#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;                 // Make it edge-sensitive
    GPIO_PORTF_IBE_R = 0x00;                 // Trigger on one edge
    GPIO_PORTF_IEV_R = 0x00;                  // Falling edge event
    GPIO_PORTF_IM_R  |= 0x11;                  // Unmask interrupts for PF0 and PF4
}

void UART1_WRITE(char data)
{
    while (UART1_FR_R & 0x20);       // Wait until TX FIFO is not full
    UART1_DR_R = data;               // Write data to UART data register
}

char UART1_READ(void)
{
    while (UART1_FR_R & 0x10);       // Wait until RX FIFO is not empty
    return (char)UART1_DR_R;         // Return received data
}



void GPIOF_interruptHandler(void)               // Interrupt handler for GPIO Port F
{
    //delay(200000); // Debounce delay
    // Check PF4 (Switch 2)
    if (GPIO_PORTF_RIS_R & 0x10)  // Check if PF4 caused the interrupt
    {
        //GPIO_PORTF_DATA_R |= 0x02;              // Toggle RED LED (PF1)
        //delay(500000);
        UART1_WRITE(0xF0);
        STATUS_LED(UART1_READ());
        //GPIO_PORTF_DATA_R = 0x00;              // Toggle RED LED (PF1)
        GPIO_PORTF_ICR_R = 0x10;                // Clear interrupt flag for PF4
    }

    // Check PF0 (Switch 1)
    if (GPIO_PORTF_RIS_R & 0x01)  // Check if PF0 caused the interrupt
    {
        //GPIO_PORTF_DATA_R |= 0x04;              // Toggle RED LED (PF1)
        //delay(500000);
        UART1_WRITE(0xAA);
        //GPIO_PORTF_DATA_R = 0x00;
        STATUS_LED(UART1_READ());
        GPIO_PORTF_ICR_R = 0x01;                // Clear interrupt flag for PF0
    }
}
int main(void)                                 // MAIN FUNCTION
{
    GPIO_PORT_F_init();                        // GPIO INITIALISATION FUNCTION

    while (1)
    {
    }
}