#include <stdint.h>
#include <stdbool.h>
#include "tm4c123gh6pm.h"

void GPIO_PORT_F_init(void)
{
    SYSCTL_RCGC2_R |= 0x00000020;             // ENABLE CLOCK TO GPIOF
    GPIO_PORTF_LOCK_R = 0x4C4F434B;           // UNLOCK COMMIT REGISTER
    GPIO_PORTF_CR_R   = 0x1F;                 // MAKE PORTF0 CONFIGURABLE
    GPIO_PORTF_DEN_R  = 0x1F;                 // SET PORTF DIGITAL ENABLE
    GPIO_PORTF_DIR_R  = 0x0E;                 // SET PF0, PF4 as input and PF1, PF2 and PF3 as output
    GPIO_PORTF_PUR_R  = 0x11;                 // PORTF PF0 and PF4 IS PULLED UP

    NVIC_EN0_R |= 1 << 30;
    GPIO_PORTF_IS_R  = 0x00;                  // EDGE SENSITIVE
    GPIO_PORTF_IBE_R = 0x00;                  // ONE EDGE
    GPIO_PORTF_IEV_R = 0x00;                  // INTERRUPT EVENT FALLING
    GPIO_PORTF_IM_R  |= 0x11;                 // UNMASK INTERRUPT
}

void GPIO_PORT_B_init(void)
{

    SYSCTL_RCGCGPIO_R |= 0x02;                // ENABLE CLOCK FOR GPIOB
    SYSCTL_RCGCUART_R |= 0x02;                // ENABLE CLOCK FOR UART1

    GPIO_PORTB_DEN_R |= 0x03;                 // DIGITAL ENABLE FOR PB0 AND PB1
    GPIO_PORTB_AFSEL_R |= 0x03;               // ENABLE ALTERNATE FUNCTION ON PB0,PB1

    GPIO_PORTB_PCTL_R = (GPIO_PORTB_PCTL_R & 0xFFFFFF00) | 0x00000011; // SET PB0, PB1 FOR UART FUNCTIONALITY

    UART1_CTL_R &= ~0x01;                     // DISABLE UART1 DURING SETUP
    UART1_IBRD_R = 104;                       // SET INTEGER PART OF BAUD RED FOR 9600 BAUD FORMULA:
    UART1_FBRD_R = 11;                        // SET FRACTIONAL PART OF BAUD RATE
    UART1_LCRH_R = 0x62;                      // SET 8-BIT, ODD PARITY, STOP BIT-1
    UART1_CC_R = 0x00;                        // USE SYSTEM CLOCK

    UART1_CTL_R |= 0x301;                     // ENABLE UART1, RX AND TX
}

int main(void)                                            // MAIN FUNCTION
{
    GPIO_PORT_F_init();                                   // GPIO PORT F INITIALISATION FUNCTION
    GPIO_PORT_B_init();                                   // GPIO PORT B INITIALISATION FUNCTION

    while (1)
    {
       
}