On Sun, Feb 01, 2015 at 07:35:16PM -0500, Jason White wrote:
> I decided I would try to make my STM32F4Dicovery Board program itself
> using the jumpers I was using on my prototype. It failed and I found
> my culprit, the Dupont jumpers I was using. According to my
> measurements (or lack thereof) there is approximately 4-5pf between
> adjacent jumpers at 1Mhz. Separating the clock from the data line on
> the ribbon of jumpers I was using was enough to allow it to work.
>=20
> The strange thing is that I tried this before on my prototypes; I must
> have had some other issues as well.
>=20
> Thanks again,
> Jason White
>=20
> Attached: a terrible, low resolution, 128 color picture of the jumpers
> I was using.

Interesting.  My gut feel is they look a bit long.  How long are they?

Did the ribbon cable supplied with the programmer have intervening
grounds or different conductor to conductor distance?

--=20
James Cameron
http://quozl.linux.org.au/
--=20
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