gpio_ex2_inputCapture.c

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//******************************************************************************
//   Software Port Interrupt Service on P1.1 from LPM4 with
//                     Internal Pull-up Resistance Enabled
//
//   A hi "TO" low transition on P1.1 will trigger P1_ISR which,
//   toggles P1.0. P1.1 is internally enabled to pull-up. Normal mode is
//   LPM4 ~ 0.1uA. LPM4 current can be measured with the LED removed, all
//   unused Px.x configured as output or inputs pulled high or low. On the
//   MSP430FR5969 LaunchPad, P1.1 is connected to button S1. The interrupt is 
//   triggered once the switch is released.
//   ACLK = n/a, MCLK = SMCLK = default DCO
//
//  Tested On: MSP430FR5969
//             -----------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//      /|\   |                 |
//       --o--|P1.1         P1.0|-->LED
//      \|/
//
//   This example uses the following peripherals and I/O signals.  You must
//   review these and change as needed for your own board:
//   - GPIO Port peripheral
//
//   This example uses the following interrupt handlers.  To use this example
//   in your own application you must add these interrupt handlers to your
//   vector table.
//   - PORT1_VECTOR
//******************************************************************************
#include "driverlib.h"
 
void main (void)
{
    //Stop watchdog timer
    WDT_A_hold(WDT_A_BASE);
 
    //Set P1.0 to output direction
    GPIO_setAsOutputPin(
        GPIO_PORT_P1,
        GPIO_PIN0
        );
 
    //Enable P1.1 internal resistance as pull-Up resistance
    GPIO_setAsInputPinWithPullUpResistor(
        GPIO_PORT_P1,
        GPIO_PIN1
        );
 
    //P1.1 Hi/Lo edge
    GPIO_selectInterruptEdge(
        GPIO_PORT_P1,
        GPIO_PIN1,
        GPIO_HIGH_TO_LOW_TRANSITION
        );
 
    /*
     * Disable the GPIO power-on default high-impedance mode to activate
     * previously configured port settings
     */
    PMM_unlockLPM5();
 
    //P1.1 IFG cleared
    GPIO_clearInterrupt(
        GPIO_PORT_P1,
        GPIO_PIN1
        );
 
    //P1.1 interrupt enabled
    GPIO_enableInterrupt(
        GPIO_PORT_P1,
        GPIO_PIN1
        );
 
    //Enter LPM4 w/interrupt
    __bis_SR_register(LPM4_bits + GIE);
 
    //For debugger
    __no_operation();
}
 
//******************************************************************************
//
//This is the PORT1_VECTOR interrupt vector service routine
//
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=PORT1_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(PORT1_VECTOR)))
#endif
void Port_1 (void)
{
    //P1.0 = toggle
    GPIO_toggleOutputOnPin(
        GPIO_PORT_P1,
        GPIO_PIN0
        );
 
 
    //P1.1 IFG cleared
    GPIO_clearInterrupt(
        GPIO_PORT_P1,
        GPIO_PIN1
        );
}