I know that I'm going to learn something here that I will never make the
same mistake on again, but I am having a major problem with code that I have
developed.  I am writing a hexidecimal value to PORTB and the value is not
always the same as what I wrote to it.  I set breakpoints immediately after
I set the value and I still see the difference so I know that something else
that I have done is not modifying it.  Originally I was using a lookup table
to get my values but to simplify and try to debug this problem I am just
writing the output to the port manually.  The values are always close to
what I have written but they are not always correct.  It also seems that
bits 2 or 3 are the bits affected.  Here is the code that I'm using (excuse
all the commented out because I am trying to simplify to isolate the
problem).

Any help on this would be greatly appreciated!

#include "o:\projects\safari\Safari.h"

/// The following are manually added definitions
#byte PORTB = 0x06
#define ALL_OUT 0x00
#define ALL_IN  0xFF

//int mirror;
//int direction; // which direction are we moving?
int angle;       // sinelookup pointer

//int sinelookup[19] =
{1,3,9,17,31,47,65,85,105,129,151,171,191,209,225,239,247,253,255};

#int_rtcc
rtcc_isr() {

switch (angle){

Case 0:
// mirror = sinelookup[angle];
 PORTB = 0x00;
 angle++;
// if (angle++ >= 17){
//    direction = 2;
// }
break;

Case 1:
 PORTB = 0x2D;
 angle++;
break;

Case 2:
 PORTB = 0x57;
 angle++;
break;

Case 3:
 PORTB = 0x7F;
 angle++;
break;

Case 4:
 PORTB = 0xA3;
 angle++;
break;

Case 5:
 PORTB = 0xC3;
 angle++;
break;

Case 6:
 PORTB = 0xDD;
 angle++;
break;

Case 7:
 PORTB = 0xEF;
 angle++;
break;

Case 8:
 PORTB = 0xFB;
 angle++;
break;

Case 9:
 PORTB = 0xFF;
 angle=0;
break;
}

output_low(PIN_B0);
delay_us(10);
output_high(PIN_B0);

return;
}

#int_adcc
adc_isr() {

}

#int_eeprom
eeprom_isr() {

}

#int_timer1
timer1_isr() {

}

#int_timer2
timer2_isr() {
}

void main() {

   setup_adc_ports(A_ANALOG);
   setup_adc(ADC_CLOCK_DIV_2);
   setup_spi(FALSE);
   setup_psp(PSP_DISABLED);
   setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
   setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
   setup_timer_2(T2_DIV_BY_16,1,1);
   setup_ccp1(CCP_OFF);
   setup_ccp2(CCP_OFF);
   enable_interrupts(INT_RTCC);
//   enable_interrupts(INT_ADC);
//   enable_interrupts(INT_EEPROM);
//   enable_interrupts(INT_TIMER1);
//   enable_interrupts(INT_TIMER2);
   enable_interrupts(global);

   set_tris_b(ALL_OUT);    // Set all pins on PORTB as Outputs
   PORTB = 0x00;           // Set all pins on PORTB Low

   angle = 0;              // Initialize angle pointer
// direction = 1;          // and direction.

    do {

    } while(TRUE);

}

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
"[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's