[RK3399][Android7.1] 除錯筆記 --- 串列埠JNI測試用例
阿新 • • 發佈：2019-01-06
Platform: RK3399
OS: Android 7.1
Kernel: v4.4.83
有將它修改做了實現，也分享給大家做參考。
JNI部分：
SerialPort.c
/*
* Copyright 2009-2011 Cedric Priscal
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of SerialPort.h
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class android_serialport_api_SerialPort */
#ifndef _Included_android_serialport_api_SerialPort
#define _Included_android_serialport_api_SerialPort
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: android_serialport_api_SerialPort
* Method: open
* Signature: (Ljava/lang/String;II)Ljava/io/FileDescriptor;
*/
JNIEXPORT jobject JNICALL Java_com_example_serialport_SerialPort_open
(JNIEnv *, jclass, jstring, jint, jint);
/*
* Class: android_serialport_api_SerialPort
* Method: close
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_com_example_serialport_SerialPort_close
(JNIEnv *, jobject);
#ifdef __cplusplus
}
#endif
#endif編譯成so
Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libserialport
LOCAL_SRC_FILES := SerialPort.c
LOCAL_SHARED_LIBRARIES := liblog libcutils
include $(BUILD_SHARED_LIBRARY)測試程式：
Java呼叫JNI部分：
SerialPort.java
package com.example.serialport;
import android.util.Log;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Created by kris on 8/16/18.
*/
public class SerialPort {
private static final String TAG = "SerialPort";
private FileDescriptor mFd;
private FileInputStream mFileInputStream;
private FileOutputStream mFileOutputStream;
public void onDataReceived(final byte[] buffer, final int size) {
//事件處理很多或者耗時的話可以開個執行緒
/* new Thread(new Runnable() {
@Override
public void run() {
//do sth.
Log.i(TAG, "onDataReceived: ");
}
}).start();*/
}
// protected abstract void onDataReceived(final byte[] buffer, final int size);
public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException {
mFd = open(device.getAbsolutePath(), baudrate, flags);
if (mFd == null) {
Log.e(TAG, "native open returns null");
throw new IOException();
}
mFileInputStream = new FileInputStream(mFd);
mFileOutputStream = new FileOutputStream(mFd);
//開一個執行緒實時接收串列埠資料
new Thread(new Runnable() {
@Override
public void run() {
while (true) {
int size;
try {
byte[] buffer = new byte[64];
if (mFileInputStream == null) return;
size = mFileInputStream.read(buffer);
//資料處理
onDataReceived(buffer, size);
} catch (IOException e) {
e.printStackTrace();
return;
}
}
}
}).start();
}
public int Send(final byte[] buffer, final int size)
{
try {
if (mFileOutputStream != null) {
mFileOutputStream.write(buffer);
} else {
return 0;
}
} catch (IOException e) {
e.printStackTrace();
}
return 1;
}
// Getters and setters
public InputStream getInputStream() {
return mFileInputStream;
}
public OutputStream getOutputStream() {
return mFileOutputStream;
}
// JNI
private native static FileDescriptor open(String path, int baudrate, int flags);
public native void close();
static {
System.loadLibrary("serialport");
}
}開啟串列埠
ExternalDevices.java
package com.example.serialport;
import java.io.File;
import java.io.IOException;
/**
* Created by kris on 8/20/18.
*/
public class ExternalDevices {
private static final String TAG = "ExternalDevices";
public SerialPort mSerialPort = null;
public ExternalDevices()
{
try {
mSerialPort = new SerialPort(new File("/dev/ttyS4"), 115200, 0);
}catch (IOException e){}
}
}