[En-Nut-Discussion] Safe reset...

Czerteak czerteak at email.cz
Tue Oct 14 22:17:45 CEST 2003


Hi,

is there a safe a way to reset the Ethenut board? Currently, when I set the 
ports (port D in my case) to 0xff (all pins enabled) and then push the reset 
button or unplug and put back the power supply, the port pins get to 
undefined state (my opinion) which causes a quick flash during the boot-up (I 
think even before the OS get started). When they're set to zeroes before the 
reset action, when I use the reset button, the don't "blink" on startup but 
the procedure with power supply makes them "generate" that "pulse" anyway. I 
don't have any oscilloscope to take a look at it but I suppose the pins are 
undefined state during the boot (neither 0V nor 5V - randomly). 
Unfortunately, there flashes are deadly for me. I need the circuitry to be in 
defined state ALL the time. Do you have any ideas what to do?

And another quick note. When I use my external circuit to generate a short 
pulse to pull the reset signal to zero (the reset button should do the same), 
it works fine! I don't understand that... :-(

Thanks a lot...
Czerteak




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