On 22 December 2010 15:11, John Thornton <[email protected]> wrote: > I'm reading up on bit banging now.
I am almost surprised that there isn't already an SPI bit-banging comp for EMC2. As long as the components are flexible in their timing then shifting one bit per base thread ought to be pretty easy. I did some back-of-the-envelope sums to see if you could run a blocking function in the servo-thread to twiddle the bits at 500kHz, but it is just that bit too slow to consider really. You would need a system with a 1000nS bas thread to bit-bang at 500kHz, but you would need to be able to accept a 16uS function runtime in the servo thread to run it standalone. (it would also need to bypass the parport driver, and I don't know what the inherent limits of parports are as regards frequency) There is already an SPI (And buffered SPI) module in Hostmot2, but no driver support as yet. -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ Forrester recently released a report on the Return on Investment (ROI) of Google Apps. They found a 300% ROI, 38%-56% cost savings, and break-even within 7 months. Over 3 million businesses have gone Google with Google Apps: an online email calendar, and document program that's accessible from your browser. Read the Forrester report: http://p.sf.net/sfu/googleapps-sfnew _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
