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?
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
Freescale (ex Motorola) BDM perhaps? I have no idea whether you would consider that to be too complex though.
Andy Wood snipped-for-privacy@trap.ozemail.com.au
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...
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Indeed. Look how some people have got their hands on the firmware for a device like a camera by managing to load into it their own program which does nothing more than blink some existing LED indicator. EG "Hardware-software solution" at
Andy Wood snipped-for-privacy@trap.ozemail.com.au
Dallas/Maxim 1-Wire would have to be a good choice here.
Dave.
Manchester LIN - just use the basics, not the whole shebang.
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