Update main.c

Initialize Systick setting

main.c

@@ -9,3 +9,10 @@
 #define CLKINT (1 << 2)      // Bit 2 of CSR to specify CPU clock
 #define CLOCK_HZ 16000000    // Clock frequency of EK-TM4C123GXL
 #define SYSTICK_RELOAD_VALUE(us) ((CLOCK_HZ / 1000000) * (us) - 1)   // SysTick reload value in microseconds based on clock frequency
+
+void systick_setting(void) 
+{
+    STRELOAD = SYSTICK_RELOAD_VALUE(1000);     // RELOAD VALUE FOR 1ms
+    STCTRL |= ENABLE | CLKINT;                 // Enable SysTick with system clock
+    STCURRENT = 0;                             // Clear current value
+}