c program to read data from beagle board

parupati · December 10, 2009, 2:09am

Hi ,

I have written C program to read and echo data from beagleboard to
PC using serial com port .
I am using same C code for linux PC and beagle board.

When I send data from beagle board to PC, PC receiving data and
sending back to beagle board.But beagleboard unable to receive data
from PC. I tried with different baud rates, PC is receiving data
with all baud rates, but beagle board not receiving data.

Can any one please suggest me, If anything is wrong with me.

Thank you,
Srikanth parupati

Nishanth_Menon · December 10, 2009, 2:19am

Hi ,

I have written C program to read and echo data from beagleboard to
PC using serial com port .
I am using same C code for linux PC and beagle board.

When I send data from beagle board to PC, PC receiving data and
sending back to beagle board.But beagleboard unable to receive data
from PC. I tried with different baud rates, PC is receiving data
with all baud rates, but beagle board not receiving data.

Can any one please suggest me, If anything is wrong with me.

you may want to look at

github.com

nmenon/omap-u-boot-utils/blob/master/lib/serial_posix.c

/**
 * @file
 * @brief Serial port operations wrapper for Linux/posix compliant OSs
 *
 * FileName: lib/serial_linux.c
 *
 * This implements the APIs in include/serial.h for linux and posix
 * compliant OSes. The code here is heavily indebted to:
 * @li http://tldp.org/HOWTO/Serial-Programming-HOWTO/x115.html#AEN129
 * @li http://www.comptechdoc.org/os/linux/programming/c/linux_pgcserial.html
 *
 */
/*
 * (C) Copyright 2008
 * Texas Instruments, <www.ti.com>
 * Nishanth Menon <nm@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation version 2.

This file has been truncated. show original

and omap-u-boot-utils/lib/serial_win32.c at master · nmenon/omap-u-boot-utils · GitHub
based on your host OS version.

usually uart3 is set at 115200n8 baudrate and unless you tell the port
to be at a different baud config it probably wont work..

if you have details on your test code etc.. do post on linux-omap
mailing list (Majordomo Lists at VGER.KERNEL.ORG)…

abraham · December 10, 2009, 7:21am

Hello,

I had the same problem you are having but I found a way to do it.

There is a library called “LibSerial” which is very very simple to use. The only drawback is the installation process. I already have a recipe ready for this. I will save you some time by sending you the .ipk packets to install.

Here is an example (compiled with <g++ helloplus.cpp -Iinclude -lserial -o helloplus>) You can try this example with Ubuntu first to test LibSerial.

if you are interested in trying LibSerial and if this is what you were asking for, just reply and I will send you the .ipk packages you need to install in your BeagleBoard.

/*

LibSerial example with C++

Vladimir_Pantelic1 · December 10, 2009, 9:27am

parupati wrote:

Hi ,

I have written C program to read and echo data from beagleboard to
PC using serial com port .
I am using same C code for linux PC and beagle board.

When I send data from beagle board to PC, PC receiving data and
sending back to beagle board.But beagleboard unable to receive data
from PC. I tried with different baud rates, PC is receiving data
with all baud rates, but beagle board not receiving data.

Can any one please suggest me, If anything is wrong with me.

I cannot comment if anything is wrong with you :-), but I suggest you
check your serial cable setup. what you describe is a symptom of a
wrong serial cable (IDC10 to DB9 most likely)

parupati · December 11, 2009, 12:12am

Hi Vladimir,

I think there is no prob with the cable because, at booting time of
beagle board I can able to boot up messages and login to beagle sytem
through serial communication.

Please suggest me

Thank you,
Srikanth

Marc1 · December 11, 2009, 8:14am

Hello, you might want to use a usb-serial converter instead of the built-in serial port, specially if you are using it for console access allready.
Anyhow we are using a pl2303 usb-serial adapter and works fine most of the time

It might be a problem with the kernel version (2.6.29), I still don’t know but once in a while (unpredictable) the serial port stops sending data. Has anyone had this problem with pl2303 adapters?

parupati · December 11, 2009, 8:15pm

Hi Marc,

Could you please send me the link for drivers (pl2303 usb-serial adapter) .

Thank you,
Srikanth

Marc1 · December 12, 2009, 2:28pm

Hello, the driver I use is from the kernel source itself (linux-omap-2.6.29-r48), you can find it under drivers/usb/serial/pl2303.c

Floof · October 2, 2012, 3:57pm

Hello, I am trying to use LibSerial in my BeagleBone, and have the following error:

Building file: …/src/SerialComm.cpp
Invoking: GCC C++ Compiler
arm-linux-gnueabi-g++ -I/usr/include/c++/4.6.3 -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/SerialComm.d" -MT"src/SerialComm.d" -o “src/SerialComm.o” “…/src/SerialComm.cpp”
/bin/sh: 1: arm-linux-gnueabi-g++: not found
make: *** [src/SerialComm.o] Error 127

Does this have to do with where I installed LibSerial? If so, what is the best way to install it, somewhere in the Arm-Linux-GNUeabi folder? I installed LibSerial using Ubuntu’s Software Center.