Interrupt nesting in PIC18F4520

[hez_91]

Hi

I am experiencing some difficulties in trying to get the TIMER1 to run in my interrupt routine.
In my interrupt routine, it has a password input module that waits for the input of the password in a for loop. During that time, I am suppose to set a time-limit for the input before sending off an alarm but timer1 interrupts are not active during my external interrupt routine. Is there anyway around this or am i doing anything wrong?

#include <p18f4520.h>		
#include <delays.h>
#include <stdio.h>
#include <string.h>
#include <usart.h>
#include <stdlib.h>

void checkInputs(void);	
void sendSMS(void);
void passwordPrompt(void);
//void receive_sms(void);

int pb, dip_sw, x, check, count, count2, systemArmed, y;
void high_isr(void);		// prototype of function high_isr

	
#pragma code high_vector = 0x08

void high_vector(void) 
{
   _asm    goto  high_isr  _endasm 	//jump to interrupt routine
}

#pragma code			//return to default code section

#pragma interrupt high_isr
void high_isr(void)
{
	if(INTCONbits.INT0IF) //Arm button
	{
	systemArmed = 2;
	Delay10KTCYx(200);
	}

  	if(INTCON3bits.INT2IF){ // Sound detected
	
	if(systemArmed==2)
	{
	
	Delay10KTCYx(200);
		if(PORTBbits.RB2 = !PORTBbits.RB2) // Glass break sensor triggered
		{
			T0CONbits.TMR0ON = 0;
			INTCONbits.TMR0IF = 0;
			INTCONbits.TMR0IE = 0;
			PORTBbits.RB5 = ~PORTBbits.RB5;
			passwordPrompt();
			T0CONbits.TMR0ON = 1;
			INTCONbits.TMR0IE = 1;
		//	sendSMS();
	
		}	

			INTCON3bits.INT2IF = 0;	
	}

 	}
	


	if (INTCONbits.TMR0IF) {				// Check for Timer0 overflow

	TMR0H = 0x0B;					// Clear Timer0 high byte register 
	TMR0L = 0xDC;					// Clear Timer0 low byte register

	if(systemArmed==2)
	{ 		
	count++;

	if(count==10) //After 10 seconds, read as idle and go into sleep mode
	{	
	PORTBbits.RB3 = ~PORTBbits.RB3;
	PORTBbits.RB5 = ~PORTBbits.RB5;
	count = 0;
	T0CONbits.TMR0ON = 0;	
//	Sleep();
	}			
	}

	INTCONbits.TMR0IF = 0;				// Clear Timer0 interrupt flag
	}

	if (PIR1bits.TMR1IF)
	{
	TMR1H = 0x0B;					// Clear Timer0 high byte register 
	TMR1L = 0xDC;					// Clear Timer0 low byte register
	count2++;
	if(y==1)
	{
	if(count2==10)
	{	
	count2=0;
	sendSMS();
//	
//		T1CONbits.TMR1ON = 0;
	}
		
	}
	PIR1bits.TMR1IF = 0;	
	} 	

}



void main()
{
count = 0;
count2 = 0;
systemArmed = 0;


TRISA = 0b11111111;
TRISB = 0b11010111;		
TRISC = 0b10111111;
TRISD = 0xff;


PORTA = 0x00;
PORTB = 0x00;
PORTD = 0;

SPBRG = 25;
TXSTA = 0b00100100;
RCSTA = 0b10010000;


RCONbits.IPEN = 0;

//INTCON2bits.INT2IP	= 1;            // IP2 high priority
INTCONbits.INT0IF	= 0;            // clear IF first
INTCONbits.INT0IE	= 1;            // Enable INT2

INTCON3bits.INT2IP	= 0;            // IP2 high priority
INTCON3bits.INT2IF	= 0;            // clear IF first
INTCON3bits.INT2IE	= 1;            // Enable INT2

INTCON2bits.INTEDG2 = 0; 



INTCON2bits.TMR0IP = 1;				// Set Timer0 interrupt to low priority
INTCONbits.TMR0IF = 0;				// clear IF first
INTCONbits.TMR0IE = 1;				// Enable Timer0 overflow interrupt

TMR0H = 0x0B;						// Clear Timer0 high byte register 
TMR0L = 0xDC;						// Clear Timer0 low byte register
T0CON = 0b10000011;					// On Timer0, set to 16-bit mode,
									// Use internal instruction clock,
									// Rising-edge trigger, set prescaler to 1:8

IPR1bits.TMR1IP = 1;
PIR1bits.TMR1IF = 0;
PIE1bits.TMR1IE = 1;

TMR1H = 0x0B;
TMR1L = 0xDC;
T1CON = 0b00110001;

INTCONbits.GIEL =1;
INTCONbits.GIE = 1;


Sleep();
PORTBbits.RB3 = 1;





}


void passwordPrompt()
{

count = 0; // reset time into idle status
count2 = 0;
y = 1;

for(x=0;x<10;x++) // loop
		{
dip_sw = PORTD & 0x0f; // read dip switches
Delay10KTCYx(150);
pb = PORTD & 0xf0; // read push buttons
pb >>=4; // shift the upper nibble to the lower nibble

	if(pb == dip_sw) //compare dip with push buttons
	{
		x = 0; // reset number of tries
		PORTBbits.RB5 = 1; // Light up RED LED
		Delay10KTCYx(100); 
		PORTBbits.RB5 = 0; // Off RED LED
		systemArmed = 0;
		break;
	}
	else if (pb != 0x0f)
	{
		PORTBbits.RB3 = 1; // Light up GREEN LED
		Delay10KTCYx(100);
		PORTBbits.RB3 = 0; // Off GREEN LED
		x++;		
	}		
			
			if(x==3) // number of tries allowed 
			{
	//			alarm(); //sound alarm
				PORTBbits.RB5 = 1; // Light up red LED
				sendSMS();
				break;
		//		PORTBbits.RB4 = 1; // Start recording
			}

			x--;		
		}	
}

 

[millwood]

timer1 interrupts are not active during my external interrupt routine.

the datasheet covered that quite extensively and clearly.

Is there anyway around this or am i doing anything wrong?

interrupts are supposed to be short and sweet. so keep them that way, as suggested by the datasheet.