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[SOLVED] Problem triggering interrupts for Motion Feedback-Input capture mode module in PIC18F

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Hi,

I Am trying (for now just using the MPLABX simulator) to trigger an interrupt each time any of the associated PINs (CAP1,2 & 3) changes state.

If I configure the MCU this way:

Code: 
TRISAbits.TRISA2 = 1;
    TRISAbits.TRISA3 = 1;
    TRISAbits.TRISA4 = 1;
    
    T5CONbits.TMR5ON = 1; 
    

    CAP1CONbits.CAP1M0 = 0; 
    CAP1CONbits.CAP1M1 = 0;
    CAP1CONbits.CAP1M2 = 0;
    CAP1CONbits.CAP1M3 = 1;

    CAP2CONbits.CAP2M0 = 0; 
    CAP2CONbits.CAP2M1 = 0;
    CAP2CONbits.CAP2M2 = 0;
    CAP2CONbits.CAP2M3 = 1;

    CAP3CONbits.CAP3M0 = 0; 
    CAP3CONbits.CAP3M1 = 0;
    CAP3CONbits.CAP3M2 = 0;
    CAP3CONbits.CAP3M3 = 1; 
 
    
    PIR3bits.IC1IF = 0;
    PIR3bits.IC2QEIF = 0;
    PIR3bits.IC3DRIF = 0;
    
    PIE3bits.IC1IE = 1;
    PIE3bits.IC2QEIE = 1;
    PIE3bits.IC3DRIE = 1; 

    INTCONbits.PEIE = 1; 
    
    INTCONbits.GIE = 1;

The ISR is this one:

Code: 
void interrupt isr(void)
{
   
    step();
    
    if (contador == 5)
    {
        contador = 0;
    }
    else
    {
        contador++;
    }
    
    PIR3bits.IC1IF = 0;
    PIR3bits.IC2QEIF = 0;
    PIR3bits.IC3DRIF = 0;
    
}

And then force a PIN change using the stimulus on any of the CAPx pins, I observe that the corresponding PIR3 bit is set, but the ISR is never triggered. I tried with a watchpoint and it is evident too due to the fact that, each time the ISR is triggered the variable "contador" is incremented, something that never happens...

I tried to play changing the order in which each flag is activated with no success. Is anything I am missing?
 

Try the fonction case instade of the fonction if
 

emko123456789 said:
Try the fonction case instade of the fonction if
Click to expand...


You mean inside the ISR?. It doesn´t even reach it, it is never executed so I don´t see how that would solve anything...
 

1. Which PIC18F are you using ?
2. Does the Pins you have used for External Interrupt sensing has ADC and Or Comparator functions ?
3. If yes, Have you disabled them ?
 

Okada said:
1. Which PIC18F are you using ?
2. Does the Pins you have used for External Interrupt sensing has ADC and Or Comparator functions ?
3. If yes, Have you disabled them ?
Click to expand...

The MCU is the pic18f4431.

When I originaly posted I forgot to set the Pins to Digital (they were in their default status, as Analog). But I recently solved that with no effect. ISR is still not triggered. The code is now like this:

Code: 
 TRISAbits.TRISA2 = 1;
    TRISAbits.TRISA3 = 1;
    TRISAbits.TRISA4 = 1;
    ANSEL0bits.ANS2 = 0;
    ANSEL0bits.ANS3 = 0;
    ANSEL0bits.ANS4 = 0;
    
 
    T5CONbits.TMR5ON = 1;       
    
   
    CAP1CONbits.CAP1M0 = 0; 
    CAP1CONbits.CAP1M1 = 0;
    CAP1CONbits.CAP1M2 = 0;
    CAP1CONbits.CAP1M3 = 1;
    CAP2CONbits.CAP2M0 = 0; 
    CAP2CONbits.CAP2M1 = 0;
    CAP2CONbits.CAP2M2 = 0;
    CAP2CONbits.CAP2M3 = 1;
    CAP3CONbits.CAP3M0 = 0; 
    CAP3CONbits.CAP3M1 = 0;
    CAP3CONbits.CAP3M2 = 0;
    CAP3CONbits.CAP3M3 = 1; 
    
    PIR3bits.IC1IF = 0;
    PIR3bits.IC2QEIF = 0;
    PIR3bits.IC3DRIF = 0;
    

    PIE3bits.IC1IE = 1;
    PIE3bits.IC2QEIE = 1;
    PIE3bits.IC3DRIE = 1;      


    INTCONbits.PEIE = 1;     
    

    INTCONbits.GIE = 1;
 

Have you enabled pullups on those Capture pins ? Or do you have pullup resistors on those input pins ?
 
Okada said:
Have you enabled pullups on those Capture pins ? Or do you have pullup resistors on those input pins ?
Click to expand...

There is no circuit, I am using the MPLABX simulator. I think there are no internal pullups in PORTA, which is the one linked to the Motion Feedback module
 

It is apparently a limitation of the MPLABX simulator and the PIC18F series. It does not support the Motion Feedback module. Tested in a real circuit and it works.
 

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