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Android串口通信实例分析【附源码】
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Android 串口通信實例分析，用的時開源的android-serialport-api
這個是用android ndk實現的串口通信，我把他做了一個簡化，適合于一般的程序的串口通信移植，歡迎拍磚～～～～～～～～～
先說jni接口吧，原本文件太多，其實只需要SerialPort.c和Android.mk就可以實現
Serialport.c
#include?????<stdio.h>??#include?????<stdlib.h>??#include?????<unistd.h>??#include?????<sys/types.h>??#include?????<sys/stat.h>??#include?????<fcntl.h>??#include?????<termios.h>??#include?????<errno.h>??#include?????<jni.h>??#include?????<android/log.h>????#define?LOGI(...)?((void)__android_log_print(ANDROID_LOG_INFO,?"",?__VA_ARGS__))????????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;??????}??}??????????????JNIEXPORT?jobject?JNICALL?Java_com_huangcheng_serial_SerialPort_open????(JNIEnv?*env,?jclass?thiz,?jstring?path,?jint?baudrate,?jint?flags)??{??????int?fd;??????speed_t?speed;??????jobject?mFileDescriptor;??????????????{??????????speed?=?getBaudrate(baudrate);??????????if?(speed?==?-1)?{????????????????????????????LOGI("Invalid?baudrate");??????????????return?NULL;??????????}??????}??????????????{??????????jboolean?iscopy;??????????const?char?*path_utf?=?(*env)->GetStringUTFChars(env,?path,?&iscopy);??????????LOGI("Opening?serial?port?%s?with?flags?0x%x",?path_utf,?O_RDWR?|?flags);??????????fd?=?open(path_utf,?O_RDWR?|?flags);??????????LOGI("open()?fd?=?%d",?fd);??????????(*env)->ReleaseStringUTFChars(env,?path,?path_utf);??????????if?(fd?==?-1)??????????{????????????????????????????LOGI("Cannot?open?port");????????????????????????????return?NULL;??????????}??????}??????????????{??????????struct?termios?cfg;??????????LOGI("Configuring?serial?port");??????????if?(tcgetattr(fd,?&cfg))??????????{??????????????LOGI("tcgetattr()?failed");??????????????close(fd);????????????????????????????return?NULL;??????????}????????????cfmakeraw(&cfg);??????????cfsetispeed(&cfg,?speed);??????????cfsetospeed(&cfg,?speed);????????????if?(tcsetattr(fd,?TCSANOW,?&cfg))??????????{??????????????LOGI("tcsetattr()?failed");??????????????close(fd);????????????????????????????return?NULL;??????????}??????}??????????????{??????????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;??}????????????JNIEXPORT?void?JNICALL?Java_com_huangcheng_serial_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);????????LOGI("close(fd?=?%d)",?descriptor);??????close(descriptor);??}?
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