On 07/20/2012 11:47 AM, Jon Elson wrote: > Charles Steinkuehler wrote: >> My current plan is to bit-bang GPIO pins based on code from the parallel >> port driver, but >> adding a bit of electronics would probably make things much easier.
What would the "bit of electronics" look like? Most of the single chip uP have hardware pulse generators built in that could easily generate the stepper pulses without jitter. Those chips are under $1 these days... Lattice now has a 1000 logic cell FPGA with built in configuration ROM and lots of other goodies for less than $2 .. (twice that in single quantities from digikey ) there is enough room to put a softcore CPU to talk to the controlling system etc.. If I have this pictured correctly - the controlling Linuxemc system would run the outer servo loop - and the hardware would generate the pulses for steppers? Hardware cost is no longer an issue. -------------------------------------------------------------------------------- Karl Schmidt EMail [email protected] Transtronics, Inc. WEB http://secure.transtronics.com 3209 West 9th Street Ph (785) 841-3089 Lawrence, KS 66049 FAX (785) 841-0434 Any cat would tell you that you can only wash one paw at a time; while we try to do everything at once. -kps -------------------------------------------------------------------------------- ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
