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PICList Thread
'[OT] Logging systems'
1999\07\04@200527 by netquake

I would be thankful if any engineer on the list could give me a
basic background theory on how to implement logging of reasonably
fast events using an mcu.(Or at least a reference on  the web)
My problem is that the information I wish to log is received so fast
that mcu ram and eeprom is overflowed. On the other hand if I use an
external eeprom as backup I miss information while storing on it.
What's the usual mechanism applied to this kind of devices?
(Adding an external RAM mybe?)

Thank you very much.
netQ <>
"Home of amateur PIC programmers..."

Version: 2.6.2


1999\07\04@234813 by Sean Breheny

face picon face

How fast are the events you are trying to log? How do you know when the
event will occur/has occured to know to log it? How many do you need to log
(how big does your buffer need to be?)

In my design for a PIC-based DSO that I have been doing on and off for a
while now, I interfaced a PIC to a fast SRAM. In fact, the writes to the
SRAM were going on faster than the PIC could handle. The address was being
given by a fast synchronous counter IC and the PIC merely started/stopped
acquisition and read out the SRAM contents to a PC over a parallel port.

I think something like this would handle almost any high speed source of data.


At 09:03 PM 7/4/99 +0000, you wrote:
{Quote hidden}

| Sean Breheny
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