT_HC_LOGGING_ON, hci_logfile); } }
6、相对于HCI接口库接口函数,这部分跟蓝牙芯片相关
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设定; lpm, preload, HCLib中的preload; postload, transmit_buf, set_rxflow, logging, cleanup };
7、bluetoothHCLibInterface 中INIT实现过程
完成H4初始化、串口驱动初始化、LMP初始化、启动bt_hc_worker_thread主线程。
(1)、init函数实现
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);//完成厂商模块的接口函数; userial_init();//串口初始化 lpm_init();//LPM初始化 ………… extern tHCI_IF hci_h4_func_table;// 应用HCI H4接口回调 p_hci_if = &hci_h4_func_table; p_hci_if->init();//调用hci_h4_func_table的init办法,初始化H4模块 utils_queue_init(&tx_q); //初始化发送队列 ………… if (pthread_create(&hc_cb.worker_thread, &thread_attr, \ bt_hc_worker_thread, NULL) != 0) //起工作线程 { 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; //保存回调;
2)、init_vnd_if(local_bdaddr);//调用厂商库里面的bt_vendor_interface_t*接口,初始化蓝牙设备;
3)、p_hci_if =&hci_h4_func_table; //应用HCI H4接口回调;
4)、p_hci_if->init(); //调用hci_h4_func_table的init办法,初始化H4模块;
5)、userial_init();//初始化uart数据布局;
6)、lpm_init();//初始化低功耗模块,调用bt_vendor_interface_t的op接口;
7)、utils_queue_init(&tx_q); //初始化发送队列;
8)、pthread_create(&hc_cb.worker_thread,&thread_attr, bt_hc_worker_thread, NULL) != 0) //起工作线程;
(2)、init_vnd_if 的实现过程
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()函数以指定模式打开指定的动态链接库文件,并返回一个句柄给dlsym()的调用进程。 ……………… bt_vnd_if = (bt_vendor_interface_t *) dlsym(dlhandle, "BLUETOOTH_VENDOR_LIB_INTERFACE");//2)、返回符号BLUETOOTH_VENDOR_LIB_INTERFACE,所对应的地址。 ………… bt_vnd_if->init(&vnd_callbacks, local_bdaddr);//3)、调用返回地址结构体中的init函数; }
1)、dlopen()
函数以指定模式打开指定的动态链接库文件,并返回一个句柄给dlsym()的调用进程。
dlhandle = dlopen("libbt-vendor.so", RTLD_NOW); void * dlopen( const char * pathname, int mode); mode是打开方式,其值有多个,不同操作系统上实现的功能有所不同,在linux下,按功能可分为三类:
解析方式
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RTLD_LAZY: |
在dlopen返回前,对于动态库中的未定义的符号不执行解析(只对函数引用有效,对于变量引用总是立即解析)。
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RTLD_NOW: |
需要在dlopen返回前,解析出所有未定义符号,如果解析不出来,在dlopen会返回NULL,错误为:: undefined symbol: xxxx.......
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作用范围,可与解析方式通过“|”组合使用。
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RTLD_GLOBAL: |
动态库中定义的符号可被其后打开的其它库重定位。
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RTLD_LOCAL: |
与RTLD_GLOBAL作用相反,动态库中定义的符号不能被其后打开的其它库重定位。如果没有指明是RTLD_GLOBAL还是RTLD_LOCAL,则缺省为RTLD_LOCAL。
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作用方式
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RTLD_NODELETE: |
在dlclose()期间不卸载库,并且在以后使用dlopen()重新加载库时不初始化库中的静态变量。这个flag不是POSIX-2001标准。
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RTLD_NOLOAD: |
不加载库。可用于测试库是否已加载(dlopen()返回NULL说明未加载,否则说明已加载),也可用于改变已加载库的flag,如:先前加载库的flag为RTLD_LOCAL,用dlopen(RTLD_NOLOAD|RTLD_GLOBAL)后flag将变成RTLD_GLOBAL。这个flag不是POSIX-2001标准。
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RTLD_DEEPBIND: |
在搜索全局符号前先搜索库内的符号,避免同名符号的冲突。这个flag不是POSIX-2001标准。
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2)、dlsym根据动态链接库操作句柄与符号,返回符号对应的地址
返回符号BLUETOOTH_VENDOR_LIB_INTERFACE,所对应的地址,也就是:
const bt_vendor_interface_t BLUETOOTH_VENDOR_LIB_INTERFACE = { sizeof(bt_vendor_interface_t), init, op, cleanup };
3)、调用返回地址结构体中的init函数
bt_vnd_if->init(&vnd_callbacks,local_bdaddr);
有两个参数:厂商提供的回调函数vnd_callbacks;蓝牙地址:local_badaddr。
函数init的实现:
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函数实现
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回调函数,保存到用户回调bt_vendor_cback; ………… }
vnd_callbacks,这些函数在
//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_table中init函数的初始化
extern tHCI_IF hci_h4_func_table; p_hci_if = &hci_h4_func_table; p_hci_if->init();1)、hci_h4_func_table结构体成员函数
const tHCI_IF hci_h4_func_table = { hci_h4_init,//HCI_H4初始化; hci_h4_cleanup, hci_h4_send_msg,//发送msg; hci_h4_send_int_cmd,//发送int命令; hci_h4_get_acl_data_length, hci_h4_receive_msg//接收信息; };
2)、 p_hci_if->init();调用hci_h4_func_table的init办法,初始化H4模块,对应实现函数对应: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 数据的最大长度;
h4_cb.hc_ble_acl_data_size = 27;//BLE ACL最大数据长度;
btsnoop_init();
}
(4)、初始化串口、LPM
userial_init();
lpm_init();
(5)、创建工作线程
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工作线程,监听各种状态,处理相对应。
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
这部分主要完成上电操作,SPRD的蓝牙芯片集成到AP端,由芯片内部控制。如果用其他蓝牙WIFI芯片,这部分应该对应相关power PIN脚操作。
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);//设置controller POWER ON/OFF ………… }
bt_vnd_if这个结构体在idh.code\external\bluetooth\bluedroid\hci\include\bt_vendor_lib.h中定义,相对应的op函数在bt_vendor_sprd.c中实现。
(1)、bt_vnd_if结构体:
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的函数实现
vendor\sprd\open-source\libs\libbt\src\bt_vendor_sprd.c
相对应不同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//这部分代码展讯平台没有控制; 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
这部分主要完成蓝牙MAC地址、RF射频相关设定,流程如下所示。
(1)、发送HC_EVENT_POSTLOAD 信令,线程bt_hc_worker_thread接收并处理
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);//发送信号量给线程bt_hc_worker_thread }
10、bt_hc_worker_thread处理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);//打开串口; /* 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)、失败preload 回调函数 ………… }
11、bt_vnd_if->op(BT_VND_OP_FW_CFG, NULL);调用
vendor\sprd\open-source\libs\libbt\src\bt_vendor_sprd.c中的OP函数:
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);//初始化展讯平台 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);//初始化成功后回调函数 } else { ALOGE("Error : hci, smd initialization Error"); bt_vendor_cbacks->fwcfg_cb(BT_VND_OP_RESULT_FAIL); } } } break; }
(1)、sprd_config_init的实现
这部分针对芯片部分,展讯的蓝牙芯片处理流程,在这里完成:蓝牙MAC地址、RF ini文件相关;
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地址创建如果btmac不存在,随机生成; { 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,这里完成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 FOROM FILE ,这里完成 INI 文件的初始化:这部分内容和芯片相关, 不同厂商的芯片有不同的处理方法;
++++++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,获取板子信息,给board_type赋值,后面选择用那个ini文件。这个是展讯平台相关,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)、获取硬件版本信息 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)、获得相应的版本的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)、解析相应数据 free(pBuf); return 0; }
获取硬件版本信息
fd_board_type = open(BOARD_TYPE_PATH,O_RDONLY);
Board_type如下图:
获得相应的版本的PSKEY;
char *CFG_2351_PATH[] = { "/system/etc/connectivity_configure_hw100.ini", "/system/etc/connectivity_configure_hw102.ini", "/system/etc/connectivity_configure_hw104.ini" };
解析相应数据
bt_dumpPskey((BT_PSKEY_CONFIG_T*)pData);
bt_vendor_cbacks->fwcfg_cb(BT_VND_OP_RESULT_SUCCESS);//初始化成功后回调函数,这部分在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);//对应preload_cb }
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);//发送BT_EVT_PRELOAD_CMPL到BTU_TASK } }
preload完成后,回调函数返回到BTU_TASK,启动BT其他协议层的初始化。
下节我们分析:
1、GKI_send_msg进程间通信如何完成;
2、bta_sys_sendmsg event如何解析;
3、GKI_Wait实现流程;