#星光计划2.0# OpenHarmony3.0上采用ets开发HAP控制LED灯 原创 精华

import led from '@ohos.led'

@Entry
@Component
struct Led {
  @State private imgpath: string = 'app.media.ledoff'
  @State private isShow: boolean= false

  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
      Text('LED 灯控制')
        .fontSize(25)
        .fontWeight(FontWeight.Bold)
        .margin({bottom: 30})
      Image($r('app.media.ledoff'))
        .objectFit(ImageFit.Contain)
        .width(150)
        .height(150)
        .visibility(this.isShow ? Visibility.None : Visibility.Visible)
      Image($r('app.media.ledon'))
        .objectFit(ImageFit.Contain)
        .width(150)
        .height(150)
        .visibility(this.isShow ? Visibility.Visible : Visibility.None)

      Flex({ alignItems: ItemAlign.Center, justifyContent: FlexAlign.SpaceEvenly }) {
        Button('关闭', { type: ButtonType.Capsule, stateEffect: true }).backgroundColor(0x317aff).width(150).height(50).backgroundColor("#aaaaaa")
          .onClick((event: ClickEvent) => {
            this.isShow = false

            led.switchLed(19, 0);

          })
        Button('打开', { type: ButtonType.Capsule, stateEffect: true }).backgroundColor(0x317aff).width(150).height(50)
        .onClick((event: ClickEvent) => {
          this.isShow = true

          led.switchLed(19, 1);

        })

      }.width("100%")
      .margin({ top: 50 })
    }
    .width('100%')
    .height('100%')
    .padding(10)
  }
}
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import("//build/ohos.gni")

ohos_shared_library("led") {
  include_dirs = [
    "//third_party/node/src",
    "//foundation/ace/napi/interfaces/kits",
  ]

  sources = [
    "led_javascript_class.cpp",
    "native_module_led.cpp",
  ]

  deps = [ "//foundation/ace/napi:ace_napi" ]

  relative_install_dir = "module"
  
  external_deps = [ "hiviewdfx_hilog_native:libhilog" ]
  
  subsystem_name = "ace"
  part_name = "napi"
}
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#include <stdlib.h>     // standard library 标准库函数头文件
#include <stdio.h>      // standard input output 标准输入输出函数
#include <stdint.h>     // 定义了扩展的整数类型和宏

#include <unistd.h>     // POSIX 系统 API 访问功能的头文件
#include <fcntl.h>      // unix标准中通用的头文件 define O_WRONLY and O_RDONLY  

// #include <string.h>
#define GPIO_DIR_IN (char*)"in"
#define GPIO_DIR_OUT (char*)"out"
#define GPIO_VAL_LOW 0
#define GPIO_VAL_HIGH 1
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static napi_value SwitchLed(napi_env env, napi_callback_info info)
{
    HILOG_INFO("hey, SwitchLed - 0");
    
    size_t requireArgc = 2;
    size_t argc = 2;
    napi_value args[2] = { nullptr };
    NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, nullptr, nullptr));

    NAPI_ASSERT(env, argc >= requireArgc, "Wrong number of arguments");

    napi_valuetype valuetype0;
    NAPI_CALL(env, napi_typeof(env, args[0], &valuetype0));
    napi_valuetype valuetype1;
    NAPI_CALL(env, napi_typeof(env, args[1], &valuetype1));

    NAPI_ASSERT(env, valuetype0 == napi_number && valuetype1 == napi_number, "Wrong argument type. Numbers expected.");

    uint32_t gpio;
    NAPI_CALL(env, napi_get_value_uint32(env, args[0], &gpio));

    uint32_t val;
    NAPI_CALL(env, napi_get_value_uint32(env, args[1], &val));


	char direction[100] = {0};
    sprintf(direction,"echo out > /sys/class/gpio/gpio%d/direction", gpio);
    system(direction);

    char value[100] = {0};
    sprintf(value,"echo %d > /sys/class/gpio/gpio%d/value", val, gpio);
    system(value);
	
    napi_value sum;
    NAPI_CALL(env, napi_create_double(env, 1.0f, &sum));
    return sum;
}
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EXTERN_C_START
/*
 * function for module exports
 */
static napi_value Init(napi_env env, napi_value exports)
{
    /*
     * Properties define
     */
    napi_property_descriptor desc[] = {
        DECLARE_NAPI_FUNCTION("add", Add),
        DECLARE_NAPI_FUNCTION("minus", Minus),
        DECLARE_NAPI_FUNCTION("switchLed", SwitchLed),
        DECLARE_NAPI_FUNCTION("TestPromise", TestPromise),
        DECLARE_NAPI_FUNCTION("TestPromiseOrAsyncCallback", TestPromiseOrAsyncCallback),
    };
    NAPI_CALL(env, napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc));

    DemoJavascriptClassInit(env, exports);

    return exports;
}
EXTERN_C_END
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/*
 * Module define
 */
static napi_module ledModule = {
    .nm_version = 1,
    .nm_flags = 0,
    .nm_filename = nullptr,
    .nm_register_func = Init,
    .nm_modname = "led",
    .nm_priv = ((void*)0),
    .reserved = { 0 },
};
/*
 * Module register function
 */
extern "C" __attribute__((constructor)) void RegisterModule(void)
{
    napi_module_register(&ledModule);
}
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group("napi_packages_test") {
  testonly = true

  deps = [
    "sample/native_module_demo:demo",
    "sample/native_module_netserver:netserver",
    "sample/native_module_storage:storage",
"test/unittest:unittest",
"sample/native_module_led:led",
  ]

  if (is_standard_system) {
    deps += [ "sample/native_module_ability:ability" ]
  }
}
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            "name" : "boot",
            "cmds" : [
                "write /sys/class/gpio/export 19",
                "chmod 777 /sys/class/gpio/gpio19/direction",
                "chmod 777 /sys/class/gpio/gpio19/value",
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