Maskinnära programmering 6B2266

* rbint62x.c RB-int reads rotary switch */
#include "16F628.h"
#include "int16Cxx.h"
#pragma config |= 0x3ff0
int counter; /* global pulsecounter */
char trans; /* global for transitions */
#pragma bit lightdiode @ PORTA.2
#pragma bit quad_A @ PORTB.6
#pragma bit quad_B @ PORTB.7
#define ON 1
#define OFF 0
#pragma origin 4
interrupt int_server( void )
{
int_save_registers
if( RBIF == 1 ) /* is it the RB pin change-interrupt? */
{ /* this time it's obvius that it is! */
/* read encoder new value */
trans.0 = quad_A;
trans.1 = quad_B;
/* compare with old value */
if( trans == 0b00.01 ) counter ++;
if( trans == 0b01.00 ) counter --;
/* replace old value with new value */
trans.2 = trans.0;
trans.3 = trans.1;
RBIF = 0; /* Reset RB-change flag before leaving */
}
int_restore_registers
}
void main( void )
{
/* the main program */
CM0=1; CM1=1; CM2=1; /* no comparators on PORTA */
OPTION.7 = 0; /* internal pullup resistors on */
TRISA.2 = 0; /* PA2 is output to lightdiode */
PORTA.2 = 0;
TRISB = 0b11000000; /* only inputs quad_A and quad_B */
trans = 0;
counter = 0;
RBIE = 1; /* local enable */
GIE = 1; /* global enable */
}
while( 1 )
{
if ( counter == 0 ) lightdiode = ON;
else lightdiode = OFF;
}
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