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FAST_IO help

 
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Userrr



Joined: 09 Jul 2004
Posts: 40
Location: Europe

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FAST_IO help
PostPosted: Thu Aug 05, 2004 12:37 pm     Reply with quote
This source: 10MHZ, 877

#use fast_io(d)
...
set_tris_d(0)
...
while(1)
{
i++;
output_d(i);
}

Please tell why this function 'out_put_d(i) ' called so slowly.
As I think it must be 1 function - 400ns, but I don't see that.
Mark



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

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PostPosted: Thu Aug 05, 2004 1:00 pm     Reply with quote
Code:

.................... void main() 
.................... {   
0004:  CLRF   FF8
0006:  BCF    FD0.7
0008:  CLRF   FEA
000A:  CLRF   FE9
000C:  BSF    FC1.0
000E:  BSF    FC1.1
0010:  BSF    FC1.2
0012:  BCF    FC1.3
....................   int i; 
....................   while(1)   
....................   {   
....................     i++;   
0014:  INCF   06,F
....................     output_d(i);   
0016:  MOVFF  06,F8C
....................   }   
001A:  BRA    0014
.................... }   
....................   
.................... 
001C:  SLEEP


INCF is 1 cycle
MOVFF is 2 or 3 cycles
BRA is 2 cycles

For a total of 5 cycles which is 2us or 2000ns
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