PIC18F452 / 458 Global Interrupt

[Eric Girard]

I'm using PCH V3.126. I need to generate an interrupt from the RTCC.

unsigned char Update = 1;

byte INTCON = 0x0FF2; //Give us access to intcon register
#int_rtcc
void RTCC_ISR
{ Update = 1; }

void main
{
....
setup_timer_0(RTCC_INTERNAL | RTCC_DIV_BY_16);
enable_interrupts(INT_RTCC);
enable_interrupts(GLOBAL);

while (1)
{
INTCON |= 0xC0; //<-If I force GIE set, its working
if (Update)
{
Update = 0;
... do something
}
}
}

This code is not working and should be working. I've looked at the code generated and it SHOULD be working but for some unknown reasons, GIE bit get cleared. If I set GIE at the beginning of the loop its ok but this is not a useable solution.

I know there are somes funny things about the 18F series interrupts. I would appreciate any help

Eric Girard
___________________________
This message was ported from CCS's old forum
Original Post ID: 13443

[Mirko]

I test youre program, and for me is OK. I used ( PIC 18F458 an PCWH 3.13)
When I download this firmware the microcontroller print "...HI..." every 1 second +/-.

Hi Mirko

********************************************************
#include <18F458.h>
#use delay(clock=4000000)
#fuses XT,NOWDT,WDT1
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)


int Update=0;

#int_RTCC
RTCC_isr() {
Update=1;
}



void main() {

setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_CLOCK_DIV_2);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL | RTCC_DIV_16);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
setup_comparator(FALSE);

enable_interrupts(INT_RTCC);
enable_interrupts(global);

while (1) {
if (Update) {
update=0;
printf("...HI...");
}
}
}

********************************************************



:=I'm using PCH V3.126. I need to generate an interrupt from the RTCC.
:=
:=unsigned char Update = 1;
:=
:=byte INTCON = 0x0FF2; //Give us access to intcon register
:=#int_rtcc
:=void RTCC_ISR
:={ Update = 1; }
:=
:=void main
:={
:= ....
:= setup_timer_0(RTCC_INTERNAL | RTCC_DIV_BY_16);
:= enable_interrupts(INT_RTCC);
:= enable_interrupts(GLOBAL);
:=
:= while (1)
:= {
:= INTCON |= 0xC0; //<-If I force GIE set, its working
:= if (Update)
:= {
:= Update = 0;
:= ... do something
:= }
:= }
:=}
:=
:=This code is not working and should be working. I've looked at the code generated and it SHOULD be working but for some unknown reasons, GIE bit get cleared. If I set GIE at the beginning of the loop its ok but this is not a useable solution.
:=
:=I know there are somes funny things about the 18F series interrupts. I would appreciate any help
:=
:=Eric Girard
___________________________
This message was ported from CCS's old forum
Original Post ID: 13461