• RK3588 USB蓝牙调试

    一.蓝牙基本概念

    蓝牙技术是一种无线通信的方式，利用特定频率的波段（2.4GHz-2.485GHz左右），进行电磁波传输。蓝牙传输原理是主从关系，一个主设备可以与7个蓝牙从设备配对。

    二.蓝牙标准

    蓝牙标准版本发展如下：

    三.安卓蓝牙框架

    libbt-vendor.so 完成对蓝牙模块硬件初始化与控制（物理通讯接口初始化，固件下载，供电控制）RK平台通过判断wifi+Bt模块的type，在libbuetooth_jni层选择加载不同适配厂商协议栈；并在libbt-hci中根据模块类型加载不同厂家模块的libbt-vendor.so，完成动态适配模块。

    libbluetooth主要是bluedroid的蓝牙协议栈的具体实现，向下调用libbt-hci的接口加载**libbt-vendor；**向上供libblueooth_jni的回调；

    bluetooth.apk 作 为 蓝 牙 服 务 进 程 ， 通 过 libblueooth_jni 层 获 取bluetooth*.default.so 提 供 的bt_interface_t 控 制 接 口 并 状 态 与 数 据 回 调 注 册 到bluetooth*.default.so；完成对蓝牙模块的控制与数据接收；

    四.USB 蓝牙模块的调试

    kernel部分

    首先，将Realtek提供的蓝牙驱动文件rtk_btusb.h和rtk_btusb.c拷贝到kernel的drivers/bluetooth/目录下：

    1. kernel-5.10/drivers/bluetooth/rtk_btusb.c
    2. kernel-5.10/drivers/bluetooth/rtk_btusb.h

    修改kernel的drivers/bluetooth/目录下的文件“Kconfig” 和“Makefile”

    1. config BT_RTKBTUSB
    2.     tristate "RTK HCI USB driver"
    3.     depends on USB
    4.     help
    5.        RTK Bluetooth HCI USB driver
    obj-$(CONFIG_BT_RTKBTUSB)	+= rtk_btusb.o

    平台对应的defconfig文件添加Realtek BT Chip支持的宏定义，或者在 kernel 中make menuconfig选中rtk_btusb driver相关的宏。

    CONFIG_BT_RTKBTUSB=y
    libbt-vendor.so的配置

    在hardware/realtek目录：HAL层添加蓝牙协议栈的代码和对应的libbt-vendor.so的源代码，libbt-vendor完成对蓝牙模块硬件初始化与控制（物理通讯接口初始化，固件下载，供电控制）

    1. @sw-eng:RK3588S$ cd hardware/realtek/rtkbt/vendor/firmware
    2. @sw-eng:firmware$ 
    3. @sw-eng:firmware$ ls
    4. BT_Firmware.mk        rtl8723a_fw              rtl8723c_fw          rtl8723f_config     rtl8761at_config        rtl8761cs_fw      rtl8822bs_config
    5. fw_info.txt           rtl8723as_config         rtl8723cs_cg_config  rtl8723f_fw         rtl8761at_fw            rtl8821a_config   rtl8822bs_fw
    6. readme.txt            rtl8723as_fw             rtl8723cs_cg_fw      rtl8723fs_config    rtl8761au8192ee_fw      rtl8821a_fw       rtl8822c_config
    7. rtl8703as_config      rtl8723b_config          rtl8723cs_vf_config  rtl8723fs_fw        rtl8761au8812ae_fw      rtl8821as_config  rtl8822c_fw
    8. rtl8703as_fw          rtl8723b_config_2Ant_S0  rtl8723cs_vf_fw      rtl8725a_config     rtl8761au_fw            rtl8821as_fw      rtl8822cs_config
    9. rtl8703bs_config      rtl8723b_fw              rtl8723cs_xx_config  rtl8725a_fw         rtl8761aw8192eu_config  rtl8821c_config   rtl8822cs_fw
    10. rtl8703bs_fw          rtl8723bs_config         rtl8723cs_xx_fw      rtl8725as_config    rtl8761aw8192eu_fw      rtl8821c_fw       rtl8852as_config
    11. rtl8703cs_config      rtl8723bs_fw             rtl8723d_config      rtl8725as_fw        rtl8761b_config         rtl8821cs_config  rtl8852as_fw
    12. rtl8703cs_fw          rtl8723bs_VQ0_config     rtl8723d_fw          rtl8761a_config     rtl8761b_fw             rtl8821cs_fw      rtl8852au_config
    13. rtl8723a_config       rtl8723bs_VQ0_fw         rtl8723ds_config     rtl8761at8192ee_fw  rtl8761bt_config        rtl8822b_config   rtl8852au_fw
    14. rtl8723a_config_addr  rtl8723bu_config         rtl8723ds_fw         rtl8761at8812ae_fw  rtl8761bt_fw            rtl8822b_fw
    15. cfliu@sw-eng:firmware$

    最终会通过mk文件hardware/realtek/rtkbt/rtkbt.mk拷贝到机器的以下目录，打开蓝牙的时候会去加载fw：

    1. ifeq ($(strip $(TARGET_BOARD_PLATFORM_PRODUCT)), tablet)
    2. BT_FIRMWARE_FILES := $(shell ls $(CUR_PATH)/vendor/firmware)
    3. PRODUCT_COPY_FILES += \
    4. 	$(foreach file, $(BT_FIRMWARE_FILES), $(CUR_PATH)/vendor/firmware/$(file):$(TARGET_COPY_OUT_VENDOR)/etc/firmware/$(file))

    最终拷贝到设备上为：/vendor/etc/firmware

    1. pro:/vendor/etc/firmware # ls
    2. 4343A0.hcd                       bcm4329.hcd                  fw_awnb108_ap.bin           fw_bcm43438a0.bin                fw_cyw43438.bin       nvram_ap6212a.txt    rtl8703bs_config         rtl8723ds_config        rtl8821a_fw
    3. AP6275P_NVRAM_V1.1_20200702.txt  bcm43341b0.hcd               fw_bcm40181a2.bin           fw_bcm43438a0_apsta.bin          fw_cyw43455.bin       nvram_ap6214.txt     rtl8703bs_fw             rtl8723ds_fw            rtl8821as_config
    4. BCM20710A1.hcd                   bcm4339a0.hcd                fw_bcm40181a2_apsta.bin     fw_bcm43438a0_p2p.bin            fw_info.txt           nvram_ap6214a.txt    rtl8703cs_config         rtl8723f_config         rtl8821as_fw
    5. BCM4330B1.hcd                    bcm43438a0.hcd               fw_bcm40183b2.bin           fw_bcm43438a1.bin                mali_csffw.bin        nvram_ap6216.txt     rtl8703cs_fw             rtl8723f_fw             rtl8821c_config
    6. BCM4343A0.hcd                    bcm43438a1.hcd               fw_bcm40183b2_ag.bin        fw_bcm43438a1_apsta.bin          nh660.hcd             nvram_ap6233f.txt    rtl8723a_config          rtl8723fs_config        rtl8821c_fw
    7. BCM4343A1.hcd                    bcm4354a1.hcd                fw_bcm40183b2_ag_apsta.bin  fw_bcm43438a1_p2p.bin            nvram.txt             nvram_ap6236.txt     rtl8723a_config_addr     rtl8723fs_fw            rtl8821cs_config
    8. BCM4343B0.hcd                    clm_bcm43752a2_ag.blob       fw_bcm40183b2_ag_p2p.bin    fw_bcm43455c0_ag.bin             nvram_4330.txt        nvram_ap6255.txt     rtl8723a_fw              rtl8725a_config         rtl8821cs_fw
    9. BCM4345C0.hcd                    clm_bcm43752a2_pcie_ag.blob  fw_bcm40183b2_apsta.bin     fw_bcm43455c0_ag_apsta.bin       nvram_4330_oob.txt    nvram_ap6256.txt     rtl8723as_config         rtl8725a_fw             rtl8822b_config
    10. BCM4345C5.hcd                    clm_bcm4375b4_pcie_ag.blob   fw_bcm40183b2_p2p.bin       fw_bcm43455c0_ag_p2p.bin         nvram_AP6181.txt      nvram_ap6275hh3.txt  rtl8723as_fw             rtl8725as_config        rtl8822b_fw
    11. BCM4354A2.hcd                    config.txt                   fw_bcm43241b4_ag.bin        fw_bcm43456c5_ag.bin             nvram_AP6210.txt      nvram_ap6275s.txt    rtl8723b_config          rtl8725as_fw            rtl8822bs_config
    12. BCM4356A2.hcd                    esp32                        fw_bcm43241b4_ag_apsta.bin  fw_bcm43456c5_ag_apsta.bin       nvram_AP6210_24M.txt  nvram_ap62x2.txt     rtl8723b_config_2Ant_S0  rtl8761a_config         rtl8822bs_fw
    13. BCM4359C0.hcd                    fw_RK901.bin                 fw_bcm43241b4_ag_p2p.bin    fw_bcm4354a1_ag.bin              nvram_AP6234.txt      nvram_ap6354.txt     rtl8723b_fw              rtl8761at8192ee_fw      rtl8822c_config
    14. BCM4362A2.hcd                    fw_RK901a0.bin               fw_bcm4330.bin              fw_bcm4354a1_ag_apsta.bin        nvram_AP6275P.txt     nvram_ap6356.txt     rtl8723bs_VQ0_config     rtl8761at8812ae_fw      rtl8822c_fw
    15. BCM4375B1.hcd                    fw_RK901a0_apsta.bin         fw_bcm4330_apsta.bin        fw_bcm4354a1_ag_p2p.bin          nvram_AP6330.txt      nvram_ap6356s.txt    rtl8723bs_VQ0_fw         rtl8761at_config        rtl8822cs_config
    16. BT_Firmware.mk                   fw_RK901a2.bin               fw_bcm43341b0_ag.bin        fw_bcm4356a2_ag.bin              nvram_AP6335.txt      nvram_ap6398s.txt    rtl8723bs_config         rtl8761at_fw            rtl8822cs_fw
    17. RT2870AP.dat                     fw_RK901a2_apsta.bin         fw_bcm43341b0_ag_apsta.bin  fw_bcm4356a2_ag_apsta.bin        nvram_AP6441.txt      nvram_ap6398sa.txt   rtl8723bs_fw             rtl8761au8192ee_fw      rtl8852as_config
    18. RT2870APCard.dat                 fw_RK901a2_p2p.bin           fw_bcm43341b0_ag_p2p.bin    fw_bcm4356a2_ag_p2p.bin          nvram_AP6476.txt      nvram_ap6452.txt     rtl8723bu_config         rtl8761au8812ae_fw      rtl8852as_fw
    19. RT2870STA.dat                    fw_RK903.bin                 fw_bcm4334b1_ag.bin         fw_bcm4359c0_ag.bin              nvram_AP6493.txt      nvram_awnb108.txt    rtl8723c_fw              rtl8761au_fw            rtl8852au_config
    20. RT2870STACard.dat                fw_RK903_ag.bin              fw_bcm4334b1_ag_apsta.bin   fw_bcm4359c0_ag_apsta.bin        nvram_B23.txt         nvram_azw256.txt     rtl8723cs_cg_config      rtl8761aw8192eu_config  rtl8852au_fw
    21. awnb108.hcd                      fw_RK903_ag_apsta.bin        fw_bcm4334b1_ag_p2p.bin     fw_bcm4359c0_ag_p2p.bin          nvram_GB86302I.txt    nvram_azw372.txt     rtl8723cs_cg_fw          rtl8761aw8192eu_fw      ssv6051-sw.bin
    22. bcm20710a1.hcd                   fw_RK903_ag_p2p.bin          fw_bcm4339a0_ag.bin         fw_bcm43752a2_ag.bin             nvram_RK901.txt       otp.bin.z77          rtl8723cs_vf_config      rtl8761b_config         ssv6051-wifi.cfg
    23. bcm20710a1_24M.hcd               fw_RK903_p2p.bin             fw_bcm4339a0_ag_apsta.bin   fw_bcm43752a2_ag_apsta.bin       nvram_RK903.cal       readme.txt           rtl8723cs_vf_fw          rtl8761b_fw             wifi_efuse_8189e.map
    24. bcm20710a1_26M.hcd               fw_RK903b2.bin               fw_bcm4339a0_ag_p2p.bin     fw_bcm43752a2_pcie_ag.bin        nvram_RK903.txt       rk903.hcd            rtl8723cs_xx_config      rtl8761bt_config        wifi_efuse_8723bs-vq0.map
    25. bcm2076b1.hcd                    fw_RK903b2_apsta.bin         fw_bcm43436b0.bin           fw_bcm43752a2_pcie_ag_apsta.bin  nvram_RK903_26M.cal   rk903_26M.hcd        rtl8723cs_xx_fw          rtl8761bt_fw            wifi_efuse_8723cs.map
    26. bcm40183b2.hcd                   fw_RK903b2_p2p.bin           fw_bcm43436b0_apsta.bin     fw_bcm4375b4_pcie_ag.bin         nvram_WL211.txt       rtl8703as_config     rtl8723d_config          rtl8761cs_fw            wifi_efuse_8723ds.map
    27. bcm43241b4.hcd                   fw_awnb108.bin               fw_bcm43436b0_p2p.bin       fw_bcm4375b4_pcie_ag_apsta.bin   nvram_ap6212.txt      rtl8703as_fw         rtl8723d_fw              rtl8821a_config         wifi_efuse_8821cs.map
    28.
    根据type选择具体的vendor库

    部分HAL层对应的libbt-vendor.so的源代码浅析：
    首先是bluedroid 蓝牙协议栈libbt-hci【原生蓝牙协议栈】通过system/bt/hci/src/hci_layer_android.cc的hci_initialize函数，调用interfaces/bluetooth/1.0/default/vendor_interface.cc中的initialize函数，进而调用open函数打开对应so库。
     

    1. //interfaces/bluetooth/1.0/default/vendor_interface.cc
    2. static const char* VENDOR_LIBRARY_NAME = "libbt-vendor.so";
    3. static const char* VENDOR_REALTEK_LIBRARY_NAME = "libbt-vendor-realtek.so";
    4.  
    5. static char wifi_type[64] = {0};
    6. extern "C" int check_wifi_chip_type_string(char *type);
    7. bool VendorInterface::Open(InitializeCompleteCallback initialize_complete_cb,
    8.                            PacketReadCallback event_cb,
    9.                            PacketReadCallback acl_cb,
    10.                            PacketReadCallback sco_cb,
    11.                            PacketReadCallback iso_cb) {
    12.   initialize_complete_cb_ = initialize_complete_cb;
    13.   char vendor_lib_name[32];
    14.  
    15.   // Initialize vendor interface
    16.   if (wifi_type[0] == 0)
    17.       //获取当前wifi芯片的type加载不同的so库，目前这个接口有权限问题，待进一步分析
    18. 	  check_wifi_chip_type_string(wifi_type);
    19.   if ((0 == strncmp(wifi_type, "RTL", 3)) ||
    20.       (0 == strncmp(wifi_type, "SSV", 3))) { // for ssv6051 wifi + rtl8761 bt
    21.       //此时加载的是libbt-vendor-realtek.so
    22.     strcpy(vendor_lib_name, VENDOR_REALTEK_LIBRARY_NAME);
    23.   } else {
    24.       //此时加载的是libbt-vendor.so
    25.     strcpy(vendor_lib_name, VENDOR_LIBRARY_NAME);
    26.   }
    27.  
    28.   ALOGD("%s: %s", __func__, vendor_lib_name);
    29.   lib_handle_ = dlopen(vendor_lib_name, RTLD_NOW);
    30.   if (!lib_handle_) {
    31.     ALOGE("%s unable to open %s (%s)", __func__, vendor_lib_name,
    32.           dlerror());
    33.     return false;
    34.   }
    35.  
    36.   lib_interface_ = reinterpret_cast<bt_vendor_interface_t*>(
    37.       dlsym(lib_handle_, VENDOR_LIBRARY_SYMBOL_NAME));
    38.   if (!lib_interface_) {
    39.     ALOGE("%s unable to find symbol %s in %s (%s)", __func__,
    40.           VENDOR_LIBRARY_SYMBOL_NAME, vendor_lib_name, dlerror());
    41.     return false;
    42.   }
    43.  
    44.   // Get the local BD address
    45.   uint8_t local_bda[BluetoothAddress::kBytes];
    46.   //获取本地的蓝牙地址
    47.   if (!BluetoothAddress::get_local_address(local_bda)) {
    48.     LOG_ALWAYS_FATAL("%s: No Bluetooth Address!", __func__);
    49.   }
    50.   //接口的初始化
    51.   int status = lib_interface_->init(&lib_callbacks, (unsigned char*)local_bda);
    52.   if (status) {
    53.     ALOGE("%s unable to initialize vendor library: %d", __func__, status);
    54.     return false;
    55.   }
    56.  
    57.   ALOGD("%s vendor library loaded", __func__);
    58.  
    59.   // Power on the controller
    60.   int power_state = BT_VND_PWR_ON;
    61.   lib_interface_->op(BT_VND_OP_POWER_CTRL, &power_state);
    62.  
    63.   // Get the UART socket(s)
    64.   int fd_list[CH_MAX] = {0};
    65.   int fd_count = lib_interface_->op(BT_VND_OP_USERIAL_OPEN, &fd_list);
    66.  
    67.   if (fd_count < 1 || fd_count > CH_MAX - 1) {
    68.     ALOGE("%s: fd_count %d is invalid!", __func__, fd_count);
    69.     return false;
    70.   }
    71.  
    72.   for (int i = 0; i < fd_count; i++) {
    73.     if (fd_list[i] == INVALID_FD) {
    74.       ALOGE("%s: fd %d is invalid!", __func__, fd_list[i]);
    75.       return false;
    76.     }
    77.   }
    78.  
    79.   event_cb_ = event_cb;
    80.   PacketReadCallback intercept_events = [this](const hidl_vec<uint8_t>& event) {
    81.     HandleIncomingEvent(event);
    82.   };
    83.  
    84.   if (fd_count == 1) {
    85.     hci::H4Protocol* h4_hci =
    86.         new hci::H4Protocol(fd_list[0], intercept_events, acl_cb, sco_cb, iso_cb);
    87.     fd_watcher_.WatchFdForNonBlockingReads(
    88.         fd_list[0], [h4_hci](int fd) { h4_hci->OnDataReady(fd); });
    89.     hci_ = h4_hci;
    90.   } else {
    91.     hci::MctProtocol* mct_hci =
    92.         new hci::MctProtocol(fd_list, intercept_events, acl_cb);
    93.     fd_watcher_.WatchFdForNonBlockingReads(
    94.         fd_list[CH_EVT], [mct_hci](int fd) { mct_hci->OnEventDataReady(fd); });
    95.     fd_watcher_.WatchFdForNonBlockingReads(
    96.         fd_list[CH_ACL_IN], [mct_hci](int fd) { mct_hci->OnAclDataReady(fd); });
    97.     hci_ = mct_hci;
    98.   }
    99.  
    100.   // Initially, the power management is off.
    101.   lpm_wake_deasserted = true;
    102.  
    103.   // Start configuring the firmware
    104.   //配置和加载Firmware
    105.   firmware_startup_timer_ = new FirmwareStartupTimer();
    106.   lib_interface_->op(BT_VND_OP_FW_CFG, nullptr);
    107.  
    108.   return true;
    109. }
    协议栈的选择
    1. //packages/apps/Bluetooth/jni/com_android_bluetooth_btservice_AdapterService.cpp
    2. static void classInitNative(JNIEnv* env, jclass clazz) {
    3.     ......
    4.     char type[64];
    5.     check_wifi_chip_type_string(type);
    6.     if (!strncmp(type, "RTL", 3)) { //加载rtl厂商对应的蓝牙协议栈的库：bluetooth_rtk.default.so
    7.         ALOGD("%s, load %s.default.so", __func__, BT_STACK_RTK_MODULE_ID); 
    8.         err = hw_get_module(BT_STACK_RTK_MODULE_ID, (hw_module_t const**)&module);
    9.     } else { //加载原生的蓝牙协议栈的库：bluetooth.default.so
    10.         ALOGD("%s, load %s.default.so", __func__, id);
    11.         err = hw_get_module(id, (hw_module_t const**)&module);
    12.     }
    13. }
    14.  
    15. //处理一些回调
    16. const bt_vendor_callbacks_t lib_callbacks = {
    17.     sizeof(lib_callbacks), firmware_config_cb, sco_config_cb,
    18.     low_power_mode_cb,     sco_audiostate_cb,  buffer_alloc_cb,
    19.     buffer_free_cb,        transmit_cb,        epilog_cb,
    20.     a2dp_offload_cb};
    21.  
    22. }  // namespace
    23. //BT_STACK_RTK_MODULE_ID在./hardware/libhardware/include/hardware/bluetooth.h定义

    五.在RK安装蓝牙调试工具验证

    直接在浏览器搜索下载即可：

    到BUMBLE这个设备，点击连接；

    连上之后，就会看到4个蓝牙服务，实时日志里也会看到连接状态的提示；

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  • 原文地址：https://blog.csdn.net/weixin_49303682/article/details/133800754