gpio_ex2_inputCapture.c

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//******************************************************************************
//   Software Port Interrupt Service on S1 from LPM3 with
//                     Internal Pull-up Resistance Enabled
//
//   A hi "TO" low transition on S1 will trigger P1_ISR/P2_ISR which,
//   toggles LED1. S1 is internally enabled to pull-up. LPM3 current
//   can be measured with the LED removed, all
//   unused Px.x configured as output or inputs pulled high or low.
//   ACLK = n/a, MCLK = SMCLK = default DCO
//
//             -----------------
//         /|\|                 |
//          | |                 |
//          --|RST              |
//            |                 |
//       S1-->|                 |-->LED1
//
//
//   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/PORT2_VECTOR
//******************************************************************************
#include "driverlib.h"
#include "Board.h"
 
void main (void)
{
    //Stop watchdog timer
    WDT_A_hold(WDT_A_BASE);
 
    //Set LED1 to output direction
    GPIO_setAsOutputPin(
        GPIO_PORT_LED1,
        GPIO_PIN_LED1
        );
 
    //Enable S1 internal resistance as pull-Up resistance
    GPIO_setAsInputPinWithPullUpResistor(
        GPIO_PORT_S1,
        GPIO_PIN_S1
        );
 
    //S1 interrupt enabled
    GPIO_enableInterrupt(
        GPIO_PORT_S1,
        GPIO_PIN_S1
        );
 
    //S1 Hi/Lo edge
    GPIO_selectInterruptEdge(
        GPIO_PORT_S1,
        GPIO_PIN_S1,
        GPIO_HIGH_TO_LOW_TRANSITION
        );
 
 
    //S1 IFG cleared
    GPIO_clearInterrupt(
        GPIO_PORT_S1,
        GPIO_PIN_S1
        );
 
    PMM_unlockLPM5();
 
    //Enter LPM3 w/interrupt
    __bis_SR_register(LPM3_bits + GIE);
 
    //For debugger
    __no_operation();
}
 
#if GPIO_PORT_S1 == GPIO_PORT_P1
//******************************************************************************
//
//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 P1_ISR (void)
#elif GPIO_PORT_S1 == GPIO_PORT_P2
//******************************************************************************
//
//This is the PORT2_VECTOR interrupt vector service routine
//
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=PORT2_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(PORT2_VECTOR)))
#endif
void P2_ISR (void)
#endif // #if GPIO_PORT_S1
{
    //LED1 = toggle
    GPIO_toggleOutputOnPin(
        GPIO_PORT_LED1,
        GPIO_PIN_LED1
        );
 
    //S1 IFG cleared
    GPIO_clearInterrupt(
        GPIO_PORT_S1,
        GPIO_PIN_S1
        );
}