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question about binary code and variables

 
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roby
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question about binary code and variables
PostPosted: Wed Mar 01, 2006 2:06 pm     Reply with quote
I need to read one bit from 3 pins A1 A2 A3. For example A1=1 A2=2 A3=3 then I need to see them as one binary number that is to say I need to put them side by side to create the number 101 and I it becomes a number to convert in decimal or to use.

how can I do?

Thanks from Italy
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Wed Mar 01, 2006 2:35 pm     Reply with quote
Do you mean something like this?
Code:
int8 InputValue;
InputValue = input_a() & 0b00001110;  // Only get state of pins A1, A2, A3
InputValue = InputValue >> 1;         // A0 is not used, so shift value 1 bit to the right
printf("InputValue = %d\n", InputValue);
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Wed Mar 01, 2006 4:24 pm     Reply with quote
If what you want it is a binary representaci�n of the type '101':

Code:

int n = 3;

 InputValue = input_a() & 0b00001110; 
 
 printf("Binary =  ");
 
 do
   {
    if(bit_test(InputValue,3))
      {putc('1'); }
    else
      {putc('0'); }

    rotate_left(&InputValue,1);
   }while(--n);
 



Humberto
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