pmm_Reset_LPMx_5.c

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//******************************************************************************
// MSP430FR59xx PMM Test
// This example shows transitions between a user Reset via the reset button, a
// software triggered BOR, a previous LPMx.5 state indicator flag, and entrance 
// into LPM4.5. Reading the reset interrupt flag from PMMIFG register is equivalent
// to reading from reset vector register.
//
// Upon device power on you will see the following sequence of LED's
// X = off
// O = on
//
// _0 = On indicates BOR
// _6 = On indicates Reset (from user button)
// _5 = on indicates device was previously in LPMx.5 state before the reset
// _4 = On indicates device is NOT sleeping.  Off means device is in LPM4.5
//*******************************************************************************
//
//  1) Power on device:
//      X0 X6 X5 O4             LED4 is on, device is running and was not in LPM4.5 mode previously.
//
//  2) Press User Reset button:
//
//      X0 O6 X5 O4             Device is running and has reset due to RST pin
//      O0 X6 X5 O4             Device is running and has reset due to a software BOR
//      X0 X6 X5 X4             Device is now in LPM4.5
//
//  3) Press User Reset button:
//      Device will restart the sequence beginning at step 2).
//
//
//********************************************************************************
#include "driverlib.h"
 
void main(void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
      /*
       * Base Address of PMM,
       * By default, the pins are unlocked unless waking
       * up from an LPMx.5 state in which case all GPIO
       * are previously locked.
       *
       */
    PMM_unlockLPM5();
    //Set P3.4, 3.5, 3.6, 3.0 as output pins.
    /*
 
     * Select Port 3
     * Set Pin 4, 5, 6, 0 as output
     */
    GPIO_setAsOutputPin(
            GPIO_PORT_P3,
            GPIO_PIN4 + GPIO_PIN5 + GPIO_PIN6 + GPIO_PIN0
    );
    //Set P3.5, 3.6, 3.0 Low.
    /*
 
     * Select Port 3
     * Set Pin 5, 6, 0 as Low
     */
    GPIO_setOutputLowOnPin(
            GPIO_PORT_P3,
            GPIO_PIN5 + GPIO_PIN6 + GPIO_PIN0
    );
    //Set P3.4 as High.
    /*
 
     * Select Port 3
     * Set Pin 4 as High
     */
    GPIO_setOutputHighOnPin(
            GPIO_PORT_P3,
            GPIO_PIN4
    );
 
    if (PMM_getInterruptStatus(PMM_RST_INTERRUPT))  // Was this reset triggered by the Reset flag?
  {
          PMM_clearInterrupt(PMM_RST_INTERRUPT);            // Clear reset flag
        GPIO_setOutputHighOnPin(
                GPIO_PORT_P3,
                GPIO_PIN6
        );
      __delay_cycles(1000000);                                                  // to include a visual delay.
 
      //Trigger a software Brown Out Reset (BOR)
        /*
         * Base Address of PMM,
         * Forces the devices to perform a BOR.
         */
      PMM_trigBOR();                                // Software trigger a BOR.
  }
 
    if (PMM_getInterruptStatus(PMM_BOR_INTERRUPT))  // Was this reset triggered by the BOR flag?
    {
          PMM_clearInterrupt(PMM_BOR_INTERRUPT);            // Clear BOR flag
        GPIO_setOutputHighOnPin(
                GPIO_PORT_P3,
                GPIO_PIN0
        );
      __delay_cycles(1000000);                                                  // to include a visual delay.
      GPIO_setOutputLowOnPin(
                GPIO_PORT_P3,
                GPIO_PIN4 + GPIO_PIN0
        );
 
       //Disable Regulator
        /*
         * Base Address of PMM,
         * Regulator is turned off when going to LPM3/4.
         * System enters LPM3.5 or LPM4.5, respectively.
         */
      PMM_turnOffRegulator();
      __bis_SR_register(LPM4_bits); // Enter LPM4.5, This automatically locks
                                      // (if not locked already) all GPIO pins.
                                      //  and will set the LPM5 flag and set the LOCKLPM5 bit
                                      //  in the PM5CTL0 register upon wake up.
    }
 
    while (1)
    {
        __no_operation();             // Don't sleep
    }
}