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- Linux Serial Port Programming Example Pdf
- Linux Serial Port Communication
- Linux Serial Port Programming How To
- Linux Serial Port Programming C Example
Serial Programming HOWTO. This document describes how to program communications with devices over a serial port on a Linux box. Input Concepts for Serial. I am a little bit confused about reading and writing to a serial port. I have a USB device in Linux that uses the FTDI USB serial device converter driver. When I plug it in, it creates: /dev/ttyUSB1. I thought itd be simple to open and read/write from it in C. I know the baud rate and parity information, but it seems like there is no standard.
- I am new to C and linux I wrote a C serial port program in linux to read the.txt file from ttyusb and to save this to a another.txt file. My program doesn't work as i expected There is a text file named 'sample.txt' which contains the following text sample.txt hi welcome to oviya technologies bangalore.
- Programming the Serial Port. In this tutorial i am going to use C language to program the Serial port,compiler used is GCC. If you are interested to know more about the internals of the serial port you can refer “The Serial Programming Guide for POSIX Operating Systems” written by Michael R.Sweet.
Linux Serial Port Programming Example Pdf
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Linux Serial Port Communication
xanthium-enterprisesSerial Programming on Linux V1.07865c54Sep 4, 2015
1 contributor
Linux Serial Port Programming How To
/**/ |
/* Serial Port Programming in C (Serial Port Read) */ |
/* Non Cannonical mode */ |
/*----------------------------------------------------------------------------------------------------*/ |
/* Program reads a string from the serial port at 9600 bps 8N1 format */ |
/* Baudrate - 9600 */ |
/* Stop bits -1 */ |
/* No Parity */ |
/*----------------------------------------------------------------------------------------------------*/ |
/* Compiler/IDE : gcc 4.6.3 */ |
/* Library : */ |
/* Commands : gcc -o serialport_read serialport_read.c */ |
/* OS : Linux(x86) (Linux Mint 13 Maya)(Linux Kernel 3.x.x) */ |
/* Programmer : Rahul.S */ |
/* Date : 21-December-2014 */ |
/**/ |
/**/ |
/* www.xanthium.in */ |
/* Copyright (C) 2014 Rahul.S */ |
/**/ |
/**/ |
/* Running the executable */ |
/* ---------------------------------------------------------------------------------------------------*/ |
/* 1) Compile the serialport_read.c file using gcc on the terminal (without quotes) */ |
/**/ |
/* ' gcc -o serialport_read serialport_read.c ' */ |
/**/ |
/* 2) Linux will not allow you to access the serial port from user space,you have to be root.So use */ |
/* 'sudo' command to execute the compiled binary as super user. */ |
/**/ |
/* 'sudo ./serialport_read' */ |
/**/ |
/**/ |
/**/ |
/* Sellecting the Serial port Number on Linux */ |
/* ---------------------------------------------------------------------------------------------------*/ |
/* /dev/ttyUSBx - when using USB to Serial Converter, where x can be 0,1,2..etc */ |
/* /dev/ttySx - for PC hardware based Serial ports, where x can be 0,1,2..etc */ |
/**/ |
/*-------------------------------------------------------------*/ |
/* termios structure - /usr/include/asm-generic/termbits.h */ |
/* use 'man termios' to get more info about termios structure */ |
/*-------------------------------------------------------------*/ |
#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 */ |
voidmain(void) |
{ |
int fd;/*File Descriptor*/ |
printf('n +----------------------------------+'); |
printf('n | Serial Port Read |'); |
printf('n +----------------------------------+'); |
/*------------------------------- Opening the Serial Port -------------------------------*/ |
/* Change /dev/ttyUSB0 to the one corresponding to your system */ |
fd = open('/dev/ttyUSB0',O_RDWR | O_NOCTTY); /* ttyUSB0 is the FT232 based USB2SERIAL Converter */ |
/* O_RDWR - Read/Write access to serial port */ |
/* O_NOCTTY - No terminal will control the process */ |
/* Open in blocking mode,read will wait */ |
if(fd -1) /* Error Checking */ |
printf('n Error! in Opening ttyUSB0 '); |
else |
printf('n ttyUSB0 Opened Successfully '); |
/*---------- Setting the Attributes of the serial port using termios structure --------- */ |
struct termios SerialPortSettings; /* Create the structure */ |
tcgetattr(fd, &SerialPortSettings); /* Get the current attributes of the Serial port */ |
/* Setting the Baud rate */ |
cfsetispeed(&SerialPortSettings,B9600); /* Set Read Speed as 9600 */ |
cfsetospeed(&SerialPortSettings,B9600); /* Set Write Speed as 9600 */ |
/* 8N1 Mode */ |
SerialPortSettings.c_cflag &= ~PARENB; /* Disables the Parity Enable bit(PARENB),So No Parity */ |
SerialPortSettings.c_cflag &= ~CSTOPB; /* CSTOPB = 2 Stop bits,here it is cleared so 1 Stop bit */ |
SerialPortSettings.c_cflag &= ~CSIZE; /* Clears the mask for setting the data size */ |
SerialPortSettings.c_cflag |= CS8; /* 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 */ |
char read_buffer[32]; /* 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,32); /* Read the data */ |
printf('nn Bytes Rxed -%d', bytes_read); /* Print the number of bytes read */ |
printf('nn'); |
for(i=0;i<bytes_read;i++) /*printing only the received characters*/ |
printf('%c',read_buffer[i]); |
printf('n +----------------------------------+nnn'); |
close(fd); /* Close the serial port */ |
} |
Linux Serial Port Programming C Example
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