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setting up adc ports but using some as digital pins

 
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wirelessage



Joined: 08 Aug 2012
Posts: 34

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setting up adc ports but using some as digital pins
PostPosted: Wed Aug 08, 2012 1:31 pm     Reply with quote

Hi all:

I had a question regarding setup_adc_ports() functionality for PIC 18F2685.

I need to ONLY have AN0 to AN4, AN10 as analog inputs. However, I see from the header file and from the PIC datasheet (18f2685) that I can only use a few combinations (AN0 to AN3; AN0 to AN4; AN0 to AN10 etc).

So, seems like the only option I have is to:
a) Configure all pins (AN0 to AN10) as analog input.
b) Re-configure AN8, AN9 as digital pins and use them and/or re-configure the pins back to analog once the firmware is done using them as digital pins.

Does anyone know of any issues doing this?

Regards
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Aug 08, 2012 1:48 pm     Reply with quote

Read these posts by Ttelmah on the topic:
http://www.ccsinfo.com/forum/viewtopic.php?t=38205
http://www.ccsinfo.com/forum/viewtopic.php?t=44392
http://www.ccsinfo.com/forum/viewtopic.php?t=44090&start=5
http://www.ccsinfo.com/forum/viewtopic.php?t=42954
wirelessage



Joined: 08 Aug 2012
Posts: 34

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PostPosted: Wed Aug 08, 2012 2:15 pm     Reply with quote

Thanks for the prompt response! These older forum references contain good info.

Regards
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