[En-Nut-Discussion] Ethernut 1.3H External RAM problem

[Ayman Hendawy]

Hi,

I will Change the uC, as this is my only choice  but what I can't
understand, why when I read the MCUCR register, I found SRE bit is Zero, I
expect that this bit is already set in nutinit.c "NutInitXRAM()", in the
nut initializing phase.
The same for XMCRA register is also zero.

However if I set those registers, then read there values, I get what I have
written before, what does it mean?

Thanks

On Thu, Dec 20, 2012 at 3:32 PM, Ole Reinhardt <ole.reinhardt at embedded-it.de
> wrote:

> Hi!
>
> > so now I have Ethernet & Buffer ICs working, but the SRAM chip not
> working.
> >
> > do you think that the over voltage , may burn some lines between SRAM and
> > uC?,
>
> Yes it is very likely that the µC got destroyed internally. Each µC pin
> is bonded to the silicon dye with very thin gold wires, they might got
> burned internally in the chip. And also some single pads might got
> burned internally while the rest of the µC is still working.
>
> >  recently I noticed some strange behavior for the uC, e.g: I can't do
> > any while loop that include any kind of delay, I can't blink led with
> time
> > delay 1 sec, also it's supposed that most of applications that doesn't
> > have Ethernet code to work fine without external RAM, however I just can
> > run only Basemon application only, any other simple application  doesn't
> > work on my uC, what does't mean?
>
> That might mean that the timer peripheral got destroyed as well.
>
> I would strongly suggest to replace the µC as well.
>
> Bye,
>
> Ole
>
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-- 
Best regards

Ayman Hendawy
Embedded system engineer

Cairo,Egypt

Phone: +20110406659