使用arduino发送到串口时ubuntu崩溃

Question

我正在使用 OpenCv 和 tesseract 编写用于字母识别的 c++ 代码，然后我想向串行端口(Arduino)发送命令，但计算机出现故障，我必须重新启动它。

我在代码中做了一些图像处理:转换为灰色
然后模糊图像
然后是阈值和裁剪

最后，我将图像传递给 Tesseract API 以获取字母并将字母保存在文本文件中。

我打开保存的文件并打印文件的内容。
然后我打开与arduino连接的串口并向串口发送一封信。

当我编译代码时，图像处理部分完成，打开文件并打印文件内容，并将其发送到串行端口，但随后代码崩溃并且计算机出现故障。

这是代码:

int fd;
char *buff;



int open_port(void)
{

 fd = open("/dev/ttyACM0", O_RDWR | O_NOCTTY | O_NDELAY);
 if (fd == -1)
 {
  perror("open_port: Unable to open /dev/kittens ");
 }
  else
   fcntl(fd, F_SETFL, 0);

 return (fd);
}

int main( int argc, char** argv )
{
open_port();
int const max_BINARY_value = 255;
 char path[255];



//capture image
  //gray 
  //Gaussian blur image
      //threshold
//crop 



system("tesseract crop.jpg txt -psm 10");//pass it to tesseract API and get the result in file
    ifstream inFile;

  inFile.open ("txt.txt", ofstream::in );//open file contains the letter


char singleCharacter;


    inFile.get(singleCharacter);


    while (!inFile.eof())
    {
         cout << singleCharacter;
         inFile.get(singleCharacter);
    }



int wr,rd;


char msg[]="W";


do 
{

wr = write(fd, msg, 1);
printf("debugging - Wrote to port\n");   
usleep(10000);

if (wr < 0) {
    fputs("write() to port /dev/ttyACM0 failed!\n", stderr);
    break;
            }
 } 
while (buff != msg);

if (buff==msg)
printf(buff, "String Found! Now do the work.");

close(fd);

waitKey(0);

 return 0;
} 

Answer 1

这是一个尝试引导您朝着正确方向前进的镜头。评论在行。

资料来源:
http://en.wikibooks.org/wiki/Serial_Programming/Serial_Linux#Serial_I.2FO_via_Terminal_I.2FO
Linux C Serial Port Reading/Writing

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

int fd;
char *buff;
struct termios tty, tty_old;

int open_port(void)
{
    fd = open("/dev/ttyACM0", O_RDWR | O_NOCTTY);
    if (fd == -1)
    {
        perror("open_port: Unable to open /dev/kittens ");
    }
    else
    fcntl(fd, F_SETFL, 0);

    return 0;
}

int setup_port(void)
{
    memset (&tty, 0, sizeof tty);
    if ( tcgetattr ( fd, &tty ) != 0 )
    {
        perror("setup_port: Unable to GET attributes of /dev/kittens ");
    }
    /* Save old tty parameters */
    tty_old = tty;

    /* Set Baud Rate */
    cfsetospeed (&tty, (speed_t)B115200);
    cfsetispeed (&tty, (speed_t)B115200);

    /* Set other params */
    tty.c_cflag     &=  ~PARENB;        // Make 8n1
    tty.c_cflag     &=  ~CSTOPB;
    tty.c_cflag     &=  ~CSIZE;
    tty.c_cflag     |=  CS8;
    tty.c_cflag     &=  ~CRTSCTS;       // no flow control
    tty.c_cc[VMIN]      =   1;                  // read doesn't block
    tty.c_cc[VTIME]     =   5;                  // 0.5 seconds read timeout
    tty.c_cflag     |=  CREAD | CLOCAL;     // turn on READ & ignore ctrl lines

    /* Make raw */
    cfmakeraw(&tty);

    /* Flush Port, then applies attributes */
    tcflush( fd, TCIFLUSH );
    if ( tcsetattr ( fd, TCSANOW, &tty ) != 0)
    {
        perror("setup_port: Unable to SET attributes of /dev/kittens ");
    }
    return 0;
}

int close_port(void)
{
    close(fd);
    if ( tcsetattr ( fd, TCSANOW, &old_tty ) != 0)
    {
        perror("close_port: Failed to close /dev/kittens ");
    }
    return 0;
}

int main( int argc, char** argv )
{
    int const max_BINARY_value = 255; // what is this here for?
    char path[255]; //what is this here for?
    /* for printing to screen */
    char singleCharacter;
    ifstream inFile;
    /* for reading/writing serial port */
    int wr,rd;
    char msg[]="W";

    /* open & setup serial port */
    open_port();
    setup_port();

    /* other stuff */
    //capture image
    //gray 
    //Gaussian blur image
    //threshold
    //crop 
    system("tesseract crop.jpg txt -psm 10");
    //pass it to tesseract API and get the result in file

    /* writing to screen */
    inFile.open ("txt.txt", ofstream::in );//open file contains the letter
    inFile.get(singleCharacter);
    while (!inFile.eof())
    {
        cout << singleCharacter;
        inFile.get(singleCharacter);
    }

    //do // see below
    //{
    wr = write(fd, &msg, sizeof(msg));
    printf("debugging - Wrote to port\n");   
    //usleep(10000);
    if (wr < 0) {
        fputs("write() to port /dev/ttyACM0 failed!\n", stderr);
        break;
    }
    //while(buff != msg); // what is buff doing?

    /* just don't know why this is here */
    //if (buff==msg)
    //printf(buff, "String Found! Now do the work.");

    close_port();

    waitKey(0);

    return 0;
}