Android(安卓)Bluetooth Address

蓝牙地址的NV项是447项，蓝牙地址一般从NV读取，所以连接上QXDM，修改NV447项就可以修改蓝牙的MAC地址。Android修改NV 447项之后，发现修改不起作用。原来Android的蓝牙地址可以从/persist/.bt_nv.bin读,也可以从NV447读，关键就看一个 vendor/.../bt/hci_qcomm_init/Android.mk的设置如果要从nv447读，则
BT_QSOC_GET_ITEMS_FROM_NV = 1
BT_QSOC_GET_ITEMS_FROM_PERSIST = 1
BT_QSOC_GET_ITEMS_FROM_PERSIST_THEN_NV = 1

将BT_QSOC_GET_ITEMS_FROM_PERSIST_THEN_NV注释掉，如果从.bt_nv.bin读就取消注释。
读取蓝牙地址的代码在同一目录下的 bthci_qcomm_linux.cpp，修改了Android.mk文件后，要保证 bthci_qcomm_linux.cpp能被重新编译下修改才能起作用。获得蓝牙地址代码如下：

boolean bt_hci_qcomm_pfal_get_bdaddress ( uint8 *pCmdBuffer ) {  boolean bd_set = FALSE;  if (verbose > 2)  {    fprintf (stderr, "get_bdaddr: before: 0x%02x.0x%02x.0x%02x.0x%02x.0x%02x.0x%02x\n",             BD_addr[0], BD_addr[1], BD_addr[2], BD_addr[3], BD_addr[4], BD_addr[5]);  }  if (BD_addr_string != NULL) /* BD_ADDR was passed in as -b arg */  {    /* convert ASCII HEX representation to 48 bits */    /* BD_addr is little-endian, but string is as printed */    BD_addr[5] = strtol (&BD_addr_string[ 0], 0, 16);    BD_addr[4] = strtol (&BD_addr_string[ 3], 0, 16);    BD_addr[3] = strtol (&BD_addr_string[ 6], 0, 16);    BD_addr[2] = strtol (&BD_addr_string[ 9], 0, 16);    BD_addr[1] = strtol (&BD_addr_string[12], 0, 16);    BD_addr[0] = strtol (&BD_addr_string[15], 0, 16);    bd_set = TRUE;  }  else /* get BD_ADDR from NV or set it to RANDOM */  {#if defined(BT_QSOC_GET_ITEMS_FROM_PERSIST_THEN_NV)    static nv_persist_item_type my_nv_persist_item; /* nv_bd_addr_type */    static nv_persist_stat_enum_type persistcmd_result;    persistcmd_result = (nv_persist_stat_enum_type)bt_nv_cmd(NV_PERSIST_READ_F,  NV_PERSIST_BD_ADDR_I, &my_nv_persist_item);    if (NV_PERSIST_SUCCESS  != persistcmd_result)    {        if (verbose > 0)        {            fprintf (stderr, "bt_nv_cmd failed to get BD_ADDR from NV, code %d\n", persistcmd_result);        }        static nv_item_type my_nv_item; /* nv_bd_addr_type */        static nv_stat_enum_type cmd_result;               if (nv_available)        {          cmd_result = nv_cmd_remote(NV_READ_F,  NV_BD_ADDR_I, &my_nv_item);        }        else        {          cmd_result = NV_FAIL_S;        }        if (NV_DONE_S != cmd_result)        {          if (verbose > 0)          {             fprintf (stderr, "nv_cmd_remote failed to get BD_ADDR from NV, code %d\n", cmd_result);          }        }        else        {          /* copy bytes */          BD_addr[5] = my_nv_item.bd_addr.bd_addr[5];          BD_addr[4] = my_nv_item.bd_addr.bd_addr[4];          BD_addr[3] = my_nv_item.bd_addr.bd_addr[3];          BD_addr[2] = my_nv_item.bd_addr.bd_addr[2];          BD_addr[1] = my_nv_item.bd_addr.bd_addr[1];          BD_addr[0] = my_nv_item.bd_addr.bd_addr[0];          bd_set = TRUE;        }    }    else    {        /* copy bytes */        BD_addr[5] = my_nv_persist_item.bd_addr[5];        BD_addr[4] = my_nv_persist_item.bd_addr[4];        BD_addr[3] = my_nv_persist_item.bd_addr[3];        BD_addr[2] = my_nv_persist_item.bd_addr[2];        BD_addr[1] = my_nv_persist_item.bd_addr[1];        BD_addr[0] = my_nv_persist_item.bd_addr[0];        bd_set = TRUE;    }#else#if defined(BT_QSOC_GET_ITEMS_FROM_NV)    static nv_item_type my_nv_persist_item; /* nv_bd_addr_type */    static nv_stat_enum_type persistcmd_result;    if (nv_available)    {      persistcmd_result = nv_cmd_remote(NV_READ_F,  NV_BD_ADDR_I, &my_nv_persist_item);    }    else    {      persistcmd_result = NV_FAIL_S;    }    if (NV_DONE_S != persistcmd_result)    {      if (verbose > 0)      {         fprintf (stderr, "nv_cmd_remote failed to get BD_ADDR from NV, code %d\n", persistcmd_result);      }    }    else    {      /* copy bytes */      BD_addr[5] = my_nv_persist_item.bd_addr.bd_addr[5];      BD_addr[4] = my_nv_persist_item.bd_addr.bd_addr[4];      BD_addr[3] = my_nv_persist_item.bd_addr.bd_addr[3];      BD_addr[2] = my_nv_persist_item.bd_addr.bd_addr[2];      BD_addr[1] = my_nv_persist_item.bd_addr.bd_addr[1];      BD_addr[0] = my_nv_persist_item.bd_addr.bd_addr[0];      bd_set = TRUE;    }#elif defined(BT_QSOC_GET_ITEMS_FROM_PERSIST)    static nv_persist_item_type my_nv_persist_item; /* nv_bd_addr_type */    static nv_persist_stat_enum_type persistcmd_result;    persistcmd_result = (nv_persist_stat_enum_type)bt_nv_cmd(NV_PERSIST_READ_F,  NV_PERSIST_BD_ADDR_I, &my_nv_persist_item);    if (NV_PERSIST_SUCCESS  != persistcmd_result)    {        if (verbose > 0)        {            fprintf (stderr, "bt_nv_cmd failed to get BD_ADDR from NV, code %d\n", cmd_result);        }    }    else    {        /* copy bytes */        BD_addr[5] = my_nv_persist_item.bd_addr[5];        BD_addr[4] = my_nv_persist_item.bd_addr[4];        BD_addr[3] = my_nv_persist_item.bd_addr[3];        BD_addr[2] = my_nv_persist_item.bd_addr[2];        BD_addr[1] = my_nv_persist_item.bd_addr[1];        BD_addr[0] = my_nv_persist_item.bd_addr[0];        bd_set = TRUE;    }#else /* not BT_QSOC_GET_ITEMS_FROM_NV - running on PC not MSM */    /* then set the non-manufacturer part to random */    BTHCI_QCOMM_TRACE ("bt_hci_qcomm_pfal_get_bdaddress: BD_ADDR not avialable from NV.\n");#endif /* not on PC */#endif  }  if (!bd_set)  {   int seed;   struct timespec sTime;   if (-1 == clock_gettime (CLOCK_REALTIME, &sTime))   {perror ("clock_gettime\n" );return (FALSE);   }   seed = sTime.tv_nsec;   srand ((unsigned int) seed);   BD_addr[0] = (rand() & 0x0FF00000) >> 20;   BD_addr[1] = (rand() & 0x0FF00000) >> 20;   BD_addr[2] = (rand() & 0x0FF00000) >> 20;  }  memcpy( pCmdBuffer, BD_addr, sizeof(BD_addr) );  if (verbose > 2)  {    fprintf (stderr, "get_bdaddr: after: %02x.%02x.%02x.%02x.%02x.%02x\n",             BD_addr[0], BD_addr[1], BD_addr[2], BD_addr[3], BD_addr[4], BD_addr[5]);  }  return TRUE; /* for now -- need error checking? */}

BT_QSOC_GET_ITEMS_FROM_PERSIST_THEN_NV不仅控制蓝牙地址，在bt_hci_qcomm_pfal_is_refclock_19P2MHz和bt_hci_qcomm_pfal_is_clocksharing_enabled这两个函数中也有用到。不过不用担心这个注释会影响蓝牙的时钟读取，时钟信息都是写死在芯片里，不用从NV或者配置文件获得。

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