Update main.c

Initialize Delay Function

main.c

@@ -16,3 +16,12 @@ void systick_setting(void)
     STCTRL |= ENABLE | CLKINT;                 // Enable SysTick with system clock
     STCURRENT = 0;                             // Clear current value
 }
+
+void delay(int us) 
+{
+    STRELOAD = SYSTICK_RELOAD_VALUE(us);        // RELOAD VALUE FOR REQUIRED DELAY
+    STCURRENT = 0;                              // Clear STCURRENT
+    STCTRL |= ENABLE | CLKINT;                  // Enable SysTick
+    while ((STCTRL & (1 << 16)) == 0);          // Wait until flag is set
+    STCTRL &= ~ENABLE;                          // Stop the timer
+}