Tuesday, February 05, 2008


A new adventure begins

I ordered the parts to make the new USB controller board. The hardest part was finding the USB Type B connector. After getting a look at what they are charging for USB cables I suspect that I'll be making up my own from scratch as well. I'm going to be needing a particularly long one.

I'm trying to get my head around what the firmware for Tommelise 2.0 needs to look like when all the really tough calculations can take place in my PC. The bandwidth on the USB port is going to be several magnitudes larger than the old serial interface, so it looks like the PIC is going to spend most of its time simply shoveling in data in a form more or less ready to use by the SN754410 chips and keeping track of things like the limits detectors. I'm thinking that I might well try to run each of the SN754410 chips with a smaller PIC like the old 16F628A. That would let give me fewer worries about pin counts on the 18F4550. How I put that all on a Euroboard is another issue. I expect that I am going to have to make smaller boards for the individual stepper controllers. Oh well, well see how that works out as I get further into the project.

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