On 9/20/16 11:12 PM, Jon Elson wrote: > On 09/20/2016 06:27 PM, hubert wrote: >> Jon >> >> I ordered some QSE159's to use as detectors and some ir leds for >> generating turn on. I have an FPGA board and some arduino's to try for >> the control logic. One question. If an FPGA can be used for the >> control logic, couldn't the FPGA on the Mesa card be programmed to >> include this? > Undoubtedly so. But, I am a competitor to Mesa, and so tend > to use my OWN gear! I understand your preference. The Mesa boards was the LinuxCNC Options Skyfire offered when I ordered my machine. The FPGA development board I picked up to start my probe work has the Xilinx XC6SLX9 TQG144 FPGA. > I have a board with a Spartan XC3S50AN, a small FPGA with > built-in config EPROM that I usually sell as a converter for > Fanuc serial encoders. It had just the right complement of > input and output converters. > > If you know FPGA programming, then dive right in. That's an > art not too many CNC guys are up to speed on. I won't claim I was ever an expert, and I am certainly cold on the subject. I haven't fired up a development kit since I retired from teaching Computer Engineering in 2008, but we used the Xilinx Spartan and Vertex families for introducing our Students to embedded computing. >> I do think initially this should be done separately until >> everything is well understood, but it just doesn't appear that should be >> very complicated in FPGA terms. >> > No, the trouble with the Blum probe was figuring out exactly > what it wanted for turn-on and turn-off. > I was flying fairly blind, and just increased and decreased > pulse width, pulse frequency and burst length until I got a > reliable turn-on/off. I started with a pulse generator, and > when I had come up with boundaries on all these, I set the > FPGA for the middle of those ranges. It will be a while before I will start getting results. I need to pick up the Mill and then find a way to get it into my shop. The shop is a converted bedroom with only a 36" door opening out on a backyard Patio. With luck we will get it wired in this weekend, with probeand parts should arriving Early Next week. > Once the probe was turned on, figuring out the output data > pattern was completely trivial. > > Jon > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > >
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