6_11_天天向上_TTYUSB0_embedded&&zigbee

本文链接：https://blog.youkuaiyun.com/doublewei1/article/details/7683466

本文介绍了一个简单的串口通信程序实现，包括串口打开、初始化、写入及读取数据等功能。程序使用C语言编写，通过Linux系统提供的API完成串口设备的配置与交互。

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#include<stdio.h>
#include<string.h>
#include<unistd.h>
#include<fcntl.h>
#include<errno.h>
#include<termios.h>

int open_port(void)
{
        int fd;
        fd=open("/dev/ttyS1",O_RDWR|O_NOCTTY|O_NDELAY);
        if(fd==-1)
        {
                printf(" unable to open /dev/ttyS1\n");

        }
        else
        {
                printf("\nOpen serial Ok~\n");
                      fcntl(fd,F_SETFL,0);

}

return(fd);
}

void init_serial(int fd)
{
        struct termios options;
        tcgetattr(fd,&options);
        cfsetispeed(&options,B115200);
        cfsetospeed(&options,B115200);
        options.c_cflag|=(CLOCAL|CREAD);
        options.c_cflag&=~CSIZE;
        options.c_cflag|=CS8;
        tcsetattr(fd,TCSANOW,&options);

}

int read_data(int fd)
{
        char buffer[255];
        char *bufptr;
        int nbytes;
        bufptr=buffer;

while((nbytes=read(fd,bufptr,buffer+sizeof(buffer)-bufptr-1))>0)
{

        bufptr+=nbytes;
        if(bufptr[-1]=='\n'|| bufptr[-1]=='\r')
                 break;

}

*bufptr='\0';
printf("\n%s\n",buffer);

return(0);
}

int write_port(int fd)
{
        int n;
        printf("in F_write_port\n");
        n=write(fd,"hello world!\r",12);
        if(n<0)
        {
                fputs("failed!\n",stderr);
        }
        else
        {
                printf("write ok\n");
        }
        return 0;
}

int main(void)
{
        int fd;
        fd=open_port();
        if(fd!=-1)
        {
           init_serial(fd);
               write_port(fd);

//read_data(fd);

}

close(fd);
return 0;
}

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