Subject:
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Re: Time available during 1 kHz system interrupt?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 2 Nov 1999 01:48:19 GMT
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Original-From:
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Christopher Prosser <cprosser@acm.%AntiSpam%org>
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Viewed:
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992 times
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Hi Greg,
It all depends. Various features of the HB can be turned on and off to
change the amount of work done in the main ISR. By default the code uses
300ms to execute. The file lib_hb.c provides the following:
/********************************/
/*** System Interrupt Control ***/
/********************************/
/*
These functions allow you to turn on and off various features
controlled by the system interrupt routines. The more features
you turn off, the faster your code will run.
On reset, the features have the following state:
pulse width modulation ON
infrared decoding ON
LCD printing ON
quad shaft decoding OFF
IR tranmission OFF
This uses approx. 30% of total CPU time.
Approximate benchmarks:
x Feature % of CPU
------- --------
PWM 3
IR decode 11
LCD printing (active) 8
LCD printing (inactive) 1
quad shaft decode 5
IR transmission 1
*/
-chris prosser
----- Original Message -----
From: Greg Starr <starr@unm.edu>
To: <handyboard@media.mit.edu>
Sent: Monday, November 01, 1999 7:19 AM
Subject: Time available during 1 kHz system interrupt?
> Does anyone know the approximate amount of time available for user
> assembler programs which "add on" to the existing 1 kHz HB interrupt?
>
> Another way of stating that is...how much time is used by the 1kHz HB ISR • code?
>
> --greg
>
> *****************************************************************
> * Greg Starr, Professor *
> * Department of Mechanical Engineering ph (505) 277-6298 *
> * University of New Mexico, Albuquerque NM 87131 FAX 277-1571 *
> * email- starr@unm.edu WWW- http://www.me.unm.edu/~starr/ *
> *****************************************************************
>
>
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Message is in Reply To:
 | | Time available during 1 kHz system interrupt?
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| Does anyone know the approximate amount of time available for user assembler programs which "add on" to the existing 1 kHz HB interrupt? Another way of stating that is...how much time is used by the 1kHz HB ISR code? --greg ***...*** * Greg Starr, (...) (25 years ago, 1-Nov-99, to lugnet.robotics.handyboard)
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