The tsk_main() task receives what is put on the
key_queue by the keyboard task. Based on the received info it
creates a string that reflects the last button event. The string is then written to the
OLED. Examples of such strings are “Button 2 Released” and “Button 1 Pushed”.
The main task also sends the info about the pushed buttons to the
led_queue such that the corresponding LED will be lit. See the
figure below for the UML diagram of the main task.
Figure 1. Main Task
