keith
I’ve been thinking more and more about how exactly I’ve been losing data. It’s alot of data. The worst case I’ve seen is about 140 bytes. This is 1120 bits, or 2240us. This is a LONG time for my...
more updates
I know I’ve been bad keeping you guys updated….. This doesn’t mean I haven’t been working on it, however. I recoded the ISR completely in assembly because I was just plain sick of the damn...
new book
I picked up a copy of Reversing: Secrets of Reverse Engineering this past weekend. I have about 5 or 6 chapters read. All very good. It was published April 2005 or thereabouts, and so its much more updated than the book...
timing movie
I have uploaded a movie showing 30 seconds of input signal vs detected result. I checked this frame by frame and I didn’t find a single error. I still can’t figure out why I have output errors. Maybe you can...
new timing image
I think this is timing from like 97 or so, and this is pretty good. I’ve switched to 93 for the time being, because I’ve had the best results with that. This still shows accurate reading of this particular...
current results
Now that I have a portion of Marco’s old code implemented, I’ve run an output file from my SX through it. It’s one whole track from a capture of a DiskMonTools. It’s almost 14k long, which sounds...
of bit-shifted sectors
I’m beginning to think more and more that my software on the SX is just fine. Perhaps minus the idle routine mentioned in the last post. I have to do something there. However, without the idle routine, I was only...
funky idle routine
I’m making some progress. On a whim, I told my software to never go idle, to simply stream data constantly. I’ve never liked how I handle the idle state, and I currently lose whatever data thats in the shift...
Creating more test disks
From both Tim’s suggestions and from a reinforcement from Agans’ Debugging book, Chapter 6, “Divide and Conquer”, they suggest to “Inject Easy-to-Spot Patterns”. And of course, I knew...
Hardware and code diagram
I’ve thrown up a PDF that shows the basic hardware setup. It also shows the flow of my software, which is very simple. I didn’t put the clock details on there such as how often the clock rolls etc because...
review of timing details
I set up a couple more hardware flags on my software so I could see things like, edge detections vs rollover detections vs PC transmissions, etc. It all looks perfect to me. I took maybe a dozen different samples...
still no better
Well I’ve decided that my current approach just isn’t improving the situation. And despite help from a lot of people, I’m no better off than I was a few weeks ago. I happened to stumble upon...
Changes to the PC side
With more and more things pointing to the PC, I’ve decided to really reduce the amount of work the PC has to do in its receive loop. I looked at Marco’s because his was designed to run (albeit in dos/dos...
I’ve played around a considerable bit from yesterday. There’s something very strange about the speed the PC can react in certain circumstances, and I can’t quite nail it down. Now I haven’t...
PC might be the problem!
I think I’ve found at least one problem here. My PC is at least one problem. Even though I’ve done extensive tests with the PC in the past, including measuring a 9us total cycle time, it appears the PC must...
still hashing some ideas around
I’ve been getting lots of good ideas from the smart guys over at Parallax. They are throwing out a variety of methods and ways I can get this job done. I will say that I’m a little overwhelmed at the pure...
new design on SX software
Welp, I’m having trouble tweaking my existing SX code. If I modify the timing of the current code, I’m getting all garbage output — even adjusting small amounts to one side or the other, produces much...
