Android 从硬件到应用程序：一步一步爬上去 6 -- 我写的APP测试框架层硬件服务(终点)...

       创Android Applicationproject：采用Eclipse的Android插入ADT创Androidproject，project名字Gpio，创建完成后，project文件夹packages/apps/文件夹下，并删除project文件夹下的gen文件夹。不删除的话会造成类反复的错误。

src/com/android/gpio/Gpio.java：

package com.android.gpio;  
import com.android.gpio.R;  
import android.app.Activity;  
import android.os.ServiceManager;  
import android.os.Bundle;  
import android.os.IGpioService;  
import android.os.RemoteException;  
import android.util.Log;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  

public class Gpio extends Activity implements OnClickListener {  
private final static String LOG_TAG = "com.android.Gpio";  
private IGpioService gpioService = null;  

private Button setButton = null;  
private Button clearButton = null;  
  
/** Called when the activity is first created. */  
@Override  
public void onCreate(Bundle savedInstanceState) {  
	super.onCreate(savedInstanceState);  
	setContentView(R.layout.main);  

	gpioService = IGpioService.Stub.asInterface(  
	ServiceManager.getService("gpio"));  

	setButton = (Button)findViewById(R.id.button_set);  
	clearButton = (Button)findViewById(R.id.button_clear);  

	setButton.setOnClickListener(this);  
	clearButton.setOnClickListener(this);  
}  
  
@Override  
public void onClick(View v) {  
	if(v.equals(setButton)) {   
	try{
		int val='1';
		gpioService.setVal(val);
	} catch (RemoteException e){
		Log.e(LOG_TAG,"setting value");	
	}	
	} 
	else if(v.equals(clearButton)) {
	try{
		int val='0';
		gpioService.setVal(val);
	   } catch (RemoteException e){
		Log.e(LOG_TAG,"setting value");	
	   }	
	   }  
	}  
}  

布局res/layout/main.xml：

<?

xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <Button android:id="@+id/button_clear" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/clear" android:textStyle="bold" android:layout_marginTop="140dp"/> <Button android:id="@+id/button_set" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/set" android:textStyle="bold" android:layout_marginTop="0dp"/> </LinearLayout>

字符串res/values/strings.xml：

<?xml version="1.0" encoding="utf-8"?

> <resources> <string name="app_name">GPIO</string> <string name="set">Set</string> <string name="clear">Clear</string> </resources>

AndroidManifest.xml：

<?

xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.android.gpio" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name"> <activity android:name=".Gpio" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>

编辑project文件夹下Android.mk：

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional
LOCAL_SRC_FILES := $(call all-subdir-java-files)
LOCAL_PACKAGE_NAME := Gpio
LOCAL_CERTIFICATE := platform
include $(BUILD_PACKAGE)
include $(call all-makefiles-under,$(LOCAL_PATH))

编辑build/target/product/generic_no_telephony.mk：

在PRODUCT_PACKAGES := \ 后增加Gpio \

编译project会生成Gpio.apk

make TARGET_PRODUCT=am335xevm_sk -j8 OMAPES=4.x 

到这一步一切准备工作都已就绪，開始更新目标板am335evm的文件系统：(左为host，右为evm)

out/target/product/am335xevm_sk/system/app/Gpio.apk                 ==>   rootfs/

out/target/product/am335xevm_sk/system/framework/services.jar       ==>   rootfs/system/framework/

out/target/product/am335xevm_sk/system/framework/framework.jar      ==>   rootfs/system/framework/

out/target/product/am335xevm_sk/obj/lib/libandroid_servers.so       ==>   rootfs/system/lib/

out/target/product/am335xevm_sk/obj/lib/gpio.default.so             ==>   rootfs/system/lib/hw/

确保rootfs下 ueventd.rc 已经加入：(Android 从硬件到应用：一步一步向上爬 3 -- 硬件抽象层訪问硬件驱动  提到)

/dev/AdrIO                0666   root       root

启动，安装Gpio.apk。打开GPIO：

现象：

点击"Set"button：     D1灯亮    

点击"Clear"button：   D1灯灭

可见编写的APP通过调用硬件服务已经成功操作了AM335寄存器，改变AM335X_GPIO_LED4级别。经N渎MOS设备控制LED D1灯灭。

版权声明：本文博主原创文章，博客，未经同意不得转载。

转载于:https://www.cnblogs.com/mengfanrong/p/4848562.html