小米alot开发板实验
时间: 2023-09-10 17:06:02 浏览: 50
下面以使用小米ALOT开发板实现LED闪烁的实验为例,介绍一下如何使用小米ALOT开发板进行实验。
实验材料:
- 小米ALOT开发板
- USB线
- LED灯
实验步骤:
1. 连接开发板和电脑。将小米ALOT开发板通过USB线连接到电脑上,并安装好驱动程序。
2. 安装开发环境。下载安装Android Studio和OpenJDK,打开Android Studio,创建一个新的Android项目。
3. 编写代码。在MainActivity.java文件中编写代码,实现LED灯闪烁的功能。例如:
```
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private static final String GPIO_PATH = "/sys/class/gpio";
private static final String GPIO_PIN = "gpio27";
private static final String GPIO_DIRECTION_PATH = GPIO_PATH + "/direction";
private static final String GPIO_VALUE_PATH = GPIO_PATH + "/value";
private static final String GPIO_EXPORT_PATH = GPIO_PATH + "/export";
private static final String GPIO_UNEXPORT_PATH = GPIO_PATH + "/unexport";
private static final String GPIO_DIRECTION_OUT = "out";
private boolean ledOn = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initGPIO();
blinkLED();
}
private void initGPIO() {
// 导出GPIO控制引脚
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(GPIO_EXPORT_PATH));
writer.write(GPIO_PIN);
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
// 设置GPIO控制引脚为输出模式
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(GPIO_DIRECTION_PATH));
writer.write(GPIO_DIRECTION_OUT);
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private void blinkLED() {
// 控制LED灯闪烁
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(GPIO_VALUE_PATH));
if (ledOn) {
writer.write("0");
ledOn = false;
} else {
writer.write("1");
ledOn = true;
}
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
protected void onDestroy() {
super.onDestroy();
// 取消GPIO控制引脚的导出
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(GPIO_UNEXPORT_PATH));
writer.write(GPIO_PIN);
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
```
4. 运行程序。将LED灯连接到小米ALOT开发板的GPIO27引脚上,然后运行程序,LED灯就会开始闪烁。
通过这个实验,可以初步了解小米ALOT开发板的使用方法,以及如何通过GPIO接口控制外部设备。当然,实验只是一个简单的示例,更复杂的应用场景需要根据实际需求进行开发。