File content as of revision 1:8834bc22c2e7:

#include "mbed.h"
#include "max32630fthr.h"
#include "mxc_config.h"
#include "lp.h"
#include "gpio.h"
#include "rtc.h"
#include "MAX14690.h"

DigitalOut rLED(LED1);
DigitalOut gLED(LED2);
DigitalOut bLED(LED3);

DigitalIn sw1(SW1);

// *****************************************************************************
void RTC_Setup()
{
    rtc_cfg_t RTCconfig;
    
    RTCconfig.compareCount[0] = 1;//1 second timer
    RTCconfig.compareCount[1] = 10;//10 second timer
    RTCconfig.prescaler = RTC_PRESCALE_DIV_2_12; //1Hz clock
    RTCconfig.prescalerMask = RTC_PRESCALE_DIV_2_12;//used for prescaler compare
    RTCconfig.snoozeCount = 0;
    RTCconfig.snoozeMode = RTC_SNOOZE_DISABLE;

    RTC_Init(&RTCconfig);

    RTC_Start();
}

/******************************************************************************/
int main(void)
{
    MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
    
    //check if starting at main because of LP0 wake-up
    if(LP_IsLP0WakeUp()) {
        
    }
    else {
        //We did not wake up from sleep and this is first power-on
        //Only configure RTC the first time around 
        RTC_Setup();
    }

    gLED = LED_ON;
    rLED = LED_ON;
    bLED = LED_ON;

    while(1) {
        
        //hold down switch 1 to prevent the microcontroller from going into LP0
        while(sw1 == 0);
        
        //keep LED on long enough to see it!
        wait_ms(100);
        
        gLED = LED_OFF;
        rLED = LED_OFF;
        bLED = LED_OFF;

        //disable unused PMIC rails to minimize power consumption
        pegasus.max14690.ldo2SetMode(MAX14690::LDO_DISABLED);
        pegasus.max14690.ldo3SetMode(MAX14690::LDO_DISABLED);

        //Clear existing wake-up config
        LP_ClearWakeUpConfig();

        //Clear any event flags
        LP_ClearWakeUpFlags();

        //configure wake-up on RTC compare 0
        //LP_ConfigRTCWakeUp(enable compare 0, enable compare 1, set prescale, set rollover)
        LP_ConfigRTCWakeUp(1, 0, 0, 0);
        
        //read the current RTC timer and add 5 seconds to it
        uint32_t cmp = RTC_GetCount() + 5;
        
        //set RTC to generate an interrupt 5 seconds from current value
        RTC_SetCompare(0,cmp);
        
        //clear comparison flag in the RTC registers
        RTC_ClearFlags(MXC_F_RTC_FLAGS_COMP0);

        LP_EnterLP0();

        //firmware will reset with no prior knowledge on wake-up
    }
}