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修改源码

目录结构

先在./applications/sample/wifi-iot/app路径下新建一个目录（或一套目录结构），用于存放业务源码文件。
本例程：在app下新增业务chuankou，其中hello_world.c为业务代码，BUILD.gn为编译脚本，具体规划目录结构如下：

.
└── applications
    └── sample
        └── wifi-iot
            └── app
                │── chuankou
                │  │── hello_world.c
                │  └── BUILD.gn
                └── BUILD.gn

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业务代码。

新建./applications/sample/wifi-iot/app/chuankou下的hello_world.c文件，在hello_world.c中新建业务入口函数HelloWorld，并实现业务逻辑。并在代码最下方，使用HarmonyOS启动恢复模块接口SYS_RUN()启动业务。（SYS_RUN定义在ohos_init.h文件中）

BUILD.gn为编译脚本
hello_world.c为业务逻辑代码所在文件

hello_world.c

#include <stdio.h>
#include "ohos_init.h"
#include "ohos_types.h"
 
void led(void)
{
    int i=0;
    for(i=0;i<4;i++)//输出四遍
    {
        
    printf("[DEMO] zhangyang.\n");
    }
}
SYS_RUN(led);


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BUILD.gn（app/BUILD.gn）

static_library("bahuyang") {
    sources = [
        "led.c"
    ]
    include_dirs = [
        "//utils/native/lite/include"
    ]
}

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“bahuyang”:是生成静态库名称，可随意更改
“led.c”：代码文件

BUILD.gn（）

# Copyright (c) 2020 Huawei Device Co., Ltd.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import("//build/lite/config/component/lite_component.gni")

lite_component("app") {
    features = [
       # "startup",
        "chuankou:bahuyang"
    ]
}

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将”startup”注释，运行我们自己的文件
“chuankou”:工程目录
bahuyang:静态库文件