AT91SAM7S256 SAM-BA startup problem
- From: Stef <stef33d@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 31 Jan 2007 21:48:40 +0100
I have designed a board with a AT91SAM7S256 on it and intend to program
it using the SAM-BA boot program. As I understand it, you need power,
a crystal and you should be able to load a program over the serial line.
Add a litlle pull-up circuit and choose the right crystal and it can be
done through USB.
I have used the SAM7S-EK and that works fine, serial and USB. But my own
boards sometimes works and sometimes not. If using USB, in some cases the
PC sees the board immediately after powerup, sometimes it may take a
very long time (minutes). The same behaviour is observed when using the
serial connection. The oscilator is running fine.
When I (finally) have my own software loaded, this will always start
immediately.
I've measured and scoped the power lines, osc, reset, tst, erase, but
have seen nothing out of the ordinary. Schematic is the same as the EK
with respect to the boot loader part.
Any suggestions or simular experiences here?
I've already mailed our FAE, but he has forwarded my question to Rouset,
hope they get back to me soon.
--
Stef (remove caps, dashes and .invalid from e-mail address to reply by mail)
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