TermApp/app/src/main/cpp/SerialComm.cpp

#include <jni.h>
#include <string>

#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>
#include <android/log.h>
#include <stdio.h>
#include <dirent.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <termios.h>
#include <time.h>
#include "GPIOControl.h"
#include "SerialComm.h"


static void set_baudrate (struct termios *opt, unsigned int baudrate)
{
    cfsetispeed(opt, baudrate);
    cfsetospeed(opt, baudrate);
}

static void set_data_bit (struct termios *opt, unsigned int databit)
{
    opt->c_cflag &= ~CSIZE;
    switch (databit)
    {
        case 8:
            opt->c_cflag |= CS8;
            break;
        case 7:
            opt->c_cflag |= CS7;
            break;
        case 6:
            opt->c_cflag |= CS6;
            break;
        case 5:
            opt->c_cflag |= CS5;
            break;
        default:
            opt->c_cflag |= CS8;
            break;
    }
}

static void set_parity (struct termios *opt, char parity)
{
    switch (parity)
    {
        case'N':/* 无校验 */
        case 'n':
            opt->c_cflag &= ~PARENB;
            break;
        case'E':/*偶校验*/
        case 'e':
            opt->c_cflag |= PARENB;
            opt->c_cflag &= ~PARODD;
            break;
        case'O':/* 奇校验 */
        case 'o':
            opt->c_cflag |= PARENB;
            opt->c_cflag |= ~PARODD;
            break;
        default: /*其它选择为无校验 */
            opt->c_cflag &= ~PARENB;
            break;
    }
}

static void set_stopbit (struct termios *opt, const int stopbit)
{
    switch (stopbit)
    {
        case 10:
            opt->c_cflag &= ~CSTOPB;/*1 位停止位 t */
            break;
        case 15:
            opt->c_cflag &= ~CSTOPB;/*1.5 位停止位 */
            break;
        case 20:
            opt->c_cflag |= CSTOPB; /*2 位停止位 */
            break;
        default:
            opt->c_cflag &= ~CSTOPB; /*1 位停止位 */
            break;
    }
}

int set_port_attr (int fd, unsigned int baudrate, int databit, const int stopbit, char parity, int vtime, int vmin )
{
    struct termios opt;
    tcgetattr(fd, &opt);
    set_baudrate(&opt, baudrate);
    //opt.c_cflag |= CLOCAL|CREAD; /*|CRTSCTS */
    opt.c_lflag &= ~(ICANON | ECHO |ECHOE |ISIG);
    set_data_bit(&opt, databit);
    set_parity(&opt, parity);
    set_stopbit(&opt, stopbit);
    opt.c_iflag &=~(INLCR|ICRNL);
    opt.c_iflag &=~(IXON);/* 流控*/
    opt.c_oflag = 0;
    //opt.c_lflag |= 0;
    opt.c_oflag &= ~OPOST;
    opt.c_cc[VTIME] = vtime;
    opt.c_cc[VMIN] = vmin;
    tcflush (fd, TCIFLUSH);
    return (tcsetattr (fd, TCSANOW, &opt));
}