1. The following piece of code which is for the initialization of switiches and leds:

• Please explain each line of code by adding comments next to it.

Ex: void Switch_Init() // function initialization for switches

• Mention which ports and corresponding bits are being used for switches and leds respectively. (Please observe the DIR registers carefully)

Ex: PortD bit 0 (PD0) for Led0.

Void Switch_Init()

{

volatile unsigned long loop1;

SYSCTL_RCGC2_R|=SYSCTL_RCGC2_GPIOG;

loop1=SYSCTL_RCGC2_R;

GPIO_PORTG_DIR_R &=~0x78;

GPIO_PORTG_AFSEL_R &=0x00;

GPIO_PORTG_DEN_R |=0x78;

GPIO_PORTG_PUR_R |=0x78;

}

Void Led_Init()

{

volatile unsigned long loop2;

SYSCTL_RCGC2_R|=SYSCTL_RCGC2_GPIOD;

Loop2=SYSCTL_RCGC2_R;

GPIO_PORTD_DIR_R |=0x0F;

GPIO_PORTG_AFSEL_R &=0x00;

GPIO_PORTD_DEN_R |=0x0F;

}

int main()

{

Switch_Init();

Led_Init();

//

//Do stuff

//

}