Programming :: Transferring A Program Across Rs232?
Dec 16, 2009
I've started development on a ARM board. The ARM board displays it's command prompt through it's rs232 output. So I open putty/minicom (rs232 display) and can see and interact with the ARM linux system through my PC. The ARM root fs is on a USB pen, So I cross compile on my PC, then plug the pen into my PC copy the exe into the home/usr etc folder. Then unplug. plug it into the ARM boot the ARM and from my PC rs232 window can run the code. However plugging/unplugging is taking an age, I'm sure there must be a way to transfer the exe across the rs232. I've tried to use putty minicom to do so throught various methods xmodem etc but don't seem to be able to. I think I must have to do something on the ARM end but am unsure what?
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Jan 5, 2011
I am trying to create a RS232 C program that executes a series of commands down the line to a robot. Everything seems to work fine, except any sequential write to the serial port. At first I thought it was the UART's buffer being filled too fast, but even with a 50 uS delay it still throws the error.
Here is my code:
Code:
#include <termios.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/signal.h>
#include <sys/types.h>
[Code]...
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Jun 1, 2010
I have been working on writing a small rs232 driver like minicom for months. I am almost there, I have the interrupt service routine running, I can read() ok. However when I write(), it returns the number of characters written, 1, but nothing is actually written out the port. I researched termios, and they say that serial port programming is really messy in linux/unix.
I am probably not setting up the port parameters correctly, or my write() function is not doing what it is supposed to. As I said, write() is returning successful. Other comm programs run ok (picocom & gtkterm) on my hardware. I am running knoppix/debian on an ancient computer. I saw other guys using slackware.
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Apr 1, 2009
I'm trying to attach an fstream to serial port for reading and writing with the following code:
Code:
#include <iostream>
#include <fstream>
#include <string>
[code]....
The code compiles without errors, but doesn't catch any input text from the device attached to RS232. I have tried it with Rx and Tx connected, but didn't receive my text back. It works OK if I substitute /dev/ttyS0 with an ordinary file, but any attempt to use /dev/ttyS0 seems to lead to an empty answer string. I tried this on a PC under Ubuntu Linux 7.10.
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Nov 29, 2010
I am writing a program to send data over serial port but the sending and reading operation is not occurring as desired to be... Below you can see the read and write parts. Could you please help me to find where I am doing wrong...
Reading Part:
Code:
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
[code]....
When I compile and run the above programs Reading part does not read the 13 bytes once it first reads 8 byte then 8 again then 2 and so on. It always divides the sent data...
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Aug 5, 2010
I want to send something through the serial port, for example
[code]...
the point here is send some numbers to a couple of 7 seg displays, so I will wire a RS232 chip on a protoboard, the logic after the RS232 is not an issue, but how can I assure the data is being sent right from my linux box to the RS232 chip, the one on the protoboard? Do I have to write a C program to read the strings and then send them to the serial port?For example if I wanted to send this to the displays:
[code]...
So I guess the simplest way is (Supposing I can deal with the stream so it is filtered and only display the number array) $ ifstat > /dev/ttyS0 But, how do I know if the RS232 will take them as the right characters?
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Jun 10, 2009
I have been reading data(non-canonical input) off a serial port in a loop. The device I am connected to sends the data in a bursty manner and I have to read using the loop. The device sends some data when initially powered on which I am supposed to read. I can then send "commands" to the device over the serial port. The "command" is supposed to be "debug d 35 5 0"After I send the command there is some data that is sent back by the device to show that the command was successful. This command should elicit the right response from the device but it responds correctly some times while other times it does not. (when I try to write the consecutive commands) If I send two consecutive commands after reading the initial data and the command feedback I face some problems.
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May 3, 2011
The problem with the kind of say I'm a Debian era "learned" to use that gnome-commander program for transferring files. The problem has now become a fact that when the connector for the USB stick machine, so it appears pcmanfm file management, and yes it works fine (ie I use opensuse 11.4 LXDE desktop), but the gnome-commander:in the sticks did not appear at allAnd why say that matter could be caused, and will be able to do something about it?
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Feb 15, 2011
I will have to code this. However I am lacking of time since I have too much to do. make a short code bash/dash to prompt the country with Zenity, then, get the PLS or m3u url and prompt with another zenity which radio to play. http://www.listenlive.eu/index.html
My code to get url's radio country.htm is:
Code:
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May 13, 2010
I am trying to interface a machine (lock in amplifier) with Ubuntu using a RS 232(25pin) to USB cable. I wrote a program in c to interact with the machine. I think the machine is detected (after connecting the machine a file is created in folder /dev with name ttyusb1. I heard that ubuntu has all the header files required to interface with the port. with the help of a person i wrote this program (please see the attachment below.) but i don't know whether the commands are right or wrong. the program is compiled. but when i run the program it is getting stuck. i have to stop the program using Ctrl+z. if anyone knows these commands (how to write to or read from the port) please help me with this program.
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May 18, 2010
been trying to use a rs232 device that uses the usb port. it calls for a virtual com port to be created. i am running on ubuntu 10 and get hella confused with the search results i have come across.some call for the usbdevfs which apparently doesn't exist under lucid. another had me do use some "magic" in getting it to work.they provided a script mountusbfs.sh
Code:
#
# Magic to make /proc/bus/usb work
#
mkdir -p /dev/bus/usb/.usbfs
[code]....
of course when i tried it the domount command doesn't exist so i modified the above script replacing the domount with mount and it seemed to do something things. usbview is specified as the determining factor whether or not you have the usbfs mounted properly. it wants to use proc bus and ubuntu doesn't use that anymore apparenlty. i have read that i need to enable a usbmon (flag?option?) in the kernel to be set. which it isn't when i followed the steps to check.
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Jan 15, 2010
Ok so Basically i have 2 questions
1. i know how to create a file with c++ using but is there a way to save it to a specific location on your computer with windows and linux
Code:
2. i need to know how to run/execute/open a file in a c++ program im using and its not working
Code:
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Feb 9, 2011
a few day ago i have checked my application and make rs232 cable converter to communicated it. And not detected, why? FYI, this is my lsusb command, but in my dmesg, was not found. check this out, (usualy there is another rows, just like ".....converted to ttyUSB0....")
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Aug 6, 2010
I was able to write a script on Linux Shell for send and read data to a serial port. But I�m facing a problem now. If by any mean I send to de device anything else than the predefined strings, stated by the manufacturer, the device ceases to respond. The only way I found its to turn off and then turn on the thing again. Which its very impractical. Its there any way to "reset de UART chip on the device" or send some string based on the RS232 standard that clean the device buffer?
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Apr 27, 2010
how to access serialport(RS232) data using OpenGL.Heard about SDL(Simple DirectMedia Layer),but didn't get how to use SDL and OpenGL to access RS232 data.
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Jun 24, 2011
is possible to configure NTP server to transmit time with COM (RS232) port ????
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Feb 12, 2011
im trying to build a simple program for my C programming class, this is the source code
#include <stdio.h>
int main()
{
int length, width, length, height, area, perimeter;
perimeter = width + length + height;
area = width * length + heigth;
[Code]...
i dont see any error (you might)but every time i run it it runs but after it asks me to input for the width i do it but it doesn't take me to the length, it just stays blank until i input another value in the same place for the width, it asks me for 4 inputs in total i don;t know why, and after i run it different times it gives me different values for the perimeter and are. how can I fix this?
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Feb 5, 2009
I found some interesting behavior when discussing the pow function from Math.h with someone. I am well aware of the need to compile with the -lm flag, but to my surprise this actually isn't necessary if the arguments to the pow function are literals. For example, this program compiles in gcc without using -lm:
Code:
#include <stdio.h>
#include <math.h>
int main()
[code]....
If I try to change the call to any of these:
Code:
double bCubed = pow(2.0, e);
Code:
double bCubed = pow(b, 3.0);
Code:
double bCubed = pow(b, e);
Then the -lm option is required or else it can't compile. So does anyone know why it's necessary to use -lm when the argument(s) is/are variable(s) but it works fine if both arguments are literal values? As a side note, any of the above compile with g++ however. Also, if it helps, this is the version of gcc I'm using:
gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-44)
This doesn't happen on my Mac however that is running: i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5484)
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May 23, 2009
I am new to linux/c programming and I am trying to get TTY id from my c program. Something like this:
int TTYID = get_ttyid();
How do I do that?
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Mar 15, 2011
The following is the error in my program :
Here is my program...
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Mar 10, 2010
With what functions i can write my program in /etc/init.d with c++ to start every time the computer starts ? (like in windows with RegOpenKey,RegSetValueEx..............) ?
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Feb 26, 2010
language:cOs: ubuntuI have googled for a c program to get cpu utilization factor from 2 days.We can get it through "top", "who" commands..But I hav not found any API or a program.
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Aug 17, 2010
Am new to this community and this is my first post. am doing a project where i have to develop a wireless ad hoc routing protocol. I have just begun working on the project. I did not know where to start, so started off with a simple chat program using TCP and thought of making the modifications to it later on. But I do have a prob even i running that!
Am not getting the messages in a synchronized manner. The prog is running fine, but the messages that i type from the server are not reaching the client at all, and at times some garbage values are getting printed(When the strcmp()fn returns 1, "connection terminated" gets printed timely in both the sides. this is the oly situation where i do not get garbage values.) am using VC++ 6.0 here.I have been breaking my head for the past 3-4 days for this simple issue. any response to this would be of great help.
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Nov 22, 2010
I have checked following two pagesand this page also In following program I want to use attribute keyword of C and format string as printf
Code:
#include<stdio.h>
int myfunction (int ,int);
[code]....
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Jun 30, 2010
I want to know how can I make a GUI program from a shell program I coded in C a long time ago. Can anybody point me to good tutorials?
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Jan 29, 2011
I'm new to programming under linux (not new to programming). Before that I have written c++ codes in Visual Studio under windows for some years. I read some tutorials and learned editing codes with vim and compile codes with g++ or make tool. And I tried gdb.
But I think compared to my coding experience in Visual Studio, these steps are very ineffective. With VS, after I wrote codes, I just press ctrl+f7 to compile and ctrl+f5 to run the codes. If I want to debug, press f5, and I can see every variable in a 'watch' window.
Under linux, after I write codes, I need to quit vim, type make to compile. If I have some mistakes, I have to remember the line numbers and re-open vim to check the errors. And I think debugging with gdb is so hard.
I think as a newbie to programming under linux, maybe I haven't find the right tools. Or programming under linux is just so hard so a programmer who can overcame these could be strong enough to do programming without some IDE tools?
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Dec 20, 2010
I want to make alarm(buzzer) and Lamp(led) to work from infrared sensor output via usb.When ir sensor detect motion it will make the alarm&lamp on. Then also sending mail. Im using pic 18f2550-1/sp(usb Fsio from km2.net).But i dont know how to start the program.
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Dec 26, 2010
My Fedora 14 have installed gcc-4.5.1-4.fc14.x86_64,qt-4.7.1-5.fc14.x86_64,
I don't know how to use g++ to compile QT program.
Do I need to set PATH or something else?
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Feb 26, 2010
I want to write a program (in C), which does 4 or 6 simultaneous calculation. Is there away of doing something like:
do at the same time{
Core 1 do:
this_thing_1
[code]....
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Jun 8, 2009
See the first program below :
Code:
This code when compiled gives the following errors:
1. conflicting types for 'fun' at line no: 9
2. previous declaration of 'fun' was here at line no: 3
Why is this happening?
If i modify the above program as shown in the second program below:
Code:
This code when compiled gives no errors.
Why the difference occurs between the first and second program?
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