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I’m using a raspberry pi 5 8gb with the latest 2.93 image that’s linked on the first page of this thread. I’ve attached a screen shot of what I’m getting when run the commands. 

Wow, thank you @cornholio! That will make it much easier for us
@PCW thank you as well for the info.

Did you run the commands I suggested and post the output ?

What RPi are you using ?
What Linuxcnc img are you using ?

It’s only showing 11 & 12, I can’t get 1 to show.

I’m pretty sure I’m using the latest kernel though.
6.6.44-rt39

Too hard to edit

[ls -la /dev/i2c*[/code]

Would be good to see permissions, not that should affect sudo.

I'm working on a Rpi5 with an image I built myself from rodw's image builder

This is my kernel.
Linux raspberrypi 6.1.69-rt21 #1 SMP PREEMPT_RT Fri Jan 17 10:39:48 AEDT 2025 aarch64 GNU/Linux

Before I finalised my post I checked running by running
As I have nothing connected I got this:
sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --


What doesshow ?

/dev/i2c-1 /dev/i2c-11 /dev/i2c-12

I was able to enable i2c, but the instructions say use “sudo i2cdetect -y 1”, 1 doesn’t seem to exist for me, I can only detect 11 and 12 and neither show the 0x36 address.
I have confirmed that the pins are making good contact, so bad connection is ruled out.
Could it be the kernel configuration?

To turn on i2c

edit as superuser /boot/broadcom/config.txt and uncomment the lines relate to i2c.

then edit as superuser /etc/modules and either add i2c-dev or uncomment if it is commented out

reboot

That will get i2c up and enabled

Hey guys, I’ve add a Geekworm x1201 UPS to my Pi5 as I often get power outages at my place and wanted a bit of extra security.
I was able to access and change the EEPROM to get it to charge and power the pi5 from the batteries. But to change anymore detailed settings, like battery monitoring, It’s telling me I need to open Raspi-config. Which I obviously can’t using the Linuxcnc image. 

Here a link to the detailed instructions, suptronics.com/Raspberrypi/Power_mgmt/x120x-v1.0_software.html
unfortunately it’s all for the Raspberry Pi OS. 

Is there anyway I can make this work or am I wasting my time? 

 

The biggest issue is that Linuxcnc will require building from source as the RPi5 images don’t have Linuxcnc packages built from the most recent code base. Editing config.txt to turn on spi is a trivial matter.

Give me a day or 2 and I’ll generate an image with the most recent Linuxcnc & Mesaflash.

The 7C80 will work with the RPI5 using the hm2_spix driver.

Note that some 7C80s were shipped with firmware that does
not work with the RPI5. These cards can be re-programmed
on a RPI4 if that's convenient. All the distributed bitfiles are OK.
 

Hi all, 
after swapping our Raspberry Pi4 with a 5 things didn't work anymore as they did before, and thanks to this forum, as far as I understood there is no SPI support yet, right? 
I have also read that "rodw" you have created an image builder, and "Cornholio" you managed to patch it so it works right?
As we are trying to run the mesa 7c80 with a Raspberry Pi5, is there an image available currently that supports this combination? If not what would be the steps to "patch" it together? 

Thanks a lot in advance 

With the 5A-75B and 5A-75E we have a low cost way of creating a driver board for Linux-CNC. Based on the work of Romanetz, the project  LiteX-CNC  was started, providing a easy customizable firmware and driver to use these boards. The down-side however is that these boards require some soldering work to be done to accept inputs; I've messed up some boards in the process....

Therefore, Litex-CNC is going to be expanded to accept more FPGA's, starting with the Sipeed Tang Nano 20k. Compared with the 5A-75B it has less outputs (28 compared to 48 for the 5A-75B), but this is still enough for a simple 3 axis machine. The big advantage is that no SMT soldering skills are required to get this board up and running.

For the Raspberry-Pi I've designed a HAT, which provides:

• 7 extended PMOD-connectors. Each connector has 4 GPIO, power rails (+5V, max 200 mA) and a buffered enable signal;
• RS489 connector for communicating with for example a VFD;
• communication between Raspberry PI and FPGA using SPI in bidirectional mode (3-wire) to save on pins;
• conforms to the HAT+ specification , including a EEPROM with settings.

With the PMOD-connectors one can easily connect to break-out boards providing stepgen, GPIO (12V/24V inputs and outputs), differential encoders, etc. I'm also working to provide support for shifting data out (74HC595) and in (74HC165).

An estimation of the HAT will be around 7 Euro's, excluding the Tang Nano 20k. Inlcuding the FPGA, the price would be around the 40 Euro price point.