ubuntu下串口发送或者接收（c语言实现）minicom调试_ubuntu c语言接受端口流量

关于串口的知识这里就不累赘了，看着多又烦，搞这个的都懂串口，不多废话了！！

进入正题！！

1.选择合适的usb串口模块

某宝很多这种模块，有各种型号的(例如ch340)，这里要说说了 选哪种合适

打开ubutnu的命令行

$lsmod | grep usbserial

usbserial              45056  2 cp210x,ch341

查看自己电脑有那些驱动比如我电脑就可以买上面型号的模块ch340的也可以

$ dmesg

输出相关信息，部分信息如下：
  [  429.184170] usb 6-1: new full-speed USB device number 3 using uhci_hcd
[  429.345937] usb 6-1: New USB device found, idVendor=1a86, idProduct=7523
[  429.345944] usb 6-1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[  429.345948] usb 6-1: Product: USB2.0-Ser!
[  429.368123] usbcore: registered new interface driver usbserial
[  429.368396] usbcore: registered new interface driver usbserial_generic
[  429.368875] usbserial: USB Serial support registered for generic
[  429.374125] usbcore: registered new interface driver ch341
[  429.374143] usbserial: USB Serial support registered for ch341-uart
[  429.374165] ch341 6-1:1.0: ch341-uart converter detected
[  429.386851] usb 6-1: ch341-uart converter now attached to ttyUSB0
ID信息与lsusb检测到的一致，ch341-uart converter now attached to ttyUSB0  成功驱动，端口为ttyUSB0！！（很重要，后面的程序中需要，还有minicom也需要设置）

2.下载minicom

$ sudo apt-get install minicom

等待安装成功，然后用sudo minicom -s 设置minicom的端口对应到ttyUSB0（对应使用dmesg命令看到的信息）。
出现配置菜单：

选择“Serial port setup”，出现串口配置菜单：

输入A，修改serial device 由/Dev/tty0修改为/dev/ttyusb0，波特率等修改为115200 8N1。

enter 后 save setup as dfl

Welcome to minicom 2.7
 
OPTIONS: I18n 
Compiled on Feb  7 2016, 13:37:27.
Port /dev/ttyUSB0, 14:06:56
 
Press CTRL-A Z for help on special keys

上面就是命令模式了

输入你想发送的数据就可以了，当然也可以在上面收到串口发来数据！

但是！！！可能你看不到你发送的数据，（ctrl A 后按下E选择回显）这样你就可以看到你发送的数据了！！！

ctrl A 后按下Q是退出minicom，打开minicom就在命令行下输入minicom就可以打开了

3.串口发送程序

 
/
 
//Author: CSDN Maizidian
 
//Serial communication under ubutnu, data sending and receiving
 
/
 
#include <stdio.h>
 
#include <stdlib.h>
 
#include <unistd.h>
 
#include <string.h>
 
#include <errno.h>
 
#include <sys/types.h>
 
#include <sys/stat.h>
 
#include <fcntl.h>
 
#include <termios.h>
 
#define BAUDRATE B115200 ///Baud rate : 115200
 
#define DEVICE "/dev/ttyUSB0"//Set your port number
 
int nFd = 0;
 
struct termios stNew;
 
struct termios stOld;
 
 
 
//Open Port & Set Port
 
int SerialInit()
 
{
 
    nFd = open(DEVICE, O_RDWR|O_NOCTTY|O_NDELAY);
 
    if(-1 == nFd)
 
    {
 
        perror("Open Serial Port Error!\n");
 
        return -1;
 
    }
 
    if( (fcntl(nFd, F_SETFL, 0)) < 0 )
 
    {
 
        perror("Fcntl F_SETFL Error!\n");
 
        return -1;
 
    }
 
    if(tcgetattr(nFd, &stOld) != 0)
 
    {
 
        perror("tcgetattr error!\n");
 
        return -1;
 
    }
 
 
 
    stNew = stOld;
 
    cfmakeraw(&stNew);//Set the terminal to raw mode, in which all input data is processed in bytes
 
 
 
    //set speed
 
    cfsetispeed(&stNew, BAUDRATE);//115200
 
    cfsetospeed(&stNew, BAUDRATE);
 
 
 
    //set databits
 
    stNew.c_cflag |= (CLOCAL|CREAD);
 
    stNew.c_cflag &= ~CSIZE;
 
    stNew.c_cflag |= CS8;
 
 
 
    //set parity
 
stNew.c_cflag &= ~PARENB;
 
stNew.c_iflag &= ~INNPCK;
 
 
 
    //set stopbits
 
stNew.c_cflag &= ~CSTOPB;
 
    stNew.c_cc[VTIME]=0; //Specify the minimum number of characters to be read
 
    stNew.c_cc[VMIN]=1; //Specify the waiting time for reading the first character, the unit of time is n*100ms
 
                //Assuming VTIME=0 is set, the read() operation is blocked indefinitely when no character is input
 
    tcflush(nFd,TCIFLUSH); //Clear the terminal's unfinished input/output requests and data.
 
if( tcsetattr(nFd,TCSANOW,&stNew) != 0 )
 
    {
 
        perror("tcsetattr Error!\n");
 
        return -1;
 
    }
 
 
 
    return nFd;
 
}
 
 
 
int main(int argc, char **argv)
 
{ int i;
 
    int nRet = 0;
 
    char *sendmsg="Wheat";
 
    char buf[5];
 
    if( SerialInit() == -1 )
 
    {
 
        perror("SerialInit Error!\n");
 
        return -1;
 
    }
 
    bzero(buf, SIZE);
 
    while(1)
 
    { sleep(1);
 
        write(nFd,sendmsg,sizeof(sendmsg));//Send data to serial port
 
        printf("%s\n",sendmsg);
 
 
 
        /serial port receiving part
 
        nRet = read(nFd, buf, SIZE);
 
        if(-1 == nRet)
 
        {
 
            perror("Read Data Error!\n");
 
            break;
 
        }
 
        if(0 < nRet)
 
        {
 
            buf[nRet] = 0;
 
            printf("Recv Data: %s\n", buf);
 
        }
 
        /
 
    }
 
    close(nFd);
 
    return 0;
 
}