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using delay_ms()

 
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beaker404



Joined: 24 Jul 2012
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using delay_ms()
PostPosted: Mon Mar 12, 2018 2:45 pm     Reply with quote

Got a simple application where I am doing nothing but monitoring a signal and then sending the calculated frequency via serial. My frequency range is between 1 and 2 hz so very slow relatively speaking.

My question is the event I am watching has some ring to it so to keep from picking up multiple events per event, I merely use a delay_ms(400) to add some time to allow the signal to stabilize. My question is do interrupts like RTCC continue to work while a long delay_ms() call is made? should I break that into say a 10 ms delay and a for loop to get the time?

Comments on this topic welcome.

16F876 running 4mhz mplab 8.91 CCS version 5.064
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Mon Mar 12, 2018 3:18 pm     Reply with quote

Interrupts are serviced.

If you look in the manual:
Quote:

The delay time may be longer than requested if an interrupt is serviced during the delay. The time spent in the ISR does not count toward the delay time.


So if your interrupts use a lot of time, you may end up taking longer than 400mSec.
beaker404



Joined: 24 Jul 2012
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PostPosted: Mon Mar 12, 2018 3:22 pm     Reply with quote

Thanks, my interrupt is very small, only index a variable and return is all. So I should be ok.
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