TI_ISR_TRAP MSP430FR6989

[Mattjd]

Hello,

When I am executing my code, if I press down the button P1.1 during debugging mode, LED associated with P1.0 stops blinking. When I pause the debugging session, this file pops up

Code: [Select]

;******************************************************************************
;* ISR_TRAP.ASM - v16.9.4                                                     *
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;******************************************************************************


;-----------------------------------------------------------------------------
;-- default ISR handler if user does not supply
;-- simply puts device into lpm0
;-----------------------------------------------------------------------------

    .sect ".text:_isr:__TI_ISR_TRAP"
.align 2
.global __TI_ISR_TRAP
__TI_ISR_TRAP:
        BIS.W     #(0x0010),SR
        JMP __TI_ISR_TRAP

        NOP                     ; CPU40 Compatibility NOP

;******************************************************************************
;* BUILD ATTRIBUTES                                                           *
;*    HW_MPY_INLINE_INFO=1:  file does not have any inlined hw mpy            *
;*    HW_MPY_ISR_INFO   =1:  file does not have ISR's with mpy or func calls  *
;******************************************************************************
        .battr "TI", Tag_File, 1, Tag_HW_MPY_INLINE_INFO(1)
        .battr "TI", Tag_File, 1, Tag_HW_MPY_ISR_INFO(1)

My code

Code: [Select]

// Author: Matt Dxxxxxxxx
// Lab: 3
// Section: Button Delay
// Device: FR6989
#include <msp430.h>

volatile unsigned int button_count;

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;               // stop watchdog timer
    PM5CTL0 &= ~LOCKLPM5;                   // Disable the GPIO power-on default high-impedance mode
                                            // to activate previously configured port settings

    P1DIR |= BIT0;                          // Set P1.0 to output direction -- LED
    P9DIR |= BIT7;                          // Set P9.7 to output direction --- LED

    P1DIR &= ~BIT1;                         // Set P1.1 to button input
    P1REN |= BIT1;                          // Enable Pull Up Resistor for pin1.1
    P1OUT |= BIT1;                          //SPECIFIED AS A PULLUP FOR P1.1
    P1IES &= ~BIT1;                          //Have flag set on Low to High
    P1IE |= BIT1;                           //enable interrupts for Pin 1.1
    P1IFG &= ~BIT1;                         //Clear Pin 1.1 flag so no immediate interrupt

    P1DIR &= ~BIT2;                         // Set P1.2 to button input
    P1REN |= BIT2;                          // Enable Pull Up Resistor for pin1.2
    P1OUT |= BIT2;                          //SPECIFIED AS A PULLUP FOR P1.2
    P1IES |= BIT2;                          //Have flag set on High to Low
    P1IE |= BIT2;                           //enable interrupts for Pin 1.1
    P1IFG &= ~BIT2;                         //Clear Pin 1.1 flag so no immediate interrupt

    TA0CCTL0 |= CCIE;                        // TA0CCR0 interrupt enabled
    TA0CCR0 = 3277;                          //Set value of TA0CCR0 for comparison
    TA0CTL |= TASSEL_1 + MC_1;              //Pick ACLK & Set Counter to Up Mode
    TA0CTL |= TACLR;                        //Clear Timer A0

    TA1CCTL0 |= CCIE;                      // TA1CCR0 interrupt enabled
    TA1CCR0 = 512;                         //Set value of TA1CCR0 for comparison
    TA1CTL |= ID_3;                        //Divide clock by 8, ACLK will be chosen, so 4096 hz
    TA1EX0 |= TAIDEX_7;                    //Divide ACLK further by 8 to 512 hz
    TA1CTL |= TACLR;                       //Clear Timer A1

    _enable_interrupt();

    for(;;)
    {
        while(!(P1IN & BIT1))
        {
            if(TA1R == 0)
            {
                TA1CTL |= TASSEL_1 + MC_1;    //Pick ACLK & Set Counter to Up Mode
            }
        }
    }

}


#pragma vector = TIMER0_A0_VECTOR
__interrupt void TimerA0_ISR (void)
{
    P1OUT ^= BIT0;
}

#pragma vector = TIMER1_A1_VECTOR
__interrupt void TimerA1_ISR (void)
{
    P9OUT ^= BIT7;
    button_count++;
}

#pragma vector = PORT1_VECTOR
__interrupt void P1_ISR(void)
{
    switch(P1IV)
    {
    case P1IV_P1IFG1:
        {
            TA0CCR0 = 3277*button_count;          //slow down blink speed
            break;
        }
    case P1IV_P1IFG2:
        {
            TA0CCR0 = 3277;                       //reset blink speed
            break;
        }
    }
}

What I am attempting to do is count the number of seconds that I have the button associated with P1.1 held down, so when I hold down the button, Timer A1 gets activated, every second it enters TimerA1_ISR, blinks LED P9.7 (to indicate a second has passed), and increments button_count. When I let go of button P1.1, I should enter P1_ISR and change the value TA0CCR0, which alters the led frequency (slowing it down) of P1.0

I think something is wrong with my TimerA1_ISR but Idk what. I set a break for it, but never enter it. When I hold down the button, the LED P1.0 stops blinking, I pause the debugger and the isr_trap comes up.

edit: when the LED stops blinking and I pause the debug, SR_CPUOFF = 1, indicating LPM0, which makes sense that the LED stops blinking.

[Cervisia]

Those interrupt vector names can be confusing. From the gcc header file:

Code: [Select]

#define TIMER3_A1_VECTOR        (33)                     /* 0xFFD0 Timer3_A2 CC1, TA */
#define TIMER3_A0_VECTOR        (34)                     /* 0xFFD2 Timer3_A2 CC0 */
#define TIMER2_A1_VECTOR        (36)                     /* 0xFFD6 Timer2_A3 CC1, TA */
#define TIMER2_A0_VECTOR        (37)                     /* 0xFFD8 Timer2_A3 CC0 */
#define TIMER1_A1_VECTOR        (39)                     /* 0xFFDC Timer1_A3 CC1-2, TA1 */
#define TIMER1_A0_VECTOR        (40)                     /* 0xFFDE Timer1_A3 CC0 */
#define TIMER0_A1_VECTOR        (44)                     /* 0xFFE6 Timer0_A5 CC1-4, TA */
#define TIMER0_A0_VECTOR        (45)                     /* 0xFFE8 Timer0_A5 CC0 */

[Mattjd]

How did you access that to find all of this?

[Cervisia]

Er, I just opened the msp430fr6989.h file in an editor and searched for those symbols.