RTCC ???

[Flavio58]

To create a system clock to memorize the date/time I used a method as this used in computer bios system.
Into a setup variable I saved the second's number from a known date ... after I add the rtcc seconds.
I've compiled a software starting from CCS example :

#if defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12

#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
#endif

#define INTS_PER_SECOND (32000/(4*256*256))

byte seconds; // A running seconds counter
byte int_count; // Number of interrupts left before a second has elapsed


#int_rtcc // This function is called every time
void clock_isr() { // the RTCC (timer0) overflows (255->0).
// For this program this is apx 76 times
if(--int_count==0) { // per second.
++seconds;
int_count=INTS_PER_SECOND;
}
}

void main(void)
{
byte start;
long int i;
int_count=INTS_PER_SECOND;
set_rtcc(0);
setup_counters( RTCC_INTERNAL, RTCC_DIV_256 | RTCC_8_BIT);
enable_interrupts(INT_RTCC);
do {
start=seconds;
for(i=0;i!=500;i++)
i += 2;
start = seconds-start;
} while (TRUE);
}

There is a big problem ....
When I compile it and I run on ICD 2 the software is OK but the second's number don't change (seconds it's always 0).
Why the interrupt don't run correctly with this source ?

Thank you.....
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515949

[Douglas Kennedy]

:=To create a system clock to memorize the date/time I used a method as this used in computer bios system.
:=Into a setup variable I saved the second's number from a known date ... after I add the rtcc seconds.
:=I've compiled a software starting from CCS example :
:=
:=#if defined(__PCM__)
:=#include <16F877.h>
:=#fuses HS,NOWDT,NOPROTECT,NOLVP
:=#use delay(clock=20000000)
:=#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
:=
:=#elif defined(__PCH__)
:=#include <18F452.h>
:=#fuses HS,NOPROTECT,NOLVP
:=#use delay(clock=20000000)
:=#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
:=#endif
:=
:=#define INTS_PER_SECOND (32000/(4*256*256))
:=
:=byte seconds; // A running seconds counter
:=byte int_count; // Number of interrupts left before a second has elapsed
:=
:=
:=#int_rtcc // This function is called every time
:=void clock_isr() { // the RTCC (timer0) overflows (255->0).
:= // For this program this is apx 76 times
:= if(--int_count==0) { // per second.
:= ++seconds;
:= int_count=INTS_PER_SECOND;
:= }
:=}
:=
:=void main(void)
:={
:= byte start;
:= long int i;
:= int_count=INTS_PER_SECOND;
:= set_rtcc(0);
:= setup_counters( RTCC_INTERNAL, RTCC_DIV_256 | RTCC_8_BIT);
:= enable_interrupts(INT_RTCC);
:= do {
:= start=seconds;
:= for(i=0;i!=500;i++)
:= i += 2;
:= start = seconds-start;
:= } while (TRUE);
:=}
:=
:=There is a big problem ....
:=When I compile it and I run on ICD 2 the software is OK but the second's number don't change (seconds it's always 0).
:=Why the interrupt don't run correctly with this source ?
:=
:=Thank you.....
Read the manual under enable_interrupts (GLOBAL)
___________________________
This message was ported from CCS's old forum
Original Post ID: 144515950