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Managing multiple digital outputs.....

 
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JAM2014



Joined: 24 Apr 2014
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Managing multiple digital outputs.....
PostPosted: Tue Nov 15, 2016 2:54 pm     Reply with quote

Hi All,

I'm looking for some suggestions on how best to code the following:

I have 8 digital outputs on an 18F24k22 device connected to pins A0 thru A5, and B4 and B5. I need to be able to turn these outputs On and Off both singly and in groups. I plan to use an int8 'OutputCode' that contains the On/Off states of all eight outputs. I can see a 'brute force' method with lots of conditional 'If' statements to translate the OutputCode variable into the individual outputs, but I imagine there is a more 'elegant' strategy.

Can someone point me in the right direction?

Thanks,

Jack
temtronic



Joined: 01 Jul 2010
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PostPosted: Tue Nov 15, 2016 3:37 pm     Reply with quote

Check the 'code library' for it ! Either PCM P to Mr. T cut code and posted it.well, pretty sure it was one of them....

Jay
gjs_rsdi



Joined: 06 Feb 2006
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PostPosted: Tue Nov 15, 2016 10:21 pm     Reply with quote

Checked the 9 pages of the library but didn't find it. I suppose I miss it somehow.
Can somebody give a more specific direction?

Best wishes
Joe
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Wed Nov 16, 2016 1:39 am     Reply with quote

Look at the send_nibble command in PCM_programmers lcd driver. In fact this can be tweaked a little by using bit test, instead of his nibble logic (it was originally posted before bit_test appeared).
gjs_rsdi



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PostPosted: Thu Nov 17, 2016 2:57 am     Reply with quote

Thanks Ttelmah
JAM2014



Joined: 24 Apr 2014
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PostPosted: Thu Nov 17, 2016 11:11 am     Reply with quote

Hi All,

For completeness, here is the method I believe that Ttelmah was referring to:

Code:

 output_bit(Out1, bit_test(iOutputCode, 0));
 output_bit(Out2, bit_test(iOutputCode, 1));
 output_bit(Out3, bit_test(iOutputCode, 2));   
 output_bit(Out4, bit_test(iOutputCode, 3));
 output_bit(Out5, bit_test(iOutputCode, 4));
 output_bit(Out6, bit_test(iOutputCode, 5));
 output_bit(Out7, bit_test(iOutputCode, 6));   
 output_bit(Out8, bit_test(iOutputCode, 7)); 


Each digital output is defined as:
Code:

#define Out1 Pin_A0            // Output #1
.
.
.
.
.
#define Out8 Pin_B5            // Output #8


I don't have boards to test this yet, but I believe this will work as intended!

Thanks to Ttelmah for pointing the way, and to PCM programmer for providing the original 'Nibble' function inside the flex_lcd driver!

Jack
gjs_rsdi



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Posts: 312
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PostPosted: Thu Nov 17, 2016 7:30 pm     Reply with quote

Thank you JAM2014
Written down like that seems simple Smile
I am in a trip, will be back at home in 10 days, will test and report back

Best wishes
Joe
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