ok6410 android driver(9)

In this essay, I will write the JNI to test our leds device.
　　If you don't know how to create a jni project, I suggest you to have a read on the following website : 

http://www.cnblogs.com/plinx/p/3213824.html

 
　　1、string.xml

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

<resources>



    <string name="app_name">ledsjni</string>

    <string name="action_settings">Settings</string>

    <string name="string_hello">String input:</string>

    <string name="str_button">Str Input</string>

    <string name="ioctl_hello">I/O control:</string>

    <string name="io_button">I/O Input</string>

    <string name="led1">Led1</string>

    <string name="led2">Led2</string>

    <string name="led3">Led3</string>

    <string name="led4">Led4</string>



</resources>

　　2、activity_main.xml
　　(1) graphical layout

　　TIPS :

Ok6410's screen is placing horizontally, so you should design your application horizontally to adapt the screen.

　　(2) activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >



    <CheckBox

        android:id="@+id/checkBox_str1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_below="@+id/textView_str"

        android:text="@string/led1" />



    <TextView

        android:id="@+id/textView_str"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:text="@string/string_hello" />



    <TextView

        android:id="@+id/textView_io"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/checkBox_str1"

        android:layout_below="@+id/checkBox_str1"

        android:text="@string/ioctl_hello" />



    <Button

        android:id="@+id/onClick_strButton"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_above="@+id/textView_io"

        android:layout_alignParentRight="true"

        android:onClick="onClick_strButton"

        android:text="@string/str_button" />



    <Button

        android:id="@+id/onClick_ioButton"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignRight="@+id/onClick_strButton"

        android:layout_below="@+id/textView_io"

        android:onClick="onClick_ioButton"

        android:text="@string/io_button" />



    <CheckBox

        android:id="@+id/checkBox_io1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_below="@+id/textView_io"

        android:text="@string/led1" />



    <CheckBox

        android:id="@+id/checkBox_io2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/textView_io"

        android:layout_toRightOf="@+id/checkBox_io1"

        android:text="@string/led2" />



    <CheckBox

        android:id="@+id/checkBox_io3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/textView_io"

        android:layout_toRightOf="@+id/checkBox_str2"

        android:text="@string/led3" />



    <CheckBox

        android:id="@+id/checkBox_io4"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/textView_io"

        android:layout_toRightOf="@+id/checkBox_io3"

        android:text="@string/led4" />



    <CheckBox

        android:id="@+id/checkBox_str2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/textView_str"

        android:layout_toRightOf="@+id/checkBox_str1"

        android:text="@string/led2" />



    <CheckBox

        android:id="@+id/checkBox_str3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/textView_str"

        android:layout_toRightOf="@+id/checkBox_str2"

        android:text="@string/led3" />



    <CheckBox

        android:id="@+id/checkBox_str4"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/textView_str"

        android:layout_toRightOf="@+id/checkBox_str3"

        android:text="@string/led4" />



</RelativeLayout>

　　3、MainActivity.java

package com.example.ledsjni;



import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.CheckBox;

import android.widget.TextView;



public class MainActivity extends Activity {

    private CheckBox[] cbox_str = new CheckBox[4];

    private CheckBox[] cbox_io  = new CheckBox[4];

    private TextView tview_str;

    private TextView tview_io;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        tview_str = (TextView)findViewById(R.id.textView_str);

        tview_io = (TextView)findViewById(R.id.textView_io);

        

        cbox_str[0] = (CheckBox)findViewById(R.id.checkBox_str1);

        cbox_str[1] = (CheckBox)findViewById(R.id.checkBox_str2);

        cbox_str[2] = (CheckBox)findViewById(R.id.checkBox_str3);

        cbox_str[3] = (CheckBox)findViewById(R.id.checkBox_str4);

        

        cbox_io[0] = (CheckBox)findViewById(R.id.checkBox_io1);

        cbox_io[1] = (CheckBox)findViewById(R.id.checkBox_io2);

        cbox_io[2] = (CheckBox)findViewById(R.id.checkBox_io3);

        cbox_io[3] = (CheckBox)findViewById(R.id.checkBox_io4);

    }

    

    public void onClick_strButton(View view) {

        tview_io.setText("I/O control:");

        String str = "";

        for (int i = 0; i < 4; i++) {

            if(cbox_str[i].isChecked())

                str += "1";

            else

                str += "0";

        }

        tview_str.setText("Leds :" + str);

        strLeds(str);

    }

    

    public void onClick_ioButton(View view) {

        tview_str.setText("I/O control:");

        String str = "";

        for (int i = 0; i < 4; i++) {

            if(cbox_io[i].isChecked()) {

                ioLeds(1, i);

                str += "1";

            } else {  

                ioLeds(0, i);

                str += "0";

            }

        }

        tview_io.setText("Leds :" + str);

    }

    

    public native void strLeds(String str);

    public native void ioLeds(int cmd, int arg);

    

    static {

        System.loadLibrary("ledsjni");

    }



    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }



}

　　4、ledsjni.h

/* DO NOT EDIT THIS FILE - it is machine generated */

#include <jni.h>

/* Header for class com_example_ledsjni_MainActivity */



#ifndef _Included_com_example_ledsjni_MainActivity

#define _Included_com_example_ledsjni_MainActivity

#ifdef __cplusplus

extern "C" {

#endif

/*

 * Class:     com_example_ledsjni_MainActivity

 * Method:    strLeds

 * Signature: (Ljava/lang/String;)V

 */

JNIEXPORT void JNICALL Java_com_example_ledsjni_MainActivity_strLeds

  (JNIEnv *, jobject, jstring);



/*

 * Class:     com_example_ledsjni_MainActivity

 * Method:    ioLeds

 * Signature: (II)V

 */

JNIEXPORT void JNICALL Java_com_example_ledsjni_MainActivity_ioLeds

  (JNIEnv *, jobject, jint, jint);



#ifdef __cplusplus

}

#endif

#endif

　　5、ledsjni.cpp

#include <jni.h>

#include <string.h>

#include <fcntl.h>

#include <stdio.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <stdlib.h>



#include "ledsjni.h"



char* jstring_to_pchar(JNIEnv* env, jstring str)

{

    char* pstr = NULL;

    jclass clsstring = env->FindClass("java/lang/String");

    jstring strencode = env->NewStringUTF("utf-8");

    jmethodID mid = env->GetMethodID(clsstring, "getBytes", "(Ljava/lang/String;)[B");

    jbyteArray byteArray = (jbyteArray)(env->CallObjectMethod(str, mid, strencode));

    jsize size = env->GetArrayLength(byteArray);

    jbyte* pbyte = env->GetByteArrayElements(byteArray, JNI_FALSE);

    if (size > 0) {

        pstr = (char*) malloc(size);

        memcpy(pstr, pbyte, size);

    }

    return pstr;

}





JNIEXPORT void JNICALL Java_com_example_ledsjni_MainActivity_strLeds

  (JNIEnv* env, jobject thiz, jstring str)

{

    int fd_leds;

    fd_leds = open("/dev/s3c6410_leds", O_WRONLY);

    char* pstr = jstring_to_pchar(env, str);

    if (pstr != NULL) {

        write(fd_leds, pstr, strlen(pstr));

    }



    close(fd_leds);

}



JNIEXPORT void JNICALL Java_com_example_ledsjni_MainActivity_ioLeds

  (JNIEnv* env, jobject thiz, jint cmd, jint arg)

{

    int fd_leds;

    fd_leds = open("/dev/s3c6410_leds", O_WRONLY);

    ioctl(fd_leds, cmd, arg);



    close(fd_leds);

}

　　That's all about the ledsjni and leds device driver.