main.cpp.bak

#include <stdio.h>
#include <fcntl.h>  /* File Control Definitions		  */
#include <termios.h>/* POSIX Terminal Control Definitions*/
#include <unistd.h> /* UNIX Standard Definitions		 */
#include <errno.h>  /* ERROR Number Definitions		  */
#include <iostream>
#include <cstring>


int main(int argc, char** args )
{
	int fd;
	fd = open("/dev/ttyUSB0",O_RDWR | O_NOCTTY);
	if( fd == 1)
		printf("\n  Error! in Opening ttyUSB0\n");
	else
		printf("\n  ttyUSB0 Opened Successfully\n");

	struct termios SerialPortSettings;
	
	tcgetattr(fd, &SerialPortSettings);

	cfsetospeed(&SerialPortSettings,B9600);
	SerialPortSettings.c_cflag |=  PARENB; /*SET   Parity Bit PARENB*/
	SerialPortSettings.c_cflag &= ~CSTOPB; //Stop bits = 1 



	SerialPortSettings.c_cflag &= ~CSIZE; /* Clears the Mask	   */
	SerialPortSettings.c_cflag |=  CS7;   /* Set the data bits = 8 */


	SerialPortSettings.c_cflag &= ~CRTSCTS;	   /* No Hardware flow Control						 */
	SerialPortSettings.c_cflag |= CREAD | CLOCAL; /* Enable receiver,Ignore Modem Control lines	   */ 
	
	
	SerialPortSettings.c_iflag &= ~(IXON | IXOFF | IXANY);		  /* Disable XON/XOFF flow control both i/p and o/p */
	SerialPortSettings.c_iflag &= ~(ICANON | ECHO | ECHOE | ISIG);  /* Non Cannonical mode							*/

	SerialPortSettings.c_oflag &= ~OPOST;/*No Output Processing*/
	
	/* Setting Time outs */
	SerialPortSettings.c_cc[VMIN] = 10; /* Read at least 10 characters */
	SerialPortSettings.c_cc[VTIME] = 0; /* Wait indefinetly   */


	if((tcsetattr(fd,TCSANOW,&SerialPortSettings)) != 0) /* Set the attributes to the termios structure*/
		printf("\n  ERROR ! in Setting attributes");
	else
				printf("\n  BaudRate = 9600 \n  StopBits = 1 \n  Parity   = none");
		
		/*------------------------------- Read data from serial port -----------------------------*/

	tcflush(fd, TCIFLUSH);   /* Discards old data in the rx buffer			*/
	int bytes_to_read = 2000;
	char read_buffer[bytes_to_read];   /* Buffer to store the data received			  */
	int  bytes_read = 0;	/* Number of bytes read by the read() system call */
	int i = 0;

	bytes_read = read(fd,&read_buffer,bytes_to_read); /* Read the data				   */
		
	printf("\n\n  Bytes Rxed -%d", bytes_read); /* Print the number of bytes read */
	printf("\n\n  ");

	for(i=0;i<bytes_read;i++)	 /*printing only the received characters*/
		printf("%c",read_buffer[i]);

	printf("\n +----------------------------------+\n\n\n");
	printf("Initiating Loop...");
	while("false")
	{
		/*
		std::memset(read_buffer,0,bytes_to_read);
		bytes_read = 0;
		bytes_read = read(fd,&read_buffer,bytes_to_read); // Read the data   
		for(i=0;i<bytes_read;i++)
			printf("%c",read_buffer[i]);
			*/




		char buffer[100];
		ssize_t length = read(fd, &buffer, sizeof(buffer));
		if (length == -1)
		{
			printf("Error reading from serial port\n");
			break;
		}
		else if (length == 0)
		{
			printf("No more data\n");
			break;
		}
		else
		{
			buffer[length] = '\0';
			printf("%s", buffer);
		}	


	}
	close(fd); /* Close the serial port */
	return 0;
}