android 串口开发_安卓NDK串口通信
时间: 2023-08-16 19:09:20 浏览: 137
基于Android平台的串口通信实现
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好的,关于Android NDK串口通信的开发,我可以给您提供一些参考。在Android中,串口通信需要使用JNI(Java Native Interface)来调用C/C++代码来实现。下面是一个简单的流程:
1.编写C/C++代码实现串口通信,可以使用Linux系统提供的串口通信函数,如open、read、write等。
2.将C/C++代码编译为动态库(.so文件),可以使用NDK的工具链来进行编译。
3.在Java代码中使用JNI调用动态库中的函数,实现串口通信。
以下是一个简单的示例代码,仅供参考:
C/C++代码(SerialPort.cpp):
```c++
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>
int fd;
int openPort(char* portName, int baudRate)
{
struct termios options;
fd = open(portName, O_RDWR | O_NOCTTY | O_NDELAY);
if (fd == -1) {
perror("openPort: Unable to open serial port - ");
return -1;
}
fcntl(fd, F_SETFL, FNDELAY);
tcgetattr(fd, &options);
cfsetispeed(&options, baudRate);
cfsetospeed(&options, baudRate);
options.c_cflag |= (CLOCAL | CREAD);
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8;
tcsetattr(fd, TCSANOW, &options);
return fd;
}
void closePort()
{
close(fd);
}
int readData(char* buffer, int length)
{
int n = read(fd, buffer, length);
return n;
}
int writeData(char* buffer, int length)
{
int n = write(fd, buffer, length);
return n;
}
```
Java代码:
```java
public class SerialPort {
static {
System.loadLibrary("serial_port");
}
public static native int openPort(String portName, int baudRate);
public static native void closePort();
public static native int readData(byte[] buffer, int length);
public static native int writeData(byte[] buffer, int length);
}
```
调用示例:
```java
int fd = SerialPort.openPort("/dev/ttyS1", 9600);
byte[] buffer = new byte[1024];
int n = SerialPort.readData(buffer, buffer.length);
SerialPort.writeData(buffer, n);
SerialPort.closePort();
```
需要注意的是,在AndroidManifest.xml文件中,需要添加以下权限:
```xml
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.FLASHLIGHT"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY"/>
<uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS"/>
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.NFC"/>
<uses-permission android:name="android.permission.READ_CONTACTS"/>
<uses-permission android:name="android.permission.WRITE_CONTACTS"/>
<uses-permission android:name="android.permission.READ_CALENDAR"/>
<uses-permission android:name="android.permission.WRITE_CALENDAR"/>
<uses-permission android:name="android.permission.RECORD_VIDEO"/>
<uses-permission android:name="android.permission.READ_SMS"/>
<uses-permission android:name="android.permission.RECEIVE_SMS"/>
<uses-permission android:name="android.permission.SEND_SMS"/>
<uses-permission android:name="android.permission.CALL_PHONE"/>
<uses-permission android:name="android.permission.READ_CALL_LOG"/>
<uses-permission android:name="android.permission.WRITE_CALL_LOG"/>
<uses-permission android:name="android.permission.USE_SIP"/>
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>
<uses-permission android:name="android.permission.ADD_VOICEMAIL"/>
<uses-permission android:name="android.permission.USE_FINGERPRINT"/>
<uses-permission android:name="android.permission.BODY_SENSORS"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
```
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