Serial communication in linux

[bakhat]

Hellow Dears

i want to do serial communication using linux. i dont have any idea of programming in linux. can any one help me in doing the very basic serial communication on linux platform.

 

[techie]

There are a few documets at tldp.org specifically on this subject.

 

[nooknikz]

Link : https://www.tldp.org/HOWTO/Serial-Programming-HOWTO/index.html

example source code : https://www.ontrak.net/linux.htm

 

[bakhat]

Hello,

I tried to access the serial port "com2" of ep9312. i used device file ttyAM1 but when i run programm the program access com1 of ep9312, i change the device file to ttyAM0 to use the other com port but the programm still uses the same come port. there are only 2 files in ramdisk "ttyAM0 and ttyAM1" both files using com1 How can i access the com2, is there any special device files fo it or i am doing any mistake i am using the programm

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
int open_port();
int main()
{ struct termios options;
int i;
int n;
int fd;
int open_port(void)
{
fd=open("/dev/ttyAM1", O_RDWR | O_NOCTTY | O_NDELAY);
if (fd==-1)
{
perror("open_port: unable to open /dev/ttyAM1 - ");
}
else
fcntl(fd, F_SETFL, 0);
return (fd);
}
tcgetattr(fd, &options);
cfsetispeed(&options,B19200);
cfsetospeed(&options,B19200);
options.c_cflag |= ( CLOCAL | CREAD);
tcsetattr(fd, TCSANOW, &options);
for (i=0; i<=10; i++)
{
n= write(fd, "----- O AKBER\n", 14);
write(fd, "Hello World\n", 12);
if (n<0)
fputs("write() of 4 bytes failed!\n", stderr);
}
return 0;
}

I complaid this code with ARM cross compiler provided by cirrus logic cross compiler 2.95.3
i am stucked here,
can any one tell what is the problem?

 

[rave]

hello
see linux application development book

 

[quacklamack]

If you are fluent with Python, you whould definitely try Pyserial.. It makes easy for you to learn the basics of serial and then you can apply the same concepts in C.</p>



Just browse this program, from the page. How could it be simpler?</p>

<tt>
Open port 0 at "9600,8,N,1", no timeout

>>> import serial
>>> ser = serial.Serial(0) #open first serial port
>>> print ser.portstr #check which port was realy used
>>> ser.write("hello") #write a string
>>> ser.close() #close port
</tt>



Quack</p>