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

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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.
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netQ <spam_OUTnetquakeTakeThisOuTspaminnocent.com>
http://virtuaweb.com/picprog
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1999\07\04@234813 by Sean Breheny

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Hi,

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.

Sean

At 09:03 PM 7/4/99 +0000, you wrote:
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| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
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