Android from hardware to application: Compile the hardware service at the APP testing framework layer (complete)

Android from hardware to application: Compile the hardware service at the APP testing framework layer (complete)

Create an Android Application Project: Use the Android plug-in ADT of Eclipse to create an Android project named Gpio. After the project is created, copy the project directory to the packages/apps/folder, and delete the gen folder under the project directory. If you do not delete it, duplicate class errors will occur.

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");   }   }  }  }  

Layout res/layout/main. xml:

 

 

String res/values/strings. xml:

 

 

   
      
  
   GPIO
       
  
   Set
       
  
   Clear
    
   

AndroidManifest. xml:

 

 

Edit Android. mk in the project directory:

 

 

LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE_TAGS := optionalLOCAL_SRC_FILES := $(call all-subdir-java-files)LOCAL_PACKAGE_NAME := GpioLOCAL_CERTIFICATE := platforminclude $(BUILD_PACKAGE)include $(call all-makefiles-under,$(LOCAL_PATH))

Edit build/target/product/generic_no_telephony.mk:

 

Add Gpio \ After PRODUCT_PACKAGES := \

The compilation project will generate gpio.apk

 

make TARGET_PRODUCT=am335xevm_sk -j8 OMAPES=4.x 

At this step, all preparations are ready. Start to update the file system of the target board am335evm: (host on the left and evm on the right)

 

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/

Make sure that ueventd. rc under rootfs has been added: (Android from hardware to application: Step by Step climb 3 -- Hardware Abstraction Layer access hardware driver mentioned)

 

/dev/AdrIO                0666   root       root

Start, install gpio.apk, and enable GPIO:

 

Symptom:

Click "Set" button: D1 light on and click "Clear" button: D1 light off

It can be seen that the written APP has successfully operated the AM335 register by calling the hardware service, changed the AM335X_GPIO_LED4 level, and controlled the LED D1 light-off through the ngou MOS device.