Update main.c

Port F initialization

main.c

@@ -1,3 +1,19 @@
 #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
+}