External Interrupt check

[divivoma]

Hello All,

I'm trying to use the EXT INT1 and EXT_INT2 of PIC24FJ256GB110.
I'm using PPS in order to map these 2 interrupt to pin RD11 (RDP12) and RD10 (RP3).

I've followed the datasheet instruction by setting them as input in TRISD and then calling the proper ISR on a simple button press (rising edge), but it's not working..

Below the code...any errors?
Thank you for the advices.

Code: Select all

 void EXT_INT1() iv IVT_ADDR_INT1INTERRUPT ics ICS_AUTO 
{
	switch_1 = 1;
	IFS1.INT1IF =0;			//Clear INT1	
}

void EXT_INT2() iv IVT_ADDR_INT2INTERRUPT ics ICS_AUTO 
{

switch_2 = 1;
IFS1.INT2IF =0;			//Clear INT2

} 

void main()
 {

    LATD = 0x00;
    TRISD = 0x0C00;  //RD11 , RD10 AS EXTERNAL INTERRUPT INPUT

Unlock_IOLOCK();

PPS_Mapping(12, _INPUT, _INT1);   //pin 71 is PORTD.RD11 that has RP12--> assign ext INT 1 
PPS_Mapping(3, _INPUT, _INT2);   // pin 70 is PORTD.RD10 that has RP3--> assign ext INT 2
		
 Lock_IOLOCK();
	//1- Nested interrupt enabled
        INTCON1.NSTDIS = 0;   

	INTCON2.INT1EP 	= 0; 	//rising edge		
	INTCON2.INT2EP 	= 0;	//rising edge 
		
        INTCON2.ALTIVT 	= 0;	//Disabled Alternate interrupt vector table
	INTCON2.DISI 		= 0;	//DISI function enabled to count the right amount of cycle with interrupt disabled
		
	IPC5 = 0x0006;	//priorita int 1 e 2
	IPC7 = 0x0060;

 	IFS1.INT1IF =0;			//Clear INT1
	IFS1.INT1IE =1;			//Enable external interrupt INT1 
	
	IFS1.INT2IF =0;			//Clear INT2
	IFS1.INT2IE =1;			//Enable external  interrupt INT2
	
  while(1)
   {
     
			
		 if(switch_1)
		 {
								
				LED_ROSSO = 1;
				Delay_ms(500);
				LED_ROSSO = 0;
				switch_1 = 0;				 
		 }
		 if(switch_2)
		 {
				LED_VERDE = 1;
				Delay_ms(500);
				LED_VERDE = 0;
				switch_2 = 0; 	 
		 }
  
    
  }

[divivoma]

Hello all,
I've found the first error here and it was the wrong register used:

IEC1.INT1IE =1; //Enable external interrupt INT1
IEC1.INT2IE =1; //Enable external interrupt INT2

Instead of IFS1.INT1IE =1;

With this modification I'm able to trigger only the INT1 but not the INT2.

I think the problem is to the I/O pin configuration.
If I invert the PPS by changing:

PPS_Mapping(12, _INPUT, _INT1); --> with --> PPS_Mapping(12, _INPUT, _INT2); --> always on RD11

I'm always getting the _INT2 working but not the other interrupt on RD10.
So both the interrupt are configurated properly (I guess..) but I have some issue on the edge recognition on RD10..

Any help please?
Thank you.

Marco

[divivoma]

PROBLEM SOLVED:

By manually setting the RPn :

Code: Select all

Unlock_IOLOCK();
RPINR0bits.INT1R = 12;
RPINR1bits.INT2R = 3;
Lock_IOLOCK();

Calling the PPS function in the way listed above is not working..
Maybe there is some special way to call the PPS function properly?

Thank you,

Marco