Parport read and write problem

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16 Oct 2013 17:14 #39947 by ztj_1
I want use the HAL component parport to (just read/write data) communication with my sigle-chip board.
Does it possible for me to do it without modify the sorce code?

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16 Oct 2013 18:40 #39952 by andypugh

I want use the HAL component parport to (just read/write data) communication with my sigle-chip board.
Does it possible for me to do it without modify the sorce code?


Do you want to write "data" or set individual pins?

The hal_parport module is intended for setting and reading the values of individual pins. I suspect that you want to send data bytes, and the hal_parport component is probably quite a bad choice for that.

What is the data protocol to your board?

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16 Oct 2013 18:41 #39953 by ArcEye
This is what it does, does that meet your needs?
www.linuxcnc.org/docs/devel/html/hal/parallel_port.html

If not you will have to write your own driver to send and receive data packets, or whatever it is you want to do.

regards

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16 Oct 2013 18:58 #39955 by ztj_1
Thank you for your help,
As I asked in the previous question in
www.linuxcnc.org/index.php/english/forum...nuxcnc-on-preempt-rt
Now I'm trying to use rtai kernel, and I have already installed linuxcnc in the kernel 2.6.37+rtai39.

But now, I want use parallel port to do the close loop control for servo motor, so I need to read the feed back data.

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16 Oct 2013 19:16 #39960 by andypugh

But now, I want use parallel port to do the close loop control for servo motor, so I need to read the feed back data.


Have you seen emergent.unpythonic.net/projects/01142347802

The config files are included with LinuxCNC as a sample config, called "etch-servo"

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