On 22/09/13 15:06, Chuck McManis wrote:
So when ever I reset my board I get 'junk' that comes out of my serial
port. I've not quite gotten to the point where I can capture it on my
scope yet but its annoying.
I've been using the STM32F4-Discovery board, USART6 in this case, and
something during my reset sequence seems to generate junk before stuff
that I send for "real" actually appears. Wondering if anyone else had
seen that?
Not sure if I can be helpful or a nuisance. I can only verify it doesn't
happen on the STM32F103 boards I have. Capturing it would tell if it
comes during or after the reset. A single glitch or down transition
could be interpreted as a start bit. Do you have hardware drivers? Are
you seeing it on the CRO or receiving it? A good serial debug tool might
be helpful to see what it contains if you don't have a storage CRO. If
it's important to your application I don't mind checking it out on
Tuesday and see if it's a "feature" of those boards.
Ken
--Chuck
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