failed to open parellel port

arundhyoti · 07-09-2012, 01:40 AM

Hi all

I am really new to Linux. I am trying to run a code on Atmega8 via parallel port.
everytime i execute make flash, gives an error

avrdude: can't open device "/dev/parport0": Permission denied
avrdude: failed to open parallel port "/dev/parport0"

So seems like need to install few files. how? and what? Please help!!!

zhjim · 07-09-2012, 02:03 AM

You get an 'Permisson denied' error. So it seems that the user you are running avrdude as does not have the permission to access /dev/parport0.
Please provide the output of ls -lh /dev/par* or try running the command as the root user.

To be more of help it would be good if you provide the name of the distribution you have in use.

arundhyoti · 07-09-2012, 02:45 AM

Well I am using Ubuntu 12.04

I was doing my search meanwhile. Have resolved the problem for now.

mknod /dev/parport0 c 99 0

and had to change permission from root using

chmod a+rw /dev/parport0

which i could not since i dont have access to root.

So went to the directory containing my .c file typed following commands.

make
sudo make flash

This worked!
So I am thinking when i made the device node, access permission was granted by default since i am the only user.

thanks for you reply

Cheers

zhjim · 07-09-2012, 02:55 AM

Great you go it sorted.