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Discussion Groups | BasicX | Run time timer
Discussion forum for the BasicX family of microcontroller chips.
Run time timer - nuepatrick - Jul 26 9:38:05 2006
I have a project that I am designing and I need a simple accurate
timer that starts when power is applied to the circuit. I need to
display this on a bpi-216.
Any ideas would be appericated.
Thanks
Patrick
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timer that starts when power is applied to the circuit. I need to
display this on a bpi-216.
Any ideas would be appericated.
Thanks
Patrick
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Run time timer - Tom Becker - Jul 26 11:41:26 2006
Determining elapsed time from start of the current execution is
trivial, Patrick; that's the value currently in the RTC, which starts
at midnight every time you apply power. Your problem is how to store
an accumulation of that time without missing much (you don't have the
luxury of a "powering-down" interrrupt that might allow to to save the
time just before losing control) - and you must avoid burning up
EEPROM, which usually means you must distribute the accumulating value
you want to store over several or many changing EEPROM locations.
This has been discussed; search for "Persistant" and "Hobbs", and
you'll can find Atmel's PDF on the matter in the file section.
Tom
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
trivial, Patrick; that's the value currently in the RTC, which starts
at midnight every time you apply power. Your problem is how to store
an accumulation of that time without missing much (you don't have the
luxury of a "powering-down" interrrupt that might allow to to save the
time just before losing control) - and you must avoid burning up
EEPROM, which usually means you must distribute the accumulating value
you want to store over several or many changing EEPROM locations.
This has been discussed; search for "Persistant" and "Hobbs", and
you'll can find Atmel's PDF on the matter in the file section.
Tom
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Run time timer - "ese...@" - Jul 26 11:50:27 2006
Hi Patrick,
I would use a BX-24. It has the timing and RTC resources, serial interface for the LCD, and is easily programmed for this kind of task.
Best Regards, Eric
----- Original Message -----
From: nuepatrick
To: b...@yahoogroups.com
Sent: Wednesday, July 26, 2006 6:32 AM
Subject: [BasicX] Run time timer
I have a project that I am designing and I need a simple accurate
timer that starts when power is applied to the circuit. I need to
display this on a bpi-216.
Any ideas would be appericated.
Thanks
Patrick
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
I would use a BX-24. It has the timing and RTC resources, serial interface for the LCD, and is easily programmed for this kind of task.
Best Regards, Eric
----- Original Message -----
From: nuepatrick
To: b...@yahoogroups.com
Sent: Wednesday, July 26, 2006 6:32 AM
Subject: [BasicX] Run time timer
I have a project that I am designing and I need a simple accurate
timer that starts when power is applied to the circuit. I need to
display this on a bpi-216.
Any ideas would be appericated.
Thanks
Patrick
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )