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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

驱动代码见附件

驱动目录以外的文件配置

文件drivers\adapter\khdf\liteos\hdf_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drivers\adapter\khdf\liteos\Kconfig

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

文件drivers\adapter\khdf\liteos\BUILD.gn

文件vendor\hisilicon\hispark_taurus\hdf_config\device_info\device_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

驱动调用可执行程序详细代码见附件
代码目录结构之外的文件配置

文件build\lite\components\myapp.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`vendor\hisilicon\hispark_taurus\config.json`
```json
     {
        "subsystem": "myapp",
        "components": [
          { "component": "myapp", "features":[] }
        ]
      }