Openharmony添加自定义驱动的教程

简介
此文章以openharmony 3.1代码基础
介绍liteos-a ipcamera_hispark_taurus上添加khdf步骤。
介绍驱动的简单调用(3516开发板：HiSpark_AI_Hi3516D_One_Light_VER.B开发板上测试)
驱动添加
驱动目录结构

驱动目录以外的文件配置
文件driversadapterkhdfliteoshdf_lite.mk
# my sample test
ifeq ($(LOSCFG_DRIVERS_HDF_MY_SAMPLE_DRIVER), y)
LITEOS_BASELIB += -lmy_sample_driver
LIB_SUBDIRS += $(LITEOS_DRIVERS_HDF)/my_sample_driver
endif

文件driversadapterkhdfliteosKconfig

source "../../drivers/adapter/khdf/liteos/my_sample_driver/Kconfig"

文件driversadapterkhdfliteosBUILD.gn

文件vendorhisiliconhispark_taurushdf_configdevice_infodevice_info.hcs
my_sample :: host {
         hostName = "my_sample_host";
         device_mysample :: device {
            device0 :: deviceNode {          // DeviceNode of the sample driver
                  policy = 2;                   // Driver service release policy. For details, see section Driver Service Management.
                  priority= 10;                // Driver startup priority (0-200). A larger value indicates a lower priority. The default value 100 is recommended. If the priorities are the same, the device loading sequence is random.
                  preload = 0;                   // On-demand loading of the driver. For details, see "NOTE" at the end of this section.
                  permission = 0664;             // Permission for the driver to create device nodes.
                  moduleName = "my_sample_driver";    // Driver name. The value of this field must be the same as the value of moduleName in the driver entry structure.
                  serviceName = "my_sample_service";    // Name of the service released by the driver. The name must be unique.
            }
         }
      }

驱动编译配置
从代码根目录切换到kernel/liteos_a/

cd kernel/liteos_a/
执行make menuconfig 选择driver

选择framework support

选择my_sample driver

按q，保存退出
驱动调用可执行程序
目录结构

驱动调用代码

代码目录结构之外的文件配置
文件buildlitecomponentsmyapp.json
{
  "components": [
{
   "component": "myapp",
   "description": "my app",
   "optional": "false",
   "dirs": [
      "myapp"
   ],
   "targets": [
      "//myapp:myapp"
   ],
   "rom": "",
   "ram": "",
   "output": [
   ],
   "adapted_kernel": [
      "liteos_a",
      "liteos_m"
   ],
   "features": [],
   "deps": {
      "third_party": [
      "bounds_checking_function"
      ],
      "components": []
   }
}
  ]
}
文件vendorhisiliconhispark_taurusconfig.json

   {
      "subsystem": "myapp",
      "components": [
      { "component": "myapp", "features":[] }
      ]
   }