CCS/MSP430FR2311: GPIO Interrupt Pin 2.6 LPM

Sparrow Tech

Tool/software: Code Composer Studio

I'm trying to get the launchpad to go into LPM3 unless it receives a high signal (3.3V) from pin 2.6 ( I have an LED turning on so that I can see it on the launchpad) which is a GPIO interrupt pin.
I have pin 2.6 connected to the ON signal from a xbee module. Not sure if I am setting up my interrupt vector correctly.Thanks in advance.

#include <msp430.h>

int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
// Disable the GPIO power-on default high-impedance mode
// to activate previously configured port settings
PM5CTL0 &= ~LOCKLPM5;
P1DIR |= BIT1; // Set P1.0 to output direction


P2DIR &= ~BIT6; 
P2REN &= ~BIT6;
P2IES &= ~BIT6; // P2.6 Lo/High edge
P2IE |= BIT6;
P2IFG &= ~BIT6;
__bis_SR_register(GIE);          // Global interrupts Enable


}

// Port 2 interrupt service routine
#pragma vector=PORT2_VECTOR
__interrupt void Port2_ISR(void)
{

    P2IFG &= ~BIT6; // Clear P2.6 IFG
    P1OUT |= BIT0; // led ON

__bic_SR_register_on_exit(LPM3_bits); // Exit LPM3
}

over 8 years ago

0 Ling Zhu2 over 8 years ago

TI__Genius 9570 points

Hi Sparrow,

//#include <msp430.h>
//
//int main(void)
//{
//    WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
//    // Disable the GPIO power-on default high-impedance mode
//    // to activate previously configured port settings
//    PM5CTL0 &= ~LOCKLPM5;
//    P1DIR |= BIT0; // Set P1.0 to output direction
//
//
//    P2DIR &= ~BIT6;
//    P2REN &= ~BIT6;
//    P2IES &= ~BIT6; // P2.6 Lo/High edge
//    P2IE |= BIT6;
//    P2IFG &= ~BIT6;
//    __bis_SR_register(GIE);          // Global interrupts Enable
//
//
//}
//
//// Port 2 interrupt service routine
//#pragma vector=PORT2_VECTOR
//__interrupt void Port2_ISR(void)
//{
//
//    P2IFG &= ~BIT6; // Clear P2.6 IFG
//    P1OUT |= BIT0; // led ON
//
//    __bic_SR_register_on_exit(LPM3_bits); // Exit LPM3
//}


#include <msp430.h>

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog timer

    // Configure GPIO
    P1OUT &= ~BIT0;                         // Clear P1.0 output latch for a defined power-on state
    P1DIR |= BIT0;                          // Set P1.0 to output direction

    P2OUT &= ~BIT6;                         // Configure P2.6 as pulled-down
    P2REN |= BIT6;                          // P2.6 pull-down register enable
    P2IES &= ~BIT6;                         // P2.6 Low/High edge
    P2IE |= BIT6;                           // P2.6 interrupt enabled

    // Disable the GPIO power-on default high-impedance mode
    // to activate previously configured port settings
    PM5CTL0 &= ~LOCKLPM5;

    P2IFG &= ~BIT6;                         // P2.6 IFG cleared

    while(1)
    {
        __bis_SR_register(LPM3_bits | GIE); // Enter LPM3 w/interrupt
        __no_operation();                   // For debug

    }
}

// Port 2 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=PORT2_VECTOR
__interrupt void Port_2(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(PORT2_VECTOR))) Port_2 (void)
#else
#error Compiler not supported!
#endif
{
    P2IFG &= ~BIT6;                         // Clear P2.6 IFG
    P1OUT ^= BIT0;                          // P1.0 = toggle
    __bic_SR_register_on_exit(LPM3_bits);   // Exit LPM3
}

Regards,

Ling

0 Sparrow Tech over 8 years ago in reply to Ling Zhu2

Prodigy 150 points

Thank you very much for your response. This cleared up for me how to set up the pull down resistor.

However, whenever I run this code and apply 3.3V to pin2.6 it turns on the LED (not toggles it) on every OTHER rising edge. I want it to turn on when 3.3V is applied and the LED to turn off when it's not.

Any solutions as to why it maybe reading every other rising edge?

0 Bruce McKenney over 8 years ago in reply to Sparrow Tech

Guru 103195 points

I suppose the "every other" effect comes from

> P1OUT ^= BIT0; // P1.0 = toggle

I think you're free to replace this with code of your choosing. One possibility is to reverse the interrupt sense in P2IES, perhaps after some debouncing.

0 Ling Zhu2 over 8 years ago in reply to Bruce McKenney

TI__Genius 9570 points

YES

0 Ling Zhu2 over 8 years ago in reply to Sparrow Tech

TI__Genius 9570 points

Sparrow Tech said:
Thank you very much for your response. This cleared up for me how to set up the pull down resistor.

However, whenever I run this code and apply 3.3V to pin2.6 it turns on the LED (not toggles it) on every OTHER rising edge. I want it to turn on when 3.3V is applied and the LED to turn off when it's not.

Any solutions as to why it maybe reading every other rising edge?

#include <msp430.h>

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog timer

    // Configure GPIO
    P1OUT &= ~BIT0;                         // Clear P1.0 output latch for a defined power-on state
    P1DIR |= BIT0;                          // Set P1.0 to output direction

    P2OUT &= ~BIT6;                         // Configure P2.6 as pulled-down
    P2REN |= BIT6;                          // P2.6 pull-down register enable
    P2IES &= ~BIT6;                         // P2.6 Low/High edge
    P2IE |= BIT6;                           // P2.6 interrupt enabled

    // Disable the GPIO power-on default high-impedance mode
    // to activate previously configured port settings
    PM5CTL0 &= ~LOCKLPM5;

    P2IFG &= ~BIT6;                         // P2.6 IFG cleared

    __bis_SR_register(GIE);

    while(1)
    {
//        __bis_SR_register(LPM3_bits | GIE); // Enter LPM3 w/interrupt
        __no_operation();                   // For debug

        if(!(P2IN&BIT6))
            P1OUT &= ~BIT0;

    }
}

// Port 2 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=PORT2_VECTOR
__interrupt void Port_2(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(PORT2_VECTOR))) Port_2 (void)
#else
#error Compiler not supported!
#endif
{
    P2IFG &= ~BIT6;                         // Clear P2.6 IFG
    P1OUT |= BIT0;                          // P1.0 = 1
//    __bic_SR_register_on_exit(LPM3_bits);   // Exit LPM3
}

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CCS/MSP430FR2311: GPIO Interrupt Pin 2.6 LPM