Re: [CAD_CAM_EDM_DRO] NAMES and EMC

Jon Elson wrote:

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>You don't put position limits on it. It acts as a velocity servo
>system. The
>computer reads position, computes, and outputs velocity. So, the program
>has to do all the acceleration and distance calculations, and decide when to
>begin ramping the speed back down.
>

Perhaps real-time buffer program can do this (daemon)? Then main program
will set the travel distance, speed, and daemon
will make sure its taken care of?
Will study the code now - C is good.
Alex

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>>Can I do it in Basic
>>or C?
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>Sure, but a real time environment with timer interrupts at 1000 Hz or so
>would
>be the best way to go. Actually, the USC has an interval timer that can
>send
>interrupts through the parallel port at 1, 2.5, 5 or 10 KHz (and other
>rates, too).
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>>I browsed your web site but had a
>>hard time getting a relevant info.
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>See http://jelinux.pico-systems.com/univstep.html at the bottom of the page
>click on register definitions. Also, you can see the drivers that I
>wrote for
>EMC at SourceForge, see http://sourceforge.net/projects/emc then click on
>CVS, then "browse CVS tree", then click on emc/, then click on src/, then
>click on emcmot/ and you will see a directory of all the motion interface
>drivers. The most important for the USC board are ppmc_encoder.c,
>ppmc_rate.c, ppmc_dio.c, ppmc_internal.c, and ppmc.h
>These files are used to control more than one type of interface, so the
>symbol UNIV_STEP should be defined to select all the right code and
>consants.
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>>Also sending/getting some I/Os. Do
>>you have a Yahoo group for USC?
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>This gets more complex. All reasonably current PC motherboards support
>the IEEE-1284 protocol in hardware, if the parallel port is set up for EPP
>mode. There are additional I/O ports added to the basic parallel port set
>to activate these functions, which perform handshaked data transfers to
>up to 256 individually addressed I/O device registers through one single
>I/O instruction. ppmc_internal.c has a bunch of C functions to perform
>simple transfers, such as to read the contents of a register or write to
>a specific register. I have an address counter in the USC, so if you
>select an
>address and then write 4 times, you have written to 4 consecutive addresses.
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>No, I don't have a Yahoo group for the USC or PPMC products. Maybe
>it is getting to be time for my own group, though. Especially when I
>bring out the universal PWM controller and PWM servo amps, this may
>be necessary.
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>Jon
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