Please explain What the code below is doing line by line:

#include //Exact-width integer types

#include //Driver library

#define DCO_FREQ 48e6 //unit: Hz; DCO nominal frequencies: 1.5, 3, 6, 12, 24,

48 MHz.

#define TIMER0_FREQ 1 //unit: Hz

//function prototypes

void initDevice(void);

void initTimer(void);

void initGPIO(void);

//global variables

uint32_t clockMCLK;

void main(void)

{

initDevice();

initTimer();

initGPIO();

//Enable interrupts

Interrupt_enableSleepOnIsrExit();

Interrupt_enableMaster();

Timer32_startTimer(TIMER32_0_BASE, false);

while(1)

{

PCM_gotoLPM0();

}

}

void initDevice(void)

{

WDT_A_holdTimer(); //stop Watchdog timer

//Change VCORE to 1 to support a frequency higher than 24MHz.

//See data sheet for Flash wait-state requirement for a given frequency.

PCM_setPowerState(PCM_AM_LDO_VCORE1);

FlashCtl_setWaitState(FLASH_BANK0, 1);

FlashCtl_setWaitState(FLASH_BANK1, 1);

//Enable FPU for DCO Frequency calculation.

FPU_enableModule();

FPU_enableLazyStacking(); // Required to use FPU within ISR.

//Only use DCO nominal frequencies: 1.5, 3, 6, 12, 24, 48MHz.

CS_setDCOFrequency(DCO_FREQ);

//Divider: 1, 2, 4, 8, 16, 32, 64, or 128.

//SMCLK used by UART and ADC14.

CS_initClockSignal(CS_MCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_1);

CS_initClockSignal(CS_HSMCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_8);

CS_initClockSignal(CS_SMCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_16);

clockMCLK = CS_getMCLK();

}

void initTimer(void)

{

Timer32_initModule(TIMER32_0_BASE, TIMER32_PRESCALER_1, TIMER32_32BIT,

TIMER32_PERIODIC_MODE);

Timer32_setCount(TIMER32_0_BASE, clockMCLK/TIMER0_FREQ);

Timer32_enableInterrupt(TIMER32_0_BASE);

Interrupt_enableInterrupt(INT_T32_INT1); //Enable Timer32_0 interrupt in the

interrupt controller.

}

void initGPIO(void)

{

//Configure P1.0 as output.

//P1.0 is connected to a red LED on LaunchPad.

GPIO_setAsOutputPin(GPIO_PORT_P1, GPIO_PIN0);

}

//Timer32_0 ISR

void T32_INT1_IRQHandler(void)

{

Timer32_clearInterruptFlag(TIMER32_0_BASE);

GPIO_toggleOutputOnPin(GPIO_PORT_P1, GPIO_PIN0);

}