linux下串口测试程序

通过简单的参数配置，执行文件+串口号+波特率

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/time.h>
#include <time.h>
#include <string.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <stdint.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>
#include <string.h>
#include <assert.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/time.h>  

#define msleep(x) usleep(x*1000)

void my_printf(const char* head_l, unsigned char*date_in, int length_l)
{
    int k;
    printf("%s ", head_l);
    for ( k = 0; k < length_l; k++)
    {
        printf("%02x ", date_in[k]);
    }
    printf("\n");
} 

int select_serial_device(int dev_id, char *name)
{
    switch (dev_id)
        {
        case 1:
            strcpy(name, "/dev/ttyS1");
            break;

        case 2:
            strcpy(name, "/dev/ttyS2");
            break;

        case 3:
            strcpy(name, "/dev/ttyS3");
            break;

        case 4:
            strcpy(name, "/dev/ttyS4");
            break;

        case 5:
            strcpy(name, "/dev/ttyS5");
            break;

        case 6:
            strcpy(name, "/dev/ttyS6");
            break;

        case 7:
            strcpy(name, "/dev/ttyS7");
            break;

        case 8:
            strcpy(name, "/dev/ttyS8");
            break;

        case 9:
            strcpy(name, "/dev/ttyS9");
            break;
        case 10:
            strcpy(name, "/dev/ttyS10");
            break;

        case 11:
            strcpy(name, "/dev/ttyS11");
            break;

        default:
            return -1;
        }
        return 0;
}
unsigned int choose_baud_rate(int br_id)
{
        unsigned int baud;
        switch (br_id)
        {
            case 0:
                baud = B0;
                break;
            case 50:
                baud = B50;
                break;
            case 75:
                baud = B75;
                break;
            case 110:
                baud = B110;
                break;
            case 134:
                baud = B134;
                break;
            case 150:
                baud = B150;
                break;
            case 200:
                baud = B200;
                break;
            case 300:
                baud = B300;
                break;
            case 600:
                baud = B600;
                break;
            case 1200:
                baud = B1200;
                break;
            case 1800:
                baud = B1800;
                break;
            case 2400:
                baud = B2400;
                break;
            case 9600:
                baud = B9600;
                break;
            case 19200:
                baud = B19200;
                break;
            case 38400:
                baud = B38400;
                break;
            case 57600:
                baud = B57600;
                break;
            case 115200:
                baud = B115200;
                break;
            case 460800:
                baud = B460800;
                break;
            case 921600:
                baud = B921600;
                break;
            case 1000000:
                baud = B1000000;
                break;
            default:
                printf("input error: baud rate not correct");
                return -1;
        }
        return baud;
}
int init_serial_device(char *name, int baud)
{
    int fd;
    int ret;
    struct termios options;

    fd = open(name, O_RDWR | O_NDELAY | O_NOCTTY);

    if (fd == -1){
        printf("%s: open error\n", name);
        return -1;
    }
    ret = tcgetattr(fd, &options);
    if (-1 == ret)
        return -1;

    options.c_cflag &= ~CSIZE;    //屏蔽其他标志
    options.c_cflag |= CS8;        //将数据位修改为8bit
    options.c_cflag &= ~PARENB; //无校验
    options.c_cflag &= ~CSTOPB; // 设置一位停止位;        

    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
    cfsetispeed(&options, baud);
    cfsetospeed(&options, baud);
    options.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
    ret = tcsetattr(fd, TCSANOW, &options);
    if (-1 == ret)
        return -1;
    return fd;
}

void process_serial_data(int fd)
{
    char sendbuf[64] = "123456789123456789123456789123456789";
    char recvbuf[64] = "";
    int ret;

    while (1){
        ret = write(fd, sendbuf,36); //发送数组
        my_printf("send:",sendbuf,ret);
        msleep(100);

        while(1){
            memset(recvbuf, 0, sizeof(recvbuf));
            ret = read(fd, recvbuf, 255);
            if (ret == 0)
                continue;
            if(ret>0){
                my_printf("recv:",recvbuf,ret);
                break;
            }
        }
        msleep(200);
    }
}

int main(int argc, char **argv)
{
    int fd;
    int bn;
    int ret;
    char name[12];
    char sn;
    speed_t baud;

    if (argc < 2){
        printf("input error:*argv=1-11\n");
        exit(-1);
    }
    if (argc > 3){
        printf("input error: less than 4 parameters\n");
        exit(-1);
    }

    ret = sscanf(argv[1], "%d", &sn);

    ret = select_serial_device(sn,name);
    if (-1 == ret)
        return -1;

    ret = sscanf(argv[2], "%d", &bn);

    baud = choose_baud_rate(bn);
    if (-1 == ret)
        return -1;

    fd = init_serial_device(name,baud);
    if (-1 == fd)
        return -1;

    process_serial_data(fd);

    return 0;
}

直接交叉编译即可