Any Velleman K8048 Users out there?

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My guess would be still getting garbage from the USB-Serial device. Have you considered a PCI to serial board?

Reply to
scada
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Ooops! You did say laptop. Maybe you can find a PCMCIA to serial card?

Reply to
scada

I've just bought a Velleman K8048 from Maplin which I think is just what I want.

Problem is I built it, lights flash, fantastic. But I can't program with it, I'm using a USB -> Serial Adaptor on my laptop, a straight through cable to the board. The software doesn't see the board, even without a cable plugged into the board 'LD8' the read/write LED lights up, is this normal?

I've plugged a previously programmed 16F84A (With a home made programmer) into the board and it works fine for running through other programs I wrote.

Anyone have any experience with this?

Cheers!

Reply to
Andy Bateman

(USB to serial adapter) != (PC serial port)

Your best bet is to exhume an older PC that has "real" serial (and parallel) ports and use it to drive the programmer.

See the thread at

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that implies that the Velleman doesn't use the serial port as a simple "RS-232" device but does some jiggering with the port signals.

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Rich Webb   Norfolk, VA
Reply to
Rich Webb

Yeh.. That was the answer i was expecting, any thoughts on the read/write light always being lit in prog mode?

Reply to
Andy Bateman

Not other than it's not getting tickled in the way that it's expecting. You might try a logic analyzer to see what's really happening on the programmer side of the interface but that doesn't do more for you than show why it's not working. If the software API isn't cooperating, you're basically screwed (unless you're up to writing your own).

I've heard rumors of USB-to-RS232 converters that behave properly but I don't know of any by brand/model. I don't think that there should be any technical reason why one couldn't be designed to be accessible to non-standard manipulation but I suspect that the marketplace drives the commodity market towards the least expensive, simplest behavior; e.g., bog-standard RS-232 and nothing else. Device APIs that expect to be able to access the 16550 UART registers are likely to be disappointed.

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Rich Webb   Norfolk, VA
Reply to
Rich Webb

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