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How to convert the code in PBP "shiftout" into C?

 
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akokyaw



Joined: 11 Feb 2005
Posts: 24

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How to convert the code in PBP "shiftout" into C?
PostPosted: Wed Oct 12, 2005 9:58 am     Reply with quote
Hi everybody,
I would like to know how to convert the code in PBP as "shiftout SI,SCK,1,[%1100\4]" into C. I have read some topic about converting "shiftout" command as follow:


Code:
void ShiftOut (int8 data)
   {
     output_low(OUT_CLOCK);

     if((data&0x80)==0) 
       output_low(OUT_DO);
     else
       output_high(OUT_DO);
     data <<= 1;
     output_high(OUT_CLOCK);
     output_low(OUT_CLOCK);
   }


I want to add the variable like "OUT_CLOCK", "OUT_DO" as follow:
Code:
 void ShiftOut(int16 OUT_CLOCK, int16 OUT_DO, int8 data)


Is it possible to do this code? Any idea? or suggestion? Question

Thanks,
ako
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Wed Oct 12, 2005 11:12 am     Reply with quote
output_high and output_low take constants as a parameter. Short answer to you question, NO you can't use a parameter as a constant. You could write you own function that accepts a variable though. This has been discussed here before.

http://www.ccsinfo.com/forum/viewtopic.php?t=24315&highlight=outputhigh+variable+parameter
akokyaw



Joined: 11 Feb 2005
Posts: 24

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port variable
PostPosted: Wed Oct 12, 2005 6:40 pm     Reply with quote
Hi,
Thank for your response, Mark. I agree with you. But the following topic has been shown about port variable. I am not sure this method is indirect method or may be CCS style.

http://www.ccsinfo.com/forum/viewtopic.php?t=23837&highlight=button

Thanks,
ako
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Wed Oct 12, 2005 8:53 pm     Reply with quote
The pin numbers are CCS specific but do have some meaning. Basically the port address multiplied by 8 then the bit number added to it. If you read PCM's response in the link I posted, he shows you how to do what you want with port pins.
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