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How to declare variable like this

 
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Somkiat



Joined: 30 Mar 2004
Posts: 8

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How to declare variable like this
PostPosted: Tue Jul 20, 2004 1:33 am     Reply with quote

I have array

BYTE Dout[4];


I want to declare bit 5 in Dout[2] is VP for use like this

VP=1;
or
VP=0;

How can I declare VP ?

Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Jul 20, 2004 2:56 am     Reply with quote

If you don't want to use a union and bitfields, then you
can use the method shown below. Compile this program
and look at the assembly listing (.LST file) to see that it works.

Code:
#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)

BYTE Dout[4]; 
#byte Dout2 = Dout + 2   
#bit VP = Dout2.5

//====================================
void main()
{

VP = 1;

while(1);
}
rnielsen



Joined: 23 Sep 2003
Posts: 852
Location: Utah

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PostPosted: Tue Jul 20, 2004 8:34 am     Reply with quote

Would this also work?

bit_set(Dout[2], 5);// sets bit 5 of Dout[2]

or

bit_clear(Dout[2], 5);// clears bit 5 of Dout[2]

Ronald
Neutone



Joined: 08 Sep 2003
Posts: 839
Location: Houston

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PostPosted: Tue Jul 20, 2004 8:46 am     Reply with quote

I'm sure that works but it does not read as well as this;

VP=1;
or
VP=0;
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