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Hello
How can I increase the speed limit in world coordinates?
And what is your reason for putting this speed limit?

All in all i was happy with what the machine could do. looking at a picture of a small tool and holding one in your hands is two different things  

Ok, i will have a look coming time if i can help you a bit.

Sorry I haven't, I changed the interface on my Mesa board copy to EPP and put the RPi5 in a drawer.

Grotius wrote:

@JT,

Do you want to code a new plotter or what are your ingredients?
 

I need to get a plotter to work with PyQt6. I would like to use OpenGL with the QOpenGLWidget. If possible use LinuxCNC libraries to parse the G code. How Flex GUI works is if a widget is found then the code is attached to it so in the case of a plotter if a container with an object name of plot_widget is found then the plotter is inserted into the plot_widget container. Any help is much appreciated.

JT

@JT,

Do you want to code a new plotter or what are your ingredients?

Subsidiary question: where can I find a list of functions of this type that can be called from a script?

The best way is to look in the Axis Python code: github.com/LinuxCNC/linuxcnc/blob/master...cripts/axis.py#L3267

But whilst there is a set_feedrate (look for def set_feedrate) I don't see a matching function to set the jog increment. Instead the increment is set simply by reading the value from the UI element.

You can probably add code in the .axisrc file to both bind a key to a new set_increment function and to define that function. But I haven't experimented to see how that would work.

"I seen the official LinuxCNC image for RPI5 and its stated that its for SPI and Ethernet. So I bought rpi5. But after installing official image I found its not working. Later in forum I found SPI working was wrongly mentioned."

Sorry about that. I have updated the Downloads page to no longer claim that SPI works with the Pi5. 

I would recommend connecting the parity pin. It will give some protection if a wire breaks or a sensor fails. The carousel component understands how to interpret the parity input.

I last used Axis which had a hot key but can't find one here, as a start

Try the spindle buttons:

Has anyone tried the hal_gpio driver on Pi5? (I don't think that I have)

In theory this should work, but there may be issues with the PID "rattling" in the backlash.

If you look at the LinuxCNC config you will probably find that it already contains a PID for each axis, and all you have to do is switch the feedback to that from the stepgen calculated position to the scale measured position. Some re-tuning might be needed.

Cartesian or galvanometer?

It looks like modbus doesn't actually have the concept of negative numbers, (based on a quick web search)

If you are using a Mesa card then you could consider using mesa_modbus as that automatically re-wraps the 16 bit value into a signed value (github.com/LinuxCNC/linuxcnc/blob/master...a_modbus.c.tmpl#L773 )

Looking through the mb2hal code I don't see anything with looks to do this wrap (but it is possible that I missed it)

It's not an elegant solution, but a custom HAL component could be written to do the conversion.

linuxcnc.org/docs/stable/html/hal/comp.html

The spidev driver is not an option. The man page in the docs states that it is not suitable for real-time threads. Hence the reason you are having issues.

To put it clearly SPI, atm is not an option for the RPi5, no matter what the download page states. Mesa states that the RPi5 is unable to be used with the 7c80 & 7c81 on the respective product pages.
The Raspberry Foundation has only released limited information regarding the RP1 chip. So until this issue resolved we are stuck.
Whether a driver will be developed I can not say.
Long story short there is no help currently available.
To use the RPi5 with Linuxcnc the Ethernet port with a Mesa card would be the easiest route. The gpios may be an option but I haven’t tried it. I’m unsure if on of the Mesa PCIe cards would work, it would be an expensive experiment. A PCIe Parallel Port adapter is not an option, Jeff Gerling has tested many PCIe cards with the RPi and the arm architecture doesn’t support BAR has needed by Parallel Port cards.
It’s not just Linuxcnc that the RPi5 has been a bit of a letdown, many other people have found that many of the old libraries that use the various peripherals on the gpios don’t work until the libs have been re written and the apps & code that use them.
We just have to wait for the Code Gods to arrive.