Add delay function

main.c

@@ -66,6 +66,17 @@ void systick_setting(void)                      // SYSTICK SETUP FUNCTION
 }
 
 
+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
+}
+
+
+
 
 void GPIOF_interruptHandler(void)               // Interrupt handler for GPIO Port F
 {