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input_?()

 
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input_?()
PostPosted: Wed Jul 12, 2006 7:08 pm     Reply with quote
Hi,

Is posible to read 8 pins of different ports simultaneously?
for example, I know that using input_b() I can read 8 bits of portb, but is it posible pre-configure any of them ? may be using any #USE_?? or something in order to make a "virtual port" using pins from diferent ports ?.

Thank you.
asmallri



Joined: 12 Aug 2004
Posts: 1635
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PostPosted: Wed Jul 12, 2006 7:58 pm     Reply with quote
If you mean simultaneously as in one instruction. No. The underlying PIC does not support virtualization so there is no way the compiler can do it.
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PostPosted: Wed Jul 12, 2006 8:30 pm     Reply with quote
Something like this would be about the best you can do.
Code:

#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

// Port addresses for 16F877.
#byte PortA = 5
#byte PortB = 6
#byte PortC = 7
#byte PortD = 8
#byte PortE = 9


// Read various pins on different ports,
// pack them into a byte, and return it.
int8 read_pins(void)
{
int8 retval;
#bit b0 = retval.0
#bit b1 = retval.1
#bit b2 = retval.2
#bit b3 = retval.3
#bit b4 = retval.4
#bit b5 = retval.5
#bit b6 = retval.6
#bit b7 = retval.7
   
b0 = bit_test(PortA, 0);
b1 = bit_test(PortA, 2);
b2 = bit_test(PortB, 1);
b3 = bit_test(PortB, 4);
b4 = bit_test(PortB, 5);
b5 = bit_test(PortC, 0);
b6 = bit_test(PortC, 1);
b7 = bit_test(PortC, 2);
   
return(retval);   
}   

//========================
void main()
{
int8 value;

value = read_pins();

while(1);
}
Guest
PostPosted: Fri Jul 14, 2006 11:42 am     Reply with quote
Ok, thank you. I'll try with that.
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