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Lab Session 6: Small-scale RT multitasking

Estimated time: 1.5h (1 session)

1. Working with real hardware

Part 1 - Buttons interaction

The M5Core2 device has 3 touch buttons defined as M5.BtnA, M5.BtnB, and M5.BtnC.

  • Compile and test the example program button_example.ino.
  • At this link you can find the documentation about the functions that can be performed with the buttons.

Danger

The documentation in the link before is for the new library M5Unified.h, which is very new and not very well tested. Some of the functions in that documentation where not included in the old M5Core2.h library. Focus only on the functions used in button_example.ino

Question

  • How do the buttons behave?
  • What do the wasReleased and pressedFor functions do?

Part 2 - Secret code

The program will have 4 states:

  • State 0: No button has been pressed.
  • State 1: The first button has been pressed correctly.
  • State 2: The second button has been pressed correctly.
  • State 3: The third button has been pressed correctly.

The buttons must be pressed in the sequence A, B, C.

  • If the correct button is pressed, the program moves to the next state.
  • If an incorrect button is pressed, it returns to State 0.

Note

Each time the state changes, a message should be printed on the screen. For example: - If the program is in State 1: 

   M5.Lcd.println("First button correct");
- If the program is in State 3: 
M5.Lcd.println("CODE CORRECT!");

2. Working in simulation

You can do a similar exercise in sumation.