Parallel port problems on new build; pins 14 and 16 not working for spindle

PCW
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04 Jul 2019 12:55 #138621 by PCW

Replied by PCW on topic Parallel port problems on new build; pins 14 and 16 not working for spindle

"epp" mode is in the hal_parport manual page, and works for me ( it loads anyway... )

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andypugh
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04 Jul 2019 13:18 #138624 by andypugh

Replied by andypugh on topic Parallel port problems on new build; pins 14 and 16 not working for spindle

So it does!

linuxcnc.org/docs/2.8/html/man/man1/hal_parport.1.html

I suspect that it might still need to be set in the BIOS?

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PCW
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04 Jul 2019 14:18 #138625 by PCW

Replied by PCW on topic Parallel port problems on new build; pins 14 and 16 not working for spindle

Setting it in the BIOS only works on built-in motherboard ports.

If the parallel port follows the standard register map, its possible to set
the mode with direct port access. Not sure how hal_parport does it.
I'm wondering if it uses a linux parport driver call which would fail
if the parallel port was not detected by the linux parport driver

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andypugh
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04 Jul 2019 14:36 #138626 by andypugh

Replied by andypugh on topic Parallel port problems on new build; pins 14 and 16 not working for spindle

PCW wrote:
If the parallel port follows the standard register map, its possible to set
the mode with direct port access. Not sure how hal_parport does it.

Direct port output (outb)
github.com/LinuxCNC/linuxcnc/blob/master...s/hal_parport.c#L595

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PCW
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04 Jul 2019 15:19 #138628 by PCW

Replied by PCW on topic Parallel port problems on new build; pins 14 and 16 not working for spindle

Yeah so why the error message?
I'll try to duplicate this but will need to buy a couple PP cards
Pretty sure I've thrown all the ones I had out when we moved

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andypugh
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04 Jul 2019 16:51 #138633 by andypugh

Replied by andypugh on topic Parallel port problems on new build; pins 14 and 16 not working for spindle

Can you try loading just one p-port, then the other?

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trebuchetguy
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04 Jul 2019 17:05 #138635 by trebuchetguy

Replied by trebuchetguy on topic Parallel port problems on new build; pins 14 and 16 not working for spindle

Will do! It will probably be tomorrow before I get a chance to.

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trebuchetguy
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05 Jul 2019 02:32 #138661 by trebuchetguy

Replied by trebuchetguy on topic Parallel port problems on new build; pins 14 and 16 not working for spindle

Same error message when setting a single parallel port with epp mode, except that it only shows the error message once.

I'll work on putting on some pull up resistors on those pins now.

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PCW
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05 Jul 2019 04:56 #138672 by PCW

Replied by PCW on topic Parallel port problems on new build; pins 14 and 16 not working for spindle

What version of LinuxCNC?

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trebuchetguy
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06 Jul 2019 00:39 #138713 by trebuchetguy

Replied by trebuchetguy on topic Parallel port problems on new build; pins 14 and 16 not working for spindle

2.7.14

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