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hi，here's another question. I want to read from and write to the module (for example the shared memory module in realtime space) through pins in user space.How can I solve the problem? Is there any code about this?

sadly so yes, although i cannot help but think there must be a simpler way to do this with mux, just somehow switch between position and velocity modes depending on an input

its fairly complex...

You might take a look at this, using the orient component.

forum.linuxcnc.org/10-advanced-configura...is-from-inside-gcode


 

I'll have this information for you tomorrow.

Thanks for the help.

if you can run

and attach the lspci.txt file (photos are difficult to work with if you want a proper answer) and I can give some answers.

Just gone 3pm here in Sydney.

No something interesting.

I worked on a little project using an FPGA dev board to run MESA's hostmot2 firmware. First attempt was based on the 7c81 using either SPI (raspberry pi) or EPP (best on motherboard based parallel ports). The issue with the board I used is that the EEPROM need to be changed and the headers were already soldered on.
That same hardware can also be used with the LinuxcncRIO project.

Another project I had a go at was modding the 7i90 Smart serial firmware to support 4 encoders to run on a dev board.

For my latest I've grabbed a different dev board (eeprom is correct size & bought with the headers unslodered, but this time I'll be trying a Ethernet interface, chip is same as use on the Mesa products, so no having to rewrite a driver, which requires a couple of steps, first being working out the instructions of the softcore, working how the driver talks to the chip and then how it integrates with the rest.

Some pics, 2x17 ports from breakout boards (mesa 25 pin daughter boards can be used as well) and 4 extra pins for 2 smart serial ports or extra I\O.

First off is the FPGA from aliexpress:
 

The Ethernet board, this is experiment only, the FPGA board sits on top, disregard the type of 2x25 headers they can be changed to suit. Should have the boards in a couple of weeks.
 

One of the daughter boards from the orignal project.