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how to control by bit!

 
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takumi



Joined: 07 Mar 2009
Posts: 14

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how to control by bit!
PostPosted: Wed Jan 06, 2010 7:27 pm     Reply with quote
Hi all, I need some help to understand about controlling output ports by
bit. The code is as follows (PIC16F877A):
Code:

#define sensor1 PIN_D0
#define sensor2 PIN_D1
#define motor1 PIN_B0
#define motor2 PIN_B1

void main(){

     while (1){
          if(input(sensor1)==1 && input(sensor2)==1){
                  output_b(0b00000011);
          }
         
          else if(input(sensor1)==0 && input(sensor2)==1){
          output_b(0b00000001);
          }

          else if(input(sensor1)==1 && input(sensor2)==0){
          output_b(0b00000010);
          }

          else {
          output_b(0b00000000);
          }
    }
}

The question is instead of using
Code:
output_b(0b00000011);

can I do this:
Code:
 output_b(0b000000|motor1|motor2);
mickey231bhq



Joined: 06 Apr 2005
Posts: 19
Location: Formosa

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PostPosted: Wed Jan 06, 2010 7:35 pm     Reply with quote
you can use "output_high" and "output_low".
SherpaDoug



Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA

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PostPosted: Wed Jan 06, 2010 8:21 pm     Reply with quote
Try this:
Code:

#define mot1mask 0b00000001
#define mot2mask 0b00000010
-
-
-

Then you can turn the motors on and off with this:
Code:

output_b(mot1mask|mot2mask);  //both motors on
output_b(~mot1mask&~mot2mask);  //both motors off
output_b(mot1mask&~mot2mask|mot3mask&~mot4mask);  //motors 1&3 on, 2&4 off

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