AS SerialPort 编译依赖库
一.
1.1.新建工程 选择Native C++
1.1.
a.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 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.
*/
#include <termios.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <jni.h>
#include "SerialPort.h"
#include "android/log.h"
static const char *TAG="serial_port";
#define LOGI(fmt, args...) __android_log_print(ANDROID_LOG_INFO, TAG, fmt, ##args)
#define LOGD(fmt, args...) __android_log_print(ANDROID_LOG_DEBUG, TAG, fmt, ##args)
#define LOGE(fmt, args...) __android_log_print(ANDROID_LOG_ERROR, TAG, fmt, ##args)
int fd;
int xh_baudrate;
#define TIOCSRS485 0x542F
struct xh_serial_rs485
{
unsigned long flags; /* RS485 feature flags */
unsigned long delay_rts_before_send; /* Delay before send (milliseconds) */
unsigned long delay_rts_after_send; /* Delay after send (milliseconds) */
};
static speed_t getBaudrate(jint baudrate)
{
switch(baudrate) {
case 0: return B0;
case 50: return B50;
case 75: return B75;
case 110: return B110;
case 134: return B134;
case 150: return B150;
case 200: return B200;
case 300: return B300;
case 600: return B600;
case 1200: return B1200;
case 1800: return B1800;
case 2400: return B2400;
case 4800: return B4800;
case 9600: return B9600;
case 19200: return B19200;
case 38400: return B38400;
case 57600: return B57600;
case 115200: return B115200;
case 230400: return B230400;
case 460800: return B460800;
case 500000: return B500000;
case 576000: return B576000;
case 921600: return B921600;
case 1000000: return B1000000;
case 1152000: return B1152000;
case 1500000: return B1500000;
case 2000000: return B2000000;
case 2500000: return B2500000;
case 3000000: return B3000000;
case 3500000: return B3500000;
case 4000000: return B4000000;
default: return -1;
}
}
/**
* 设置串口数据，校验位,速率，停止位
* @param nBits 类型 int数据位 取值 位7或8
* @param nEvent 类型 char 校验类型 取值N ,E, O,,S
* @param mStop 类型 int 停止位 取值1 或者 2
*/
int set_opt(jint nBits, jchar nEvent, jint nStop,jint baudrate)
{
LOGE("set_opt:nBits=%d,nEvent=%c,nStop=%d", nBits, nEvent, nStop);
struct termios newtio;
speed_t speed;
if(tcgetattr(fd, & newtio) != 0)
{
LOGE("setup serial failure");
return -1;
}
/*波特率 */
{
speed = getBaudrate(baudrate);
if (speed == -1)
{
/* TODO: throw an exception */
LOGE("Invalid baudrate");
return NULL;
}
}
bzero( & newtio, sizeof(newtio));
//c_cflag标志可以定义CLOCAL和CREAD，这将确保该程序不被其他端口控制和信号干扰，同时串口驱动将读取进入的数据。CLOCAL和CREAD通常总是被是能的
newtio.c_cflag |= CLOCAL | CREAD;
cfmakeraw(&newtio);
//设置波特率
cfsetispeed(&newtio, speed);
cfsetospeed(&newtio, speed);
switch(nBits) //设置数据位数
{
case 7:
newtio.c_cflag &= ~CSIZE;
newtio.c_cflag |= CS7;
break;
case 8:
newtio.c_cflag &= ~CSIZE;
newtio.c_cflag |= CS8;
break;
default:
break;
}
switch(nEvent) //设置校验位
{
case 'O':
newtio.c_cflag |= PARENB; //enable parity checking
newtio.c_cflag |= PARODD; //奇校验位
newtio.c_iflag |= (INPCK );
break;
case 'E':
newtio.c_cflag |= PARENB; //
newtio.c_cflag &= ~PARODD; //偶校验位
newtio.c_iflag |= (INPCK);
break;
case 'N':
newtio.c_cflag &= ~PARENB; //清除校验位
break;
default:
break;
}
newtio.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /*Input*/
newtio.c_oflag &= ~OPOST; /*Output*/
switch(nStop) //设置停止位
{
case 1:
newtio.c_cflag &= ~CSTOPB;
break;
case 2:
newtio.c_cflag |= CSTOPB;
break;
default:
// LOGW("nStop:%d,invalid param", nStop);
break;
}
newtio.c_cc[VTIME] = 100;//设置等待时间
newtio.c_cc[VMIN] = 0;//设置最小接收字符
tcflush(fd, TCIFLUSH);
if(tcsetattr(fd, TCSANOW, & newtio) != 0)
{
LOGE("options set error");
return -1;
}
LOGE("options set success");
return 1;
}
/*
* Class: android_serialport_SerialPort
* Method: open
* Signature: (Ljava/lang/String;II)Ljava/io/FileDescriptor;
*/
JNIEXPORT jobject JNICALL Java_android_1serialport_1api_SerialPort_open
(JNIEnv *env, jclass thiz, jstring path, jint baudrate,
jint databits, jint stopbits, jchar parity)
{
LOGE("Java_android_1serialport_1api_SerialPort_open\n");
jobject mFileDescriptor;
speed_t speed;
xh_baudrate=baudrate;
/* Check arguments */
{
speed = getBaudrate(baudrate);
if (speed == -1) {
/* TODO: throw an exception */
LOGE("Invalid baudrate");
return NULL;
}
}
/* Opening device */
{
jint flags = 0;
jboolean iscopy;
const char *path_utf = (*env)->GetStringUTFChars(env, path, &iscopy);
LOGD("Opening serial port %s with flags 0x%x", path_utf, O_RDWR | flags);
fd = open(path_utf, O_RDWR | O_NONBLOCK);
//fd=fd;
LOGD("open() fd = %d", fd);
(*env)->ReleaseStringUTFChars(env, path, path_utf);
if (fd == -1)
{
/* Throw an exception */
LOGE("Cannot open port");
/* TODO: throw an exception */
return NULL;
}
}
/* Configure device */
{
struct termios cfg;
LOGD("Configuring serial port");
if (tcgetattr(fd, &cfg))
{
LOGE("tcgetattr() failed");
close(fd);
/* TODO: throw an exception */
return NULL;
}
cfmakeraw(&cfg);
cfsetispeed(&cfg, speed);
cfsetospeed(&cfg, speed);
if (tcsetattr(fd, TCSANOW, &cfg))
{
LOGE("tcsetattr() failed");
close(fd);
/* TODO: throw an exception */
return NULL;
}
}
//配置校验位 停止位等等
//set_opt(databits, parity, stopbits,baudrate);
/* Create a corresponding file descriptor */
{
jclass cFileDescriptor = (*env)->FindClass(env, "java/io/FileDescriptor");
jmethodID iFileDescriptor = (*env)->GetMethodID(env, cFileDescriptor, "<init>", "()V");
jfieldID descriptorID = (*env)->GetFieldID(env, cFileDescriptor, "descriptor", "I");
mFileDescriptor = (*env)->NewObject(env, cFileDescriptor, iFileDescriptor);
(*env)->SetIntField(env, mFileDescriptor, descriptorID, (jint)fd);
}
return mFileDescriptor;
}
/*
* Class: cedric_serial_SerialPort
* Method: close
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_android_1serialport_1api_SerialPort_close
(JNIEnv *env, jobject thiz)
{
jclass SerialPortClass = (*env)->GetObjectClass(env, thiz);
jclass FileDescriptorClass = (*env)->FindClass(env, "java/io/FileDescriptor");
jfieldID mFdID = (*env)->GetFieldID(env, SerialPortClass, "mFd", "Ljava/io/FileDescriptor;");
jfieldID descriptorID = (*env)->GetFieldID(env, FileDescriptorClass, "descriptor", "I");
jobject mFd = (*env)->GetObjectField(env, thiz, mFdID);
jint descriptor = (*env)->GetIntField(env, mFd, descriptorID);
LOGD("close(fd = %d)", descriptor);
close(descriptor);
}
/*
* Class: cedric_serial_SerialPort
* Method: close
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_android_1serialport_1api_SerialPort_write_1rs485_1length
(JNIEnv *env, jobject thiz, jint count)
{
struct xh_serial_rs485 rs485conf;
LOGD("count= %d xh_baudrate = %d \n", count,xh_baudrate);
rs485conf.delay_rts_after_send = ((10 * count * 1000 ) / xh_baudrate) + 1 ;
ioctl (fd, TIOCSRS485, &rs485conf);
}
b.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_android_1serialport_1api_SerialPort_open
(JNIEnv *, jclass, jstring, jint, jint,jint,jchar);
/*
* Class: android_serialport_api_SerialPort
* Method: close
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_android_1serialport_1api_SerialPort_close
(JNIEnv *, jobject);
JNIEXPORT void JNICALL Java_android_1serialport_1api_SerialPort_write_rs485_length
(JNIEnv *, jint);
#ifdef __cplusplus
}
#endif
#endif
c.CMakeLists.txt
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.10.2)
# Declares and names the project.
project("serialport")
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
SerialPort
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
SerialPort.c)
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log)
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
SerialPort
# Links the target library to the log library
# included in the NDK.
${log-lib})
E:\GatsbyDevelop\AndroidStuido\GatsbyASCode\GSerialPort\app\build\intermediates\cmake\debug\obj\arm64-v8a 下生成so文件
工程
1.3.
android_serialport_api
a.SerialPort.java 这个类主要用来加载SO文件 通过JNI的方式打开关闭串口
package android_serialport_api;
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;
public class SerialPort {
private static final String TAG = "SerialPort";
/*
* Do not remove or rename the field mFd: it is used by native method close();
*/
private FileDescriptor mFd;
private FileInputStream mFileInputStream;
private FileOutputStream mFileOutputStream;
public SerialPort(File device, int baudrate, int dataBits, int stopBits, char parity) throws SecurityException, IOException {
/* Check access permission */
if (!device.canRead() || !device.canWrite()) {
try {
/* Missing read/write permission, trying to chmod the file */
Process su;
su = Runtime.getRuntime().exec("/system/bin/su");
String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
+ "exit\n";
su.getOutputStream().write(cmd.getBytes());
if ((su.waitFor() != 0) || !device.canRead()
|| !device.canWrite()) {
throw new SecurityException();
}
} catch (Exception e) {
e.printStackTrace();
throw new SecurityException();
}
}
mFd = open(device.getAbsolutePath(), baudrate, dataBits, stopBits, parity);
if (mFd == null) {
Log.e(TAG, "native open returns null");
throw new IOException();
}
mFileInputStream = new FileInputStream(mFd);
mFileOutputStream = new FileOutputStream(mFd);
}
// Getters and setters
public InputStream getInputStream() {
return mFileInputStream;
}
public OutputStream getOutputStream() {
return mFileOutputStream;
}
public void Write_Rs485_Length(int count) {
write_rs485_length(count);
}
// JNI(调用java本地接口，实现串口的打开和关闭)
/**串口有五个重要的参数：串口设备名，波特率，检验位，数据位，停止位
其中检验位一般默认位NONE,数据位一般默认为8，停止位默认为1*/
/**
* @param path 串口设备的据对路径
* @param baudrate 波特率
* @param dataBits 数据位
* @param stopBits 停止位
* @param parity 校验位
*/
private native static FileDescriptor open(String path, int baudrate, int dataBits, int stopBits, char parity);
public native void close();
public native void write_rs485_length(int count);
static {//加载jni下的C文件库
System.loadLibrary("serial_port");
}
}
b.SerialPortFinder.java
/*
* 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 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.
*/
#include <termios.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <jni.h>
#include "SerialPort.h"
#include "android/log.h"
static const char *TAG="serial_port";
#define LOGI(fmt, args...) __android_log_print(ANDROID_LOG_INFO, TAG, fmt, ##args)
#define LOGD(fmt, args...) __android_log_print(ANDROID_LOG_DEBUG, TAG, fmt, ##args)
#define LOGE(fmt, args...) __android_log_print(ANDROID_LOG_ERROR, TAG, fmt, ##args)
int fd;
int xh_baudrate;
#define TIOCSRS485 0x542F
struct xh_serial_rs485
{
unsigned long flags; /* RS485 feature flags */
unsigned long delay_rts_before_send; /* Delay before send (milliseconds) */
unsigned long delay_rts_after_send; /* Delay after send (milliseconds) */
};
static speed_t getBaudrate(jint baudrate)
{
switch(baudrate) {
case 0: return B0;
case 50: return B50;
case 75: return B75;
case 110: return B110;
case 134: return B134;
case 150: return B150;
case 200: return B200;
case 300: return B300;
case 600: return B600;
case 1200: return B1200;
case 1800: return B1800;
case 2400: return B2400;
case 4800: return B4800;
case 9600: return B9600;
case 19200: return B19200;
case 38400: return B38400;
case 57600: return B57600;
case 115200: return B115200;
case 230400: return B230400;
case 460800: return B460800;
case 500000: return B500000;
case 576000: return B576000;
case 921600: return B921600;
case 1000000: return B1000000;
case 1152000: return B1152000;
case 1500000: return B1500000;
case 2000000: return B2000000;
case 2500000: return B2500000;
case 3000000: return B3000000;
case 3500000: return B3500000;
case 4000000: return B4000000;
default: return -1;
}
}
/**
* 设置串口数据，校验位,速率，停止位
* @param nBits 类型 int数据位 取值 位7或8
* @param nEvent 类型 char 校验类型 取值N ,E, O,,S
* @param mStop 类型 int 停止位 取值1 或者 2
*/
int set_opt(jint nBits, jchar nEvent, jint nStop,jint baudrate)
{
LOGE("set_opt:nBits=%d,nEvent=%c,nStop=%d", nBits, nEvent, nStop);
struct termios newtio;
speed_t speed;
if(tcgetattr(fd, & newtio) != 0)
{
LOGE("setup serial failure");
return -1;
}
/*波特率 */
{
speed = getBaudrate(baudrate);
if (speed == -1)
{
/* TODO: throw an exception */
LOGE("Invalid baudrate");
return NULL;
}
}
bzero( & newtio, sizeof(newtio));
//c_cflag标志可以定义CLOCAL和CREAD，这将确保该程序不被其他端口控制和信号干扰，同时串口驱动将读取进入的数据。CLOCAL和CREAD通常总是被是能的
newtio.c_cflag |= CLOCAL | CREAD;
cfmakeraw(&newtio);
//设置波特率
cfsetispeed(&newtio, speed);
cfsetospeed(&newtio, speed);
switch(nBits) //设置数据位数
{
case 7:
newtio.c_cflag &= ~CSIZE;
newtio.c_cflag |= CS7;
break;
case 8:
newtio.c_cflag &= ~CSIZE;
newtio.c_cflag |= CS8;
break;
default:
break;
}
switch(nEvent) //设置校验位
{
case 'O':
newtio.c_cflag |= PARENB; //enable parity checking
newtio.c_cflag |= PARODD; //奇校验位
newtio.c_iflag |= (INPCK );
break;
case 'E':
newtio.c_cflag |= PARENB; //
newtio.c_cflag &= ~PARODD; //偶校验位
newtio.c_iflag |= (INPCK);
break;
case 'N':
newtio.c_cflag &= ~PARENB; //清除校验位
break;
default:
break;
}
newtio.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /*Input*/
newtio.c_oflag &= ~OPOST; /*Output*/
switch(nStop) //设置停止位
{
case 1:
newtio.c_cflag &= ~CSTOPB;
break;
case 2:
newtio.c_cflag |= CSTOPB;
break;
default:
// LOGW("nStop:%d,invalid param", nStop);
break;
}
newtio.c_cc[VTIME] = 100;//设置等待时间
newtio.c_cc[VMIN] = 0;//设置最小接收字符
tcflush(fd, TCIFLUSH);
if(tcsetattr(fd, TCSANOW, & newtio) != 0)
{
LOGE("options set error");
return -1;
}
LOGE("options set success");
return 1;
}
/*
* Class: android_serialport_SerialPort
* Method: open
* Signature: (Ljava/lang/String;II)Ljava/io/FileDescriptor;
*/
JNIEXPORT jobject JNICALL Java_android_1serialport_1api_SerialPort_open
(JNIEnv *env, jclass thiz, jstring path, jint baudrate,
jint databits, jint stopbits, jchar parity)
{
LOGE("Java_android_1serialport_1api_SerialPort_open\n");
jobject mFileDescriptor;
speed_t speed;
xh_baudrate=baudrate;
/* Check arguments */
{
speed = getBaudrate(baudrate);
if (speed == -1) {
/* TODO: throw an exception */
LOGE("Invalid baudrate");
return NULL;
}
}
/* Opening device */
{
jint flags = 0;
jboolean iscopy;
const char *path_utf = (*env)->GetStringUTFChars(env, path, &iscopy);
LOGD("Opening serial port %s with flags 0x%x", path_utf, O_RDWR | flags);
fd = open(path_utf, O_RDWR | O_NONBLOCK);
//fd=fd;
LOGD("open() fd = %d", fd);
(*env)->ReleaseStringUTFChars(env, path, path_utf);
if (fd == -1)
{
/* Throw an exception */
LOGE("Cannot open port");
/* TODO: throw an exception */
return NULL;
}
}
/* Configure device */
{
struct termios cfg;
LOGD("Configuring serial port");
if (tcgetattr(fd, &cfg))
{
LOGE("tcgetattr() failed");
close(fd);
/* TODO: throw an exception */
return NULL;
}
cfmakeraw(&cfg);
cfsetispeed(&cfg, speed);
cfsetospeed(&cfg, speed);
if (tcsetattr(fd, TCSANOW, &cfg))
{
LOGE("tcsetattr() failed");
close(fd);
/* TODO: throw an exception */
return NULL;
}
}
//配置校验位 停止位等等
//set_opt(databits, parity, stopbits,baudrate);
/* Create a corresponding file descriptor */
{
jclass cFileDescriptor = (*env)->FindClass(env, "java/io/FileDescriptor");
jmethodID iFileDescriptor = (*env)->GetMethodID(env, cFileDescriptor, "<init>", "()V");
jfieldID descriptorID = (*env)->GetFieldID(env, cFileDescriptor, "descriptor", "I");
mFileDescriptor = (*env)->NewObject(env, cFileDescriptor, iFileDescriptor);
(*env)->SetIntField(env, mFileDescriptor, descriptorID, (jint)fd);
}
return mFileDescriptor;
}
/*
* Class: cedric_serial_SerialPort
* Method: close
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_android_1serialport_1api_SerialPort_close
(JNIEnv *env, jobject thiz)
{
jclass SerialPortClass = (*env)->GetObjectClass(env, thiz);
jclass FileDescriptorClass = (*env)->FindClass(env, "java/io/FileDescriptor");
jfieldID mFdID = (*env)->GetFieldID(env, SerialPortClass, "mFd", "Ljava/io/FileDescriptor;");
jfieldID descriptorID = (*env)->GetFieldID(env, FileDescriptorClass, "descriptor", "I");
jobject mFd = (*env)->GetObjectField(env, thiz, mFdID);
jint descriptor = (*env)->GetIntField(env, mFd, descriptorID);
LOGD("close(fd = %d)", descriptor);
close(descriptor);
}
/*
* Class: cedric_serial_SerialPort
* Method: close
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_android_1serialport_1api_SerialPort_write_1rs485_1length
(JNIEnv *env, jobject thiz, jint count)
{
struct xh_serial_rs485 rs485conf;
LOGD("count= %d xh_baudrate = %d \n", count,xh_baudrate);
rs485conf.delay_rts_after_send = ((10 * count * 1000 ) / xh_baudrate) + 1 ;
ioctl (fd, TIOCSRS485, &rs485conf);
}
