Add Delay Function

main.c

@@ -29,3 +29,12 @@ void systick_setting(void)                      // SYSTICK SETUP FUNCTION
     STCTRL |= (1 << 0) | (1 << 2);              // Enable SysTick with system clock
     STCURRENT = 0;                               // Clear current value
 }
+
+void delay(int us)                              //DEFINING DELAY FUNCTION
+{
+    STRELOAD = SYSTICK_RELOAD_VALUE(us);        // RELOAD VALUE FOR REQUIRED DELAY
+    STCURRENT = 0;                               // Clear STCURRENT
+    STCTRL |= (1 << 0) | (1 << 2);              // Enable SysTick
+    while ((STCTRL & (1 << 16)) == 0);          // Wait until flag is set
+    STCTRL &= 0x0;                               // Stop the timer
+}