struct termios options;
        int   fd   =   -1;
        char *str="jesse is bod boy"";
        fd   =   open("/dev/ttySAC1 ", O_RDWR|O_NONBLOCK|O_NOCTTY);

        tcgetattr(fd,&options);
        cfsetispeed(&options,B9600);
        cfsetospeed(&options,B9600);
        options.c_cflag&=~PARENB;        //Setting parity checking as no parity(8N1)
        options.c_cflag&=~CSTOPB;        //Set stop bit 1
        options.c_cflag|=CS8;            //Select 8 data bits
        tcsetattr(fd,TCSANOW,&options);
        if(fd   !=   -1)
        {
                write(fd,str,strlen(str));
        }
        else
        {
                printf("/dev/ttySAC1  was not ready.\n");
        }
     close(fd);
这个程序特别好！简单、明了
波特率 用标准 9600最好，不然可能数据丢失。
还不快赶紧试试 不明白就记得回个信哦

请问，是不是用arm-linun-gcc -o 命令制作执行文件阿？

是放到QT里面 随便某个函数就行。

cfsetospeed(&options,B115200);

波特率 用标准 9600最好，不然可能数据丢失。

9600？115200？

呵呵，  这都看懂了 ！我原来用的115200 数据老是丢失 ， 大家不一定和我情况一样。我的是usb转comm。我改过来吧？

怎么不编个通过JTAG下载到板子上用的串口通讯程序啊

我也做了一个串口程序，都差不多，但是不知道为什么板子发送没出现问题，接收不是出现了问题，极度无语！直接抄书上的都出现问题，那才是郁闷，谁有接收的代码发个！~

linux下串口编程范例
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <stdlib.h>
int set_opt(int fd,int nSpeed, int nBits, char nEvent, int nStop)
{
/* 五个参量 fd打开文件 speed设置波特率 bit数据位设置   neent奇偶校验位 stop停止位 */
    struct termios newtio,oldtio;
    if ( tcgetattr( fd,&oldtio) != 0) {
        perror("SetupSerial 1");
        return -1;
    }
    bzero( &newtio, sizeof( newtio ) );
    newtio.c_cflag |= CLOCAL | CREAD;
    newtio.c_cflag &= ~CSIZE;
    switch( nBits )
    {
    case 7:
        newtio.c_cflag |= CS7;
    break;
    case 8:
        newtio.c_cflag |= CS8;
    break;
    }
    switch( nEvent )
    {
    case 'O':
        newtio.c_cflag |= PARENB;
        newtio.c_cflag |= PARODD;
        newtio.c_iflag |= (INPCK | ISTRIP);
        break;
    case 'E':
        newtio.c_iflag |= (INPCK | ISTRIP);
        newtio.c_cflag |= PARENB;
        newtio.c_cflag &= ~PARODD;
        break;
    case 'N':
        newtio.c_cflag &= ~PARENB;
        break;
    }
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 115200:
        cfsetispeed(&newtio, B115200);
        cfsetospeed(&newtio, B115200);
        break;
    default:
        cfsetispeed(&newtio, B9600);
        cfsetospeed(&newtio, B9600);
        break;
    }
    if( nStop == 1 )
        newtio.c_cflag &= ~CSTOPB;
    else if ( nStop == 2 )
    newtio.c_cflag |= CSTOPB;
    newtio.c_cc[VTIME] = 0;
    newtio.c_cc[VMIN] = 0;
    tcflush(fd,TCIFLUSH);
    if((tcsetattr(fd,TCSANOW,&newtio))!=0)
    {
        perror("com set error");
        return -1;
    }
    printf("set done!\n");
    return 0;
}
int open_port(int fd,int comport)
{
/* fd 打开串口 comport表示第几个串口 */
    char *dev[]={"/dev/ttyS0","/dev/ttyS1","/dev/ttyS2"};
    long vdisable;
    if (comport==1)
    {    fd = open( "/dev/ttyS0", O_RDWR|O_NOCTTY|O_NDELAY);
        if (-1 == fd){
            perror("Can't Open Serial Port");
            return(-1);
        }
        else
            printf("open ttyS0 .....\n");
    }
    else if(comport==2)
    {    fd = open( "/dev/ttyS1", O_RDWR|O_NOCTTY|O_NDELAY);

    if (-1 == fd){
        perror("Can't Open Serial Port");
            return(-1);
        }
        else
            printf("open ttyS1 .....\n");
    }
    else if (comport==3)
    {
        fd = open( "/dev/ttyS2", O_RDWR|O_NOCTTY|O_NDELAY);
        if (-1 == fd){
            perror("Can't Open Serial Port");
            return(-1);
        }
        else
            printf("open ttyS2 .....\n");
    }
    if(fcntl(fd, F_SETFL, 0)<0)
        printf("fcntl failed!\n");
    else
        printf("fcntl=%d\n",fcntl(fd, F_SETFL,0));
    if(isatty(STDIN_FILENO)==0)
        printf("standard input is not a terminal device\n");
    else
        printf("isatty success!\n");
    printf("fd-open=%d\n",fd);
    return fd;
}
int main(void)
{
    int fd;
    int nread,i;
    char buff[]="Hello\n";
    if((fd=open_port(fd,1))<0){
        perror("open_port error");
        return;
    }
    if((i=set_opt(fd,115200,8,'N',1))<0){
    perror("set_opt error");
        return;
    }
    printf("fd=%d\n",fd);
//    fd=3;
    nread=read(fd,buff,8);
    printf("nread=%d,%s\n",nread,buff);
    close(fd);
    return;

}