PIC32, XC32, timer interrupt vector not entered

Question

I have the below timer 5 interrupt vector that is not entered, even when both the corresponding Interrupt enable bit for timer 5 is set, and the corresponding interrupt flag for timer 5 is set.

Here is my interrupt vector handler:

void __ISR(_TIMER_5_VECTOR,IPL4SOFT) _T5Interrupt(void) { PORTDbits.RD2 = 1; // << -- LED will light when here. T4CONbits.ON = 0; TMR4 = 0; TMR5 = 0; Global_TimeOut = 1; IFS0bits.T5IF = 0; }

My global interrupts are set to accept multi-vector interrupts and is initialized as follows:

void Init_Global_Interrupts(void) { // Initializing Global Interrupts //INTCON // 16 Single Vector is not presented with a shadow register set INTCONbits.SS0 = 0; // 12 Interrupt Controller configured for multi vectored mode INTCONbits.MVEC = 1; // 10 - 8 Disables interrupt proximity timer INTCONbits.TPC = 0; // 4 External interrupt 0 falling edge interrupt INTCONbits.INT0EP = 0; // 4 External interrupt 1 falling edge interrupt INTCONbits.INT1EP = 0; // 4 External interrupt 2 falling edge interrupt INTCONbits.INT2EP = 0; // 4 External interrupt 3 falling edge interrupt INTCONbits.INT3EP = 0; // 4 External interrupt 4 falling edge interrupt INTCONbits.INT4EP = 0; }

Timer 4 and timer 5 is being used in 32 bit mode. As the data sheet states, in this configuration, it is timer 5 interrupts that is used:

void Init_Timer4_5(void) { // 15 - Timer 4 is off T4CONbits.ON = 0; // 13 - Continue operation when device enters idle mode T4CONbits.SIDL = 0; // 7 - Gated time accumulation is disabled T4CONbits.TGATE = 0; // 6 - 4 - 1:8 prescale to achieve a 1uS unit time T4CONbits.TCKPS = 3; // 3 - Timer 4 and 5 set for 32 bit operation T4CONbits.T32 = 1; // 1 - Use internal Peripheral clock T4CONbits.TCS = 0; // Setting Timer 5 priority to level 4 of 7 IPC5bits.T5IP = 4; // setting timer 5 sub priority to level 1 of 3 IPC5bits.T5IS = 1; // Clear timer interrupt flag IFS0bits.T5IF = 0; // Enable timer interrupts IEC0bits.T5IE = 1; }

The timers are started with the following function:

void Time_Out(unsigned int uTime) { T4CONbits.ON = 0; TMR4 = 0; TMR5 = 0; Global_TimeOut = 0; PR4 = uTime; T4CONbits.ON = 1; }

As far as I can tell, I have done everything necessary.

Let me know if you require any additional information.

Volcano · Accepted Answer · 2015-05-04 19:44:19Z

I also had to turn on the global interrupts. Its somewhat of a hidden bit.

It is a bit within the Coprocessor status register, and you can enable it by using:

__asm__("EI");

or disable it by using:

__asm__("DI");

Oleg Mazurov · Accepted Answer · 2015-05-01 23:50:58Z

This is the sample that works, I'm pasting it from one of my current projects:

int main(void) { T2CONbits.T32 = 1; //32-bit timer T2CONbits.ON = 1; //start PR2 = 0xFFFF; PR3 = 0xFFFF; IPC3bits.T3IP = 1; //interrupt priority IFS0CLR = _IFS0_T3IF_MASK; IEC0SET = _IEC0_T3IE_MASK; //Timer 3 interrupt (for 2-3 pair while(1); } //counts Timer2-3 overflows. extern "C" void __ISR(_TIMER_3_VECTOR, IPL1AUTO) t23ISR() { Rolls_t23++; //increment rollover counter IFS0CLR = _IFS0_T3IF_MASK; //clear interrupt }

You should be able to paste it into MPLABX, set the breakpoint inside the ISR and see the program hitting this breakpoint every once in a while (check period and decrease if necessary). If you don't see it make sure your conf.bits are right and the micro is actually executing the code (set another breakpoint to while(1), for example).

@OlgeMazurov This code did not work for me, so I think there is a problem with my setup, I will update the question momentarily to include more information on the setup. — Volcano
– Volcano, Commented May 4, 2015 at 19:04

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