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I wouldn't want to face THAT bad boy in competition... - Iain McLeod [more] |
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The intent of this document is to demystify in reasonable detail how digital input interrupts work with enough explanations that a programmer can confidently implement interrupt service routines and use interrupts in their robots.
The intent of this document is to demystify in reasonable detail how digital input interrupts work with enough explanations that a programmer can confidently implement interrupt service routines and use interrupts in their robots.
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Interrupts for Dummies
1076008567interrupts_for_dummies.pdf
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Discussion
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02-03-2004 17:17
jacob_dilles
Re: White Paper Discuss: Interrupts for Dummies
this is an EXCLENT white paper. thanks for taking the time to put it together!
31-12-2004 21:20
phrontist
Re: White Paper Discuss: Interrupts for Dummies
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Originally Posted by jacob_dilles
this is an EXCLENT white paper. thanks for taking the time to put it together!
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10-01-2005 00:09
prograid
Re: White Paper Discuss: Interrupts for Dummies
Do you need to disable the interrupts if you want to access the variables changed by the interrupt service routine or is disabling only necessary when the variables are changed?
Thanks
10-01-2005 09:07
Mark McLeod
Re: White Paper Discuss: Interrupts for Dummies
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Originally Posted by prograid
Do you need to disable the interrupts if you want to access the variables changed by the interrupt service routine or is disabling only necessary when the variables are changed?
Thanks |
You don't have to disable the interrupts.
Caution: If you need to reference the variable several times like:
if (encoder count == 10)
x += encoder count
The value of encoder count the second time won't necessarily be the same as the first reference. Make it a habit to move any interrupt variable to a working variable if you plan on using it repeatedly (in a calculation too).
29-01-2005 03:24
karch
Re: White Paper Discuss: Interrupts for Dummies
this is really useful, thanks! 
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