pmm_ex3_lowCurrentConsumption.c

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/* --COPYRIGHT--,BSD
 * Copyright (c) 2017, Texas Instruments Incorporated
 * All rights reserved.
 *
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 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * --/COPYRIGHT--*/
//******************************************************************************
//******************************************************************************
 
#include "driverlib.h"
 
#define DUTY_CYCLE1     32
#define TIMER_PERIOD    40
 
void main (void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
    //Set DCO FLL reference = REFO
    UCS_initClockSignal(UCS_FLLREF,
        UCS_REFOCLK_SELECT,
        UCS_CLOCK_DIVIDER_1
        );
 
    //Set ACLK = REFO
    UCS_initClockSignal(UCS_ACLK,
        UCS_REFOCLK_SELECT,
        UCS_CLOCK_DIVIDER_1
        );
 
    //~ 32*32768 = 1048576
    UCS_initFLLSettle(1048,
        32
        );
 
    //Monitor low side is turned off
    PMM_disableSvmL();
 
    //Monitor high side is turned off
    PMM_disableSvmH();
 
    //SVS Low side is turned on
    PMM_enableSvsL();
 
    //Reset (POR) on SVS trigger
    PMM_enableSvsLReset();
 
    //Slow wake up from LPMs,// SVSL turns off in LPM3,power-save
    PMM_disableSvsLInLPMSlowWake();
 
    //SVSL turns off in LPM3,power-save
    PMM_enableSvsH();
 
    //SVS High side is turned on
    PMM_enableSvsHReset();
 
    //Normal Perf mode,
    PMM_disableSvsHInLPMNormPerf();
    //Wait until high side, low side settled
    while ( 0 == PMM_getInterruptStatus(
                PMM_SVSMLDLYIFG + PMM_SVSMHDLYIFG )
            ) ;
 
    //SVSH turns off in LPM3,power-save
    PMM_clearPMMIFGS();
 
    //Clear P1.0 LED off
    GPIO_setOutputLowOnPin(
        GPIO_PORT_P1,
        GPIO_PIN0
        );
 
    //Set P1.0 to output direction
    GPIO_setAsOutputPin(
        GPIO_PORT_P1,
        GPIO_PIN0
        );
 
    //P1.5 TA0.4 output 50% duty cycle
    //Set P1.0 to output direction
    GPIO_setAsPeripheralModuleFunctionOutputPin(
        GPIO_PORT_P1,
        GPIO_PIN5
        );
 
    //Start timer in upMode sourced by ACLK
    Timer_A_clearTimerInterrupt(TIMER_A0_BASE);
 
    Timer_A_initUpModeParam initUpParam = {0};
    initUpParam.clockSource = TIMER_A_CLOCKSOURCE_ACLK;
    initUpParam.clockSourceDivider = TIMER_A_CLOCKSOURCE_DIVIDER_1;
    initUpParam.timerPeriod = TIMER_PERIOD;
    initUpParam.timerInterruptEnable_TAIE = TIMER_A_TAIE_INTERRUPT_ENABLE;
    initUpParam.captureCompareInterruptEnable_CCR0_CCIE =
        TIMER_A_CCIE_CCR0_INTERRUPT_DISABLE;
    initUpParam.timerClear = TIMER_A_DO_CLEAR;
    initUpParam.startTimer = true;
    Timer_A_initUpMode(TIMER_A0_BASE, &initUpParam);
 
    //Generate PWM using capture
    Timer_A_clearCaptureCompareInterrupt(TIMER_A0_BASE,
        TIMER_A_CAPTURECOMPARE_REGISTER_4
        );
 
    Timer_A_initCompareModeParam initCompParam = {0};
    initCompParam.compareRegister = TIMER_A_CAPTURECOMPARE_REGISTER_4;
    initCompParam.compareInterruptEnable = TIMER_A_CAPTURECOMPARE_INTERRUPT_ENABLE;
    initCompParam.compareOutputMode = TIMER_A_OUTPUTMODE_SET_RESET;
    initCompParam.compareValue = DUTY_CYCLE1;
    Timer_A_initCompareMode(TIMER_A0_BASE, &initCompParam);
 
    //Enter LPM3, enable interrupts
    __bis_SR_register(LPM3_bits + GIE);
    //For debugger
    __no_operation();
}
 
//******************************************************************************
//
//This is the Timer0_A5 interrupt vector service routine.
//
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=TIMER0_A1_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(TIMER0_A1_VECTOR)))
#endif
void TIMER0_A1_ISR (void)
{
    switch (__even_in_range(TA0IV,14)){
        case  0: break;                          //No interrupt
        case  2: break;                          //CCR1 not used
        case  4: break;                          //CCR2 not used
        case  6: break;                          //reserved
        case  8: break;                          //reserved
        case 10: break;                          //reserved
        case 12: break;                          //reserved
        case 14:                                 //overflow
            //Toggle P1.0
            GPIO_toggleOutputOnPin(
            GPIO_PORT_P1,
            GPIO_PIN0
            );
            break;
        default: break;
    }
}