[En-Nut-Discussion] SD-Card Ethernut3 hangup after insert - electrical problem solved

[ml]

it works´now,

after testing some kind of sdcards i found out that it only happens with
bigger cards (2GB Verbatim).
after inserting the 2GB card npl doesn´t work correct. no npl-interrupts any
more.
even my lcd at the front panel doesn´t work because there is no output from
the cpld-lines i used
for that.  when i examine the npl registers there all zero after inserting
the card.
thinking about the difference between the card i thought that the bigger
cards have much more gates
and more power consumption. 
that´s the whole problem - the 470nF condensator on the board isn´t big
enough to deliver such an amount of current. whith my scope i can see a very
small (some ns) glitch at the 3 volt power line. 
this causes the cpld to reset it´s registers.

attaching a 10µf condensator parallel to the 470nF solves the problem. now
it works with  any card´s
i have. 
only a simple electrical problem.


Martin


ml wrote:
> 
> Hi,
> 
> when i pull out the sd-card and re-insert it my programm stop running. 
> after re-insert i stepped down to 
> 
> Interrupt0Entry()
> after   IRQ_EXIT();  the program and even the debugger hangs up. 
> 
> pulling out the card triggers both insert and remove interrupts (why ?)
> Anyone similar problems ?
> 
> Martin
> 
> 

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