add GPIOF interrupt handler

main.c

@@ -38,3 +38,19 @@ void delay(int us)                              //DEFINING DELAY FUNCTION
     while ((STCTRL & (1 << 16)) == 0);       // Wait until flag is set
     STCTRL &= 0x0;                           // Stop the timer
 }
+
+void GPIOF_interruptHandler(void)            // Interrupt handler for GPIO Port F
+{
+    delay(200000);                           // DEBOUNCE DELAY
+    if (GPIO_PORTF_RIS_R & 0x10)             // CHECK IF SWITCH 1 CAUSED INTERRUPT
+    {
+        GPIO_PORTF_DATA_R ^= 0x02;           // TOGGLE RED LED
+        GPIO_PORTF_ICR_R = 0x10;             // CLEAR INTERRUPT FLAG FOR SWITCH 1
+    }
+
+    if (GPIO_PORTF_RIS_R & 0x01)             // CHECK IF SWITCH 2 CAUSED INTERRUPT
+    {
+        GPIO_PORTF_DATA_R ^= 0x02;           // TOGGLE RED LED
+        GPIO_PORTF_ICR_R = 0x01;             // CLEAR INTERRUPT FLAG FOR SWITCH 1
+    }
+}