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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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 the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.hardware;
import android.annotation.UnsupportedAppUsage;
import android.os.ParcelFileDescriptor;
import java.io.FileDescriptor;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* @hide
*/
public class SerialPort {
private static final String TAG = "SerialPort";
// used by the JNI code
@UnsupportedAppUsage
private int mNativeContext;
private final String mName;
private ParcelFileDescriptor mFileDescriptor;
/**
* SerialPort should only be instantiated by SerialManager
* @hide
*/
public SerialPort(String name) {
mName = name;
}
/**
* SerialPort should only be instantiated by SerialManager
* Speed must be one of 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600,
* 19200, 38400, 57600, 115200, 230400, 460800, 500000, 576000, 921600, 1000000, 1152000,
* 1500000, 2000000, 2500000, 3000000, 3500000, 4000000
*
* @hide
*/
public void open(ParcelFileDescriptor pfd, int speed) throws IOException {
native_open(pfd.getFileDescriptor(), speed);
mFileDescriptor = pfd;
}
/**
* Closes the serial port
*/
@UnsupportedAppUsage
public void close() throws IOException {
if (mFileDescriptor != null) {
mFileDescriptor.close();
mFileDescriptor = null;
}
native_close();
}
/**
* Returns the name of the serial port
*
* @return the serial port's name
*/
public String getName() {
return mName;
}
/**
* Reads data into the provided buffer.
* Note that the value returned by {@link java.nio.Buffer#position()} on this buffer is
* unchanged after a call to this method.
*
* @param buffer to read into
* @return number of bytes read
*/
public int read(ByteBuffer buffer) throws IOException {
if (buffer.isDirect()) {
return native_read_direct(buffer, buffer.remaining());
} else if (buffer.hasArray()) {
return native_read_array(buffer.array(), buffer.remaining());
} else {
throw new IllegalArgumentException("buffer is not direct and has no array");
}
}
/**
* Writes data from provided buffer.
* Note that the value returned by {@link java.nio.Buffer#position()} on this buffer is
* unchanged after a call to this method.
*
* @param buffer to write
* @param length number of bytes to write
*/
@UnsupportedAppUsage
public void write(ByteBuffer buffer, int length) throws IOException {
if (buffer.isDirect()) {
native_write_direct(buffer, length);
} else if (buffer.hasArray()) {
native_write_array(buffer.array(), length);
} else {
throw new IllegalArgumentException("buffer is not direct and has no array");
}
}
/**
* Sends a stream of zero valued bits for 0.25 to 0.5 seconds
*/
public void sendBreak() {
native_send_break();
}
private native void native_open(FileDescriptor pfd, int speed) throws IOException;
private native void native_close();
private native int native_read_array(byte[] buffer, int length) throws IOException;
private native int native_read_direct(ByteBuffer buffer, int length) throws IOException;
private native void native_write_array(byte[] buffer, int length) throws IOException;
private native void native_write_direct(ByteBuffer buffer, int length) throws IOException;
private native void native_send_break();
}
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