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  • unknown
  • unknown
17 Aug 2025 22:06
Replied by unknown on topic getting started , latency and breakout board questions

getting started , latency and breakout board questions

Category: General LinuxCNC Questions

Logout out then log back in, then you'll be good for your permissions and group membership.
  • Chock
  • Chock
17 Aug 2025 21:38 - 17 Aug 2025 21:48
Replied by Chock on topic getting started , latency and breakout board questions

getting started , latency and breakout board questions

Category: General LinuxCNC Questions

Good afternoon Tommylight thanks, I tried something pretty similar to this with out the < > .

That was several tries back

i just tried it and i added the < > with my username in the middle of the<> and i got a
bash: syntax error near unexpected token 'newline'

next i tried without the < > and i got asked for my password,       that is good correct?

i made a typo next, trying the stty -F /dev/ttyS0

and on the 2nd try with the stty i got permission denied again.

if i make a typo do i lose my root access? and need to start over with dialout line ?

i tried the whole process starting with the  " ls " again,  no typos and still permission denied

Since the command line has my name twice that means i am logged in correct?   does that mean  i am logged in a both user and admin?
  • tommylight
  • tommylight's Avatar
17 Aug 2025 20:58
Replied by tommylight on topic getting started , latency and breakout board questions

getting started , latency and breakout board questions

Category: General LinuxCNC Questions

ls -l /dev/tty*
then
sudo usermod -a -G dialout <username>
replace "username" with your actual username on that pc
  • AkkiSan
  • AkkiSan
17 Aug 2025 20:52
Replied by AkkiSan on topic How to fix "Queue is not empty after probing"

How to fix "Queue is not empty after probing"

Category: General LinuxCNC Questions

A lot of things could go wrong there; why not check the "obvious error" ```[tm]``` first?  
Probably just a race condition?
[...]

if (settings->probe_flag) {
    int queue_empty = 0;
    int retry = 0;
    static int probe_count = 0;
    
    probe_count++;
    
    while ((queue_empty = GET_EXTERNAL_QUEUE_EMPTY()) == 0 && retry < 100) {
        esleep(0.010); 
        retry++;
    }
    
    if (retry > 0) {
        logDebug("probe #%d: waited %dms for empty queue (state: %d)", 
                probe_count, retry*10, queue_empty);
    }
    
    CHKS((queue_empty == 0),
         "NCE_QUEUE_IS_NOT_EMPTY_AFTER_PROBING (probe #%d after %dms)",
         probe_count, retry*10);

[...]


Out testing,
AS
 
  • Chock
  • Chock
17 Aug 2025 20:47 - 17 Aug 2025 20:51
Replied by Chock on topic getting started , latency and breakout board questions

getting started , latency and breakout board questions

Category: General LinuxCNC Questions

Good afternoon I have a question,   It is both linuxCnc, and just Linux.
      First   I have been running LinuxCnc from a  Startup Boot thumbdrive.    I had a friend help with the original Linux install, and LinuxCnc install on this computer  Lenovo intel g73.   
     At some point I think  i would like to get rid of the thumbdrive boot ,  and have this computer just run linuxCnc , or if possible Linux Debian 12, and LinuxCnc .     But for now i am pretty happy with the LinuxCnc on the thumbdrive and i have  Linux Debian 12 without the thumbdrive. 

I am still learning both Linux and LinuxCnc for sure.    
     I have a very old robot arm that i can run on a windows terminal .   I ASSUME i should be able to run the arm from a Linux terminal????   

BUT

I can not seem to change the serial port parameters in either Linux, or LinuxCnc.    
I have tried several times to change the serial port parameter with various different terminal  commands? 
    I have tried
             "     stty -F /dev/ttyS0 57600 cs8 -parenb -cstopb   "     i have also tried to add " sudo" in front of the line.
i always get permission denied.
    I believe i have root access,   but maybe not.    i have tried to change my user status to  a  " ALL "   and some other things,  but no luck

I am not sure if this is a problem with my install,  or if i need a more potent permission .

I thought i was the only user on this install and i thought i have    "  ALL access"   but apparently I don't..

Shouldn't i have the same access in linux and LinuxCnc

i did mange a command that listed all my permissions and i am pretty sure i have at least admin level   

how can i get permanent root access

thanks


 
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