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本文來源電子發燒友社區，作者：跋扈洋，帖子地址：https://bbs.elecfans.com/jishu_2006813_1_1.html

LED燈閃爍（開發板體驗視頻，詳見作者原文章鏈接）

修改源碼目錄結構先在./applications/sample/wifi-iot/app路徑下新建一個目錄（或一套目錄結構），用于存放業務源碼文件。
本例程：在app下新增業務led，其中led.c為業務代碼，BUILD.gn為編譯腳本，具體規劃目錄結構如下：

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

復制代碼

業務代碼。
新建./applications/sample/wifi-iot/app/led下的led.c文件，在led.c中新建業務入口函數led，并實現業務邏輯。并在代碼最下方，使用HarmonyOS啟動恢復模塊接口SYS_RUN()啟動業務。（SYS_RUN定義在ohos_init.h文件中）

BUILD.gn為編譯腳本
led.c為業務邏輯代碼所在文件

led.c

[indent]
#include
#include
#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"
#define LED_ON_TIME_US 2000000
#define LED_OFF_TIME_US 1000000
static void Led(void)
{
GpioInit();
IoSetFunc(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_IO_FUNC_GPIO_9_GPIO);
GpioSetDir(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_GPIO_DIR_OUT);
while (1) {
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_9, 0);
printf("[DEMO] LED on.n");
usleep(LED_ON_TIME_US);
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_9, 1);
printf("[DEMO] LED off.n");
usleep(LED_OFF_TIME_US);
}
}
SYS_RUN(Led);
[/indent]

復制代碼

BUILD.gn（app/BUILD.gn）

static_library("bahuyang") {

sources = [

"led.c"

include_dirs = [

"http://utils/native/lite/include",

"http://kernel/liteos_m/components/cmsis/2.0",

"http://base/iot_hardware/interfaces/kits/wifiiot_lite",

}

“bahuyang”:是生成靜態庫名稱，可隨意更改
“led.c”：代碼文件

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("http://build/lite/config/component/lite_component.gni")

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

lite_component("app") {

features = [

#"startup",

"led:bahuyang"

}

將"startup"注釋，運行我們自己的文件
“led”:工程目錄
bahuyang:靜態庫文件