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toggle ext int edge

 
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butterfly



Joined: 04 Jun 2006
Posts: 35

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toggle ext int edge
PostPosted: Mon Aug 14, 2006 2:33 am     Reply with quote
I can change ext int edge with:

ext_int_edge( H_TO_L );

or

ext_int_edge( L_TO_H);

but i need to make it toogle in a function with no preview edge knowledge..

how can make it happen?

Thank for help!!
Ttelmah
Guest
PostPosted: Mon Aug 14, 2006 2:50 am     Reply with quote
There must be some sort of 'knowledge'. Normally you could (for example), use:
Code:

if (input(PIB_B0)) {
   //signal is high, so I want to interrupt on high to low
   ext_int_edge(H_TO_L);
}
else ext_int_edge(L_TO_H);
//Otherwise interrupt on rising edge.

The decision can be based on whatever you want, but normally the state of the pin would be the most 'logical' decider.

Best Wishes
Ttelmah
Guest
PostPosted: Mon Aug 14, 2006 2:59 am     Reply with quote
Obviously, using the 'PIN', not the 'PIB'...

Best Wishes
future



Joined: 14 May 2004
Posts: 330

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PostPosted: Mon Aug 14, 2006 5:05 am     Reply with quote
You can also use this:

Code:
struct
{
   unsigned char RBIP:1;
   unsigned char INT3P:1;
   unsigned char T0IP:1;
   unsigned char INTEDG3:1;
   unsigned char INTEDG2:1;
   unsigned char INTEDG1:1;
   unsigned char INTEDG0:1;
   unsigned char RBPU:1;
}
INTCON2bits ;
#locate INTCON2bits=0x0FF1 // pic 18f452

void main( void )
{
intcon2bits.intedg1++; // toggle edge
}
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