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Latch register for i/o ports

 
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Jeff



Joined: 06 Jul 2006
Posts: 1
Location: UK

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Latch register for i/o ports
PostPosted: Sat Sep 27, 2008 11:25 am     Reply with quote
Am using PCWH 4.079.
Target is PIC18F252.
Is it possible to read the i/o port latch registers, rather than the pins themselves, using C syntax?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Sep 27, 2008 11:59 am     Reply with quote
There is no CCS function to read the latch registers. But you can use
a #byte statement to declare the register addresses, and then read
them directly, in code. Example:
Code:
#include <18F452.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)

#byte LATA = 0xF89
#byte LATB = 0xF8A
#byte LATC = 0xF8B
#byte LATD = 0xF8C
#byte LATE = 0xF8D

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

value = LATC;  // Read the latch register for Port C

while(1);
}



The register addresses come from this section of the PIC data sheet:
Quote:
TABLE 4-1: SPECIAL FUNCTION REGISTER MAP
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