Hardware :: Unable To Get Shell When Booting Through Serial Port
Feb 22, 2011
I am working on a embedded target board which runs on linux. The target board is connected to a linux machine through serial port. To bootup the target board, I run the minicom in the linux machine, boot the kernal of the target board through giving the boot command through the serial console (minicom). Now the question is when the target board boots up, it doesn't starts a shell. The rc scripts are getting executed. There are target specific applications getting started from the rc scripts. I appended & to the last launched application. Still I don't get shell prompt.
View 2 Replies
ADVERTISEMENT
Feb 23, 2011
I am working on a embedded target board which runs on linux. The target board is connected to a linux machine through serial port. To bootup the target board, I run the minicom in the linux machine, boot the kernal of the target board through giving the boot command through the serial console (minicom). Now the question is when the target board boots up, it doesn't starts a shell. The rc scripts are getting executed. There are target specific applications getting started from the rc scripts. I appended & to the last launched application. Still I don't get shell prompt.
View 2 Replies
View Related
Jun 11, 2011
I have a linux system connected to an external sensor device that spits out strings of serial data every few seconds. I need to send the data to a remote URL for logging and graphing purposes.
The data coming down the serial is essentially in the format:
And I need to call a URL from my linus box in the format
wget -s [url]
I can read the data to the shell using cat </dev/ttyS0 but I'm now stuck as to how I might then format that data and pass it to a shell script which would presumably run in an endless loop and contain the wget.
View 6 Replies
View Related
May 23, 2010
I am using a F232 USB to serial adapter for connecting my wireless modem to my laptop and I wrote a simple C code for reading data received by the modem transmitted by another modem installed on my target device.The problem is my code is simply giving 0.00000 (float data) output .When I use the same code with my desktop its running fine and I am getting relevant data.What may be the problem? I even changed the permission for my /dev/ttyUSB0 I am using Ubuntu 10.04 on both my laptop and desktop
below is my code
Code:
#include <stdlib.h>
#include <math.h>
#include <errno.h> /* Error number definitions */
#include <termios.h> /* POSIX terminal control definitions */
[code]....
View 5 Replies
View Related
Oct 5, 2010
I have a Linux based board which has one serial port (so, stdin == stdout == stderr == /dev/ttyS0). I want to send Firmware over a serial port using Y-Modem protocol. But, when I poll on given fd (after sending ASCII 'C') its got time out. I am using HyperTerminal which is connected to my board's serial port. So, neither the HyperTerminal (only when it has launched dialogue box to send firmware to the board using Y-Modem) able to read data send by the board nor board able to read data send by the HyperTerminal. But when I type on HyperTeminal then the board got the key-strokes (thats why I can atleast browse through the GUI).
The same serial port is being used to render (VT100 based) GUI. I have managed to disable printk(s) after user-mode is up & running.
View 3 Replies
View Related
Jan 13, 2010
I am trying to get two way serial communications going between a Windows XP system and a Linux system (RHEL 5).I have /sbin/agetty -L 9600 ttyS0
in /etc/inittab. I am using a generic USB to serial adaptor on Windows (Unitek) and a null modem cable. I have putty configured for 9600 baud, 8 bits, no parity, one stop bit, no flow control.I get the login prompt from agetty in the putty window but input does not work; I see weird characters in the putty screen. I can echo output into the device from windows and see it, but
cat < /dev/ttyS0. just prints out weird characters from what I type.
View 3 Replies
View Related
Mar 23, 2010
We have a new machine with RedHat enterprise 5 on it. I need to connect a serial cable to the serial port and talk to another system (old alpha system) instead of using a VT connected to the alpha.Does RedHat come with anything like Keaterm/hyperterm/etc etc?
View 3 Replies
View Related
May 10, 2010
I'm trying to set rxtxSerial to work so a Java app has access to a serial port (via SiLabs CP210x driver, port /dev/ttyUSB0). When I use update-alternatives --config java, there are 3 alternatives which provide `java'. I have tried openJDK and Sun. Both fail but with completely different messages.
[Code].....
View 9 Replies
View Related
Jul 16, 2010
Recently my Ubuntu 10.04 was booting slow and to figure out what was going wrong, I booted Ubuntu in text mode. There I found it was hanging on for 5-6 sec showing "unable to enumerate usb device to Port 1". I know it has something to do with Port1 / usb device, but could not understand and solve it.
View 3 Replies
View Related
Feb 5, 2010
I am writing some application in C, which will access a serial port device (RS232). My application is working good. But if any other application is already opened the port, I couldn't able to identify that. In windows VB program, while accessing comport through mscomm control, i am receiving an error as "Port Already Opened". But in Linux environment, through C program how can i get that? I am accessing comport 1 as follows
fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_SYNC);
View 3 Replies
View Related
Mar 25, 2010
Can anyone one give me some pointers please, for talking to a serial port, if I use cutecom it always returns "could not open /dev /tty0 or 1 or 3 or 4, even tried ttys0 etc
View 7 Replies
View Related
Jan 19, 2011
i would like to connect to my cisco via a console port and i dont konw how
View 13 Replies
View Related
Apr 14, 2010
I have a laptop which has only one serial port.
I went into:
How do I know which of those "ttyS" refers to my serial port?
View 2 Replies
View Related
Apr 27, 2011
ive been looking through several online documents and forum posts but i cant get a clearcut answer on how to set up serial port acces in ubuntu 10.04 (server).
View 7 Replies
View Related
Aug 12, 2010
I have two usb2serial adapters connected to my PC with a null modem (I am doing some testing to learn serial comm for a particular application). I am writing to /dev/ttyUSB0 a trying to read /dev/ttyUSB1. I have used screen (screen /dev/ttyUSB1 115200) and am able to see the characters being written. I am also able to read and write with Python with the following code
Code: import serial,time,sys
ser1 = serial.Serial('/dev/ttyUSB0',baudrate=115200)
ser2 = serial.Serial('/dev/ttyUSB1',timeout=2,baudrate=115200)
ser1.open()
ser2.open()
[Code]....
View 3 Replies
View Related
Feb 6, 2010
How do I get syslog using serial port?
View 2 Replies
View Related
Jul 11, 2011
I can't communicate with and UPS (Eaton) via a serial port. The serial port is UP and have been tested under a Windows OS.I have set up the communication parameters and tried to establish a dialog with the UPS. Minicom is installed. Nothing appears ont the screen and the VT102 has an offline status. The OS is Red Hat Enterprise Linux 5 64bits.Is somebody have examples to debug the serial port ?
View 7 Replies
View Related
Jan 25, 2011
I need cause an interrupt on a serial port. If I put a single HIGH on the RX pin, will that cause one? I all ready use the 4 control lines for data.Hope I am making sense?
View 5 Replies
View Related
Apr 14, 2009
I need a to add a usb serial port adapter. Are they all basically the same? Do I need to find a Linux compatibility list before I go shopping?
View 1 Replies
View Related
Apr 27, 2010
I want to implement the following scenario :-[workstation1] <--ETHERNET-->[device 1]<--SERIAL-->[device 2]<--ETHERNET-->[workstation2]In short, a LAN over Serial link (RS-232 for instance).If there is a utility that offers such functionality, kindly give me the name, i've googled a bit, and found ser2net, but that only works with TELNETing.. i want it work like a normal LAN like file-sharing n all but over Serial.If there is no such software, then obv i have to program myself. regarding which i have more questions
View 9 Replies
View Related
Apr 15, 2010
can we use inb() and outb() functions for serial port programming ??
View 5 Replies
View Related
May 25, 2011
I'm not a developer or programmer just a user.I'm trying to install a packet radio system using Linux. The TNC is a Kantronics KPC3.The issue I'm having is the communications programs I have tried (minicom and cutecom) do not talk to the TNC. I'm using a computer that has a serial port and it is enabled in the BIOS.I have added myself to the uucp group in an effort resolve this issue.
View 6 Replies
View Related
Mar 23, 2009
I communication with different subsystems using serial port. In some subsystems after running for a while, I start getting invalid data inspite of system sending correct data. For dealing with this situation I used to
reset serial ports by closing and reopening serial port, it was doing the trick but somehow when I have implemented this in my new application, this also doesn't work.
void CPort::
The ClosePort function invokes close system call.
some other way to reset serial port in Linux? I am using RHEL 4, C++ and Qt 4.2.1 for my application development. Also I have used multithreading to implement each subsystem in a separate thread. Its strange that if A,B,C are three threads, A & B run fine together but when C is introduced B starts receiving invalid data after sometime and never recovers even after resetting the port as mentioned above.
View 4 Replies
View Related
Jan 13, 2010
I dot know why my serial port(minicom) is getting hang after some time. again i have to close the terminal and i have to open an new minicom to use my serial port. I dont know why it is getting hang. Please can anuone tell me why it is happening?
View 6 Replies
View Related
Sep 1, 2010
I'm using C serial in a program to open and use a serial port but the port won't open for one reason or another. The program successfully runs on a different computer and when using RealTerm: Serial Capture Program, I can connect through the serial port with the same settings as I'm attempting through my c code. Anyone have any idea why it might be failing? I know this is still pretty vague, so let me know if there's other things I can tell you that might help to finding a solution
View 3 Replies
View Related
Apr 27, 2009
The /dev directory on my system shows the following entries:
/dev/tty
/dev/tty0
/dev/tty1
[code]....
View 19 Replies
View Related
Jan 16, 2010
I would like to be able to ssh to a TCP port on my server and be directly connected to the serial port @ 115200 Null modem config. Does any body know how one can do this?
View 4 Replies
View Related
May 24, 2010
My program tries to open serial port on Fedora 12, and shows "Access denied" on Open Port operation. The same program runs successfully with root rights. What can I do to get COM port access as regular user?
View 2 Replies
View Related
Sep 24, 2010
I think I need to mount a serial device, but not sure how. I looked at /etc/fstab, but cannot determine what to put in for the mount type. And, not sure what port it would be exactly... imagine either "ttyS0" or "tty0". Can someone give a newbie some guidance on how to possibly mount this device?
View 2 Replies
View Related
Jun 7, 2011
have a new HP Compaq 8200 elite. I have a dual boot system. Windows 7 and Fedora 15.In Fedora I cannot seem to connect to the serial port. Could anyone help me with resolving this. I've never had issues with hardware before in Linux so this is a little new to me.
Code:
[matt@matt ~]$ dmesg | grep tty
[ 0.000000] console [tty0] enabled
[code]...
View 3 Replies
View Related
