Confusing behavior of button event

Question

Hi all,
  I am learning the behavior of the mechanical action of the button. I want to implement something like this. I have two buttons START and STOP. Initially, STOP is disabled and START is enabled. Once START pressed, I disable START and enable STOP. After the START pressed, I update the string output every 6 seconds. I have timeout event triggered every 100ms and will terminate the program when STOP pressed. But I found that after START pressed, STOP will be enabled but STOP doesn't response to my mouse click. I try to set STOP as Latch or switch, doesn't work either

Answer 1

Quick analysis:
Use latch action for the booleans, not exotic and most often inappropriate ones such as "switch until released". Once they are latch action, their terminals belong inside their respective event case.
The first inner sequence structure has no function (delete it!) and the other two can be eliminated by using proper data dependencies.
Use a single loop and a single event structure and keep track of the program state in a state variable in a shift register (e.g. an enum). No sequences needed.
There is no need for timeout events, because nothing special happend there (first event structure). So why spin the loop?
An event structure with only a timeout event is pretty useless (second event structure).
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