EMC & 2nd parallel port
Posted by
Tim Goldstein
on 1999-07-04 00:14:39 UTC
I am trying to get EMC to drive various pins on the parallel port high or
low to be able to switch on mist coolant and the power supply to my stepper
controller. In talking with Fred Proctor he told me that I need to use LPT2
so I have set up a 2nd parallel port as 0x278. I have done all the things
outlined in the message from Fred that follows and when I use the testppt
utility I can toggle the 2nd port just fine. I have added the following to
my run script for EMC:
# run shvio in background
echo "spawning shvio..."
plat/linux_2_0_36/bin/shvio -ini mylathe.ini &
sleep 5
echo "...done"
Along with the corresponding piece in the exit section. My
PARPORT_IO_ADDRESS in the run file is 0x378 and in the ini file it is 0x278.
Here is what happens: the pin starts low, when I start EMC the pin for mist
now goes high, but toggling the mist in EMC does not get it to go low. If I
remove the lines starting shvio the pin starts low, stays low and can not be
toggled.
What am I missing?
Tim
[Denver, CO]
low to be able to switch on mist coolant and the power supply to my stepper
controller. In talking with Fred Proctor he told me that I need to use LPT2
so I have set up a 2nd parallel port as 0x278. I have done all the things
outlined in the message from Fred that follows and when I use the testppt
utility I can toggle the 2nd port just fine. I have added the following to
my run script for EMC:
# run shvio in background
echo "spawning shvio..."
plat/linux_2_0_36/bin/shvio -ini mylathe.ini &
sleep 5
echo "...done"
Along with the corresponding piece in the exit section. My
PARPORT_IO_ADDRESS in the run file is 0x378 and in the ini file it is 0x278.
Here is what happens: the pin starts low, when I start EMC the pin for mist
now goes high, but toggling the mist in EMC does not get it to go low. If I
remove the lines starting shvio the pin starts low, stays low and can not be
toggled.
What am I missing?
Tim
[Denver, CO]
> -----Original Message-----
> From: Fred Proctor [mailto:proctor@...]
> Sent: Wednesday, June 30, 1999 11:25 AM
> To: timg@...
> Subject: Two Parallel Ports
>
>
> Tim,
>
> I got a second parallel port adaptor, set it to 0x278, used it with the
> "shvio" IO controller in tandem with a parallel port at 0x378 for
> stepper test stand. I set up the script to pass
> "PARPORT_IO_ADDRESS=0x378" to the stepper controller, and set up the ini
> file with [EMC] PARPORT_IO_ADDRESS = 0x278 for the IO controller, and it
> worked OK.
>
> Were you able to get this to work? There is a simple parallel port test
> program, emc/plat/linux_2_0_36/bin/testppt. Run it with "testppt -addr
> 0x278", or "testppt -addr 0x378" and it will bring up a prompt. Entering
> a blank line shows the 5 inputs. "s <0..11>" will set the corresponding
> bit (0 through 11, 12 total), "c <0..11>" will clear it, e.g., "s 0", "c
> 3". Nothing is done with the polarities, so I think bits 8-11 are
> inverted outputs, bit 0 is inverted input, or something like that. If
> you run this and don't see any changes on your parallel port then maybe
> there's a hardware or BIOS problem.
>
> --Fred