test.c

来自「一个Linux串口通信小程序.使用时请注意修改MAKEFILE.」· C语言 代码 · 共 53 行

#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 <pthread.h>

int main(void)
{
    int fd;
    char rxBuffer[1024];
    int len = 1024;
    int rxByte;
    struct termios opt;

    fd = open("/dev/ttyS1",O_RDWR);
    if(fd==-1)
    {
        perror("error");
    }
    //set bps
    tcgetattr(fd,&opt);
    cfsetispeed(&opt,B9600);
    cfsetospeed(&opt,B9600);
    //set raw input and output
    opt.c_lflag &= ~(ICANON|ECHO|ECHOE|ISIG);
    opt.c_oflag &= ~OPOST;
    tcsetattr(fd,TCSANOW,&opt);
    //print tips
    printf("Please enter any data to the COM1, Enter key to confirm\n");
    write(fd,"READY!\n",7);
    //receive bytes and send back
    while(1)
    {
        rxByte = 0;
        rxByte = read(fd,rxBuffer,len);
        if(rxByte>0)
        {
      	    rxBuffer[rxByte]='\0';
            write(fd,"RE:",3);
            write(fd,rxBuffer,rxByte);
            write(fd,"\n",1);
      	    printf("%s\n",rxBuffer);
        }
    }
    close(fd);
    return 0;
}