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.
