Openharmony 添加內核驅動(L1)

作者：拓維信息_青松 2022-03-28 15:40:34

系統 OpenHarmony

此文章以openharmony 3.1代碼基礎，介紹liteos-a ipcamera_hispark_taurus上添加khdf步驟。

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簡介

此文章以openharmony 3.1代碼基礎

介紹liteos-a ipcamera_hispark_taurus上添加khdf步驟。
介紹驅動的簡單調用(3516開發板：HiSpark_AI_Hi3516D_One_Light_VER.B開發板上測試。

驅動添加

驅動目錄結構

驅動代碼見附件。

驅動目錄以外的文件配置

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.
                }
            }
        }

驅動編譯配置

從代碼根目錄切換到kernel/liteos_a/。

cd kernel/liteos_a/

執行make menuconfig。

選擇driver。

選擇framework support。

選擇my_sample driver。

按q，保存退出。

驅動調用可執行程序

目錄結構

驅動調用代碼。

驅動調用可執行程序詳細代碼見附件。

代碼目錄結構之外的文件配置

文件build\lite\components\myapp.json。

{
  "components": [
    {
      "component": "myapp",
      "description": "my app",
      "optional": "false",
      "dirs": [
        "myapp"
      ],
      "targets": [
        "http://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。

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

編譯

編譯環境參考：??3516應用調用到驅動實踐??。

執行下面2條命令。

hb set
.

執行hb build -f。

燒錄測試

燒錄步驟參考：??3516應用調用到驅動實踐??。

切換到/bin目錄下執行：./my_sample_driver_test。

結果如圖：

??官網文檔??