Add example_submenu.py

example_submenu.py

@@ -0,0 +1,28 @@
+from lcdMenu import lcdMenu
+from machine import Pin, I2C
+from PCF8574T import I2C_LCD
+
+prev_btn = Pin(13, Pin.IN, Pin.PULL_DOWN)  # input of the first btn
+next_btn = Pin(14, Pin.IN, Pin.PULL_DOWN)  # input of the second btn
+ok_btn   = Pin(15, Pin.IN, Pin.PULL_DOWN)  # input of switch
+
+LCD = I2C_LCD(I2C(0, sda=Pin(8), scl=Pin(9), freq=400000),0x27,2, 16)
+
+def first_callback():
+    print("first_callback() called!")
+def second_cb():
+    print("second_cb() called")
+def third_cb():
+    print("third_cb() called")
+    return True
+
+
+menuItems = [("first item", first_callback),
+             ("second item", second_cb),
+             ("third item", third_cb)]
+button_mappings = {"prev_btn":prev_btn, "next_btn": next_btn, "ok_btn": ok_btn}
+
+submenu = lcdMenu(LCD, button_mappings, menuItems, scroll_direction=True, cycle=False, hide_menu_name=False, name="Submenu!")
+
+mainmenu = lcdMenu(LCD, button_mappings, [("Sub menu",submenu.run)], scroll_direction=False, cycle=True, hide_menu_name=False, name="Main menu!")
+mainmenu.run()