Self clocking protocol for micro debugging?

Question

Hi, Tried googling on this, but predictably everything is way too complex. I'm looking for a simple, low speed (few hundred b/s would do it) self-clocking protocol that I can use to dump debugging data from tiny micros that are under test. Single line, tolerant to uncertain clock frequencies and not too complex because the Tx end doesn't have huge amounts of program memory available. Any suggestions before I go and develop my own?

Jasen Betts · Accepted Answer

if your clock is reasonably stable you could probably use asynchrononous serial (like rs-232)? the worse you clock is the fewer data bits you can fit.

morse code?

what attaches to the other end of the wire?

Bye. Jasen

Andy Wood · Answer

Freescale (ex Motorola) BDM perhaps? I have no idea whether you wouldconsider that to be too complex though.Andy Wood

Don McKenzie · Answer

Morse code?not that silly.you can do a lot with a single output pin, a LED and a resistor.Was what I used for many years to debug micros.or spit a serial stream at a serial LCD, if you want some sort of dump. let the serial lcd gobble up most of the hard coding, and memory overhead. but then, this may not confirm to your uncertain clock frequencies.Cheers Don...-- Don McKenzieSite Map:             Contact Page:  1000's of electronic items

Andy Wood · Answer

. . .. . .Indeed. Look how some people have got their hands on the firmware fora device like a  camera by  managing to load into it their own programwhich does nothing more than blink some existing LED indicator. EG"Hardware-software solution" at  (Canon cameras). Andy Wood

David L. Jones · Answer

Dallas/Maxim 1-Wire would have to be a good choice here. be plenty of code available for your chosen device andlanguage.Dave.

dmm · Answer

ManchesterLIN - just use the basics, not the whole shebang.

Self clocking protocol for micro debugging?

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