serial.cpp
//包含头文件
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifndef _WIN32
#include <sys/ioctl.h>
#include <unistd.h>
#include <termios.h>
#else
#include <io.h>
#pragma warning (disable:4996)
#endif
#include <errno.h>
#include <string.h>
#include <time.h>
int fd_ = -1;
extern "C" {
int set_opt(int fd, int nSpeed, int nBits, char nEvent, int nStop, int min_btye);
}
long long getMilisec()
{
#ifndef _WIN32
struct timeval now;
gettimeofday(&now, NULL);
long long t_mili = ((long long)now.tv_sec) * 1000 + now.tv_usec / 1000;
return t_mili;
#else
return 0;
#endif
}
//打印
//#include "android/log.h"
//static const char *TAG = "HelloWorldScene";
//#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)
extern "C" {
bool Serial_Open()
{
if (fd_ > 0)//already open
return true;
#ifndef _WIN32
//char *dev[] = { "/dev/ttySAC0", "/dev/ttySAC1", "/dev/ttySAC2", "/dev/ttySAC3" };
//long vdisable;
fd_ = open("/dev/ttyS4", O_RDWR | O_NOCTTY | O_NDELAY);
if (fd_ == -1) {
return false;
}
//LOGE("Open Serial Port %s\n",dev[comport]);
//恢复串口为阻塞状态
if (fcntl(fd_, F_SETFL, 0) < 0) {
return false;
}
/*测试是否为终端设备*/
if (isatty(STDIN_FILENO) == 0) {
//LOGE("standard input is not a terminal device\n");
}
set_opt(fd_, 9600, 8, 'N', 1, 200);
#else
fd_ = open("/dev/ttyS4", O_RDWR);
if (fd_ == -1) {
return false;
}
#endif
return fd_ > 0;
}
void Serial_Close()
{
if (fd_ > 0)
{
close(fd_);
fd_ = -1;
}
}
int Serial_SendData(const unsigned char* data, int size)
{
if (fd_ < 0)//not open
return -1;
int ret = write(fd_, data, size);
return ret;
}
int Serial_RecvData(unsigned char* buff, int len)
{
if (fd_ < 0)//not open
return -1;
memset(buff, 0, len);
int readSize = read(fd_, buff, len);
return readSize;
}
/*****************************
* 功能：设置串口函数
* 入口：（fd，波特率，数据位，奇偶校验，停止位）
*****************************/
int set_opt(int fd, int nSpeed, int nBits, char nEvent, int nStop, int min_btye)
{
#ifndef _WIN32
struct termios newtio, oldtio;
/*保存测试现有串口参数设置，在这里如果串口号出错，会有相关的出错信息*/
if (tcgetattr(fd, &oldtio) != 0) {
// LOGE("SetupSerial 1");
return -1;
}
bzero(&newtio, sizeof(newtio));
/*步骤一：设置字符大小*/
newtio.c_cflag |= CLOCAL | CREAD;
newtio.c_cflag &= ~CSIZE;
/*设置停止位*/
switch (nBits) {
case 7: newtio.c_cflag |= CS7;
break;
case 8: newtio.c_cflag |= CS8;
break;
}
/*设置奇偶校验位*/
switch (nEvent) {
case 'O': //奇数
newtio.c_cflag |= PARENB;
newtio.c_cflag |= PARODD;
newtio.c_iflag |= (INPCK | ISTRIP);
break;
case 'E': //偶数
newtio.c_iflag |= (INPCK | ISTRIP);
newtio.c_cflag |= PARENB;
newtio.c_cflag &= ~PARODD;
break;
case 'N': //无奇偶校验位
newtio.c_cflag &= ~PARENB;
break;
}
/*设置波特率*/
switch (nSpeed)
{
case 2400:
cfsetispeed(&newtio, B2400);
cfsetospeed(&newtio, B2400);
break;
case 4800:
cfsetispeed(&newtio, B4800);
cfsetospeed(&newtio, B4800);
break;
case 9600:
cfsetispeed(&newtio, B9600);
cfsetospeed(&newtio, B9600);
break;
case 19200:
cfsetispeed(&newtio, B19200);
cfsetospeed(&newtio, B19200);
break;
case 115200:
cfsetispeed(&newtio, B115200);
cfsetospeed(&newtio, B115200);
break;
case 460800:
cfsetispeed(&newtio, B460800);
cfsetospeed(&newtio, B460800);
break;
default:
cfsetispeed(&newtio, B115200);
cfsetospeed(&newtio, B115200);
break;
}
/*设置停止位*/
if (nStop == 1) {
newtio.c_cflag &= ~CSTOPB;
}
else if (nStop == 2) {
newtio.c_cflag |= CSTOPB;
}
/*设置等待时间和最小接收字符*/
newtio.c_cc[VTIME] = 1;
newtio.c_cc[VMIN] = min_btye;
/*处理未接收字符*/
tcflush(fd, TCIFLUSH);
/*激活新配置*/
if ((tcsetattr(fd, TCSANOW, &newtio)) != 0) {
// LOGE("COM set error\n");
return -1;
}
#endif
return 0;
}
}Android.mk
#
# Copyright 2009 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.
#
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
NDK_TOOLCHAIN_VERSION := 4.9
LOCAL_C_INCLUDES := C:/android-ndk-r15b/sources/cxx-stl/gnu-libstdc++/4.9/include
LOCAL_C_INCLUDES +=C:\android-ndk-r15b\sources\cxx-stl\gnu-libstdc++\4.9\libs\armeabi\include
TARGET_PLATFORM := android-18
LOCAL_MODULE := serialport
LOCAL_SRC_FILES := serial.cpp
LOCAL_LDLIBS := -llog
LOCAL_CPPFLAGS := -std=c++11 -D __cplusplus=201103L
APP_STL := gnustl_shared
APP_CPPFLAGS := -std=c++11 -frtti -fexceptions
APP_CPPFLAGS += -std=gun++11 -lpthread
include $(BUILD_SHARED_LIBRARY)Application.mk
APP_ABI := armeabi armeabi-v7a x86离线
ndk 编译参考: https://www.jianshu.com/p/708e6bf68ae9
离线