Run a program while monitoring for a button to stop it

[RitchieP]

So I have a main program that mimics the SPIKE hub menu where I get to choose different programs based on numbers.

But the problem now is, after I run a program (say program 1), I can't stop program 1 only. I'll have to stop the entire program.

What I'm looking to achieve is, if I run program 1, I want to have the ability to press a button (say center button), that only stops program 1, and I'm now able to select other program numbers without stopping the whole program.

My main program look something like this.

while True:

    if Button.LEFT in hub.buttons.pressed():
        if program > 0:
            program -= 1
        elif program == 0:
            program = 9
        wait(200)

    elif Button.RIGHT in hub.buttons.pressed():
        if program < 9:
            program += 1
        elif program == 9:
            program = 0
        wait(200)

    elif Button.CENTER in hub.buttons.pressed():
        wait(100)
        # add your route here
        if program == 0:
            program0()
        elif CURRENT_ROUTE == 1:
            program1()

What would be the best way to implement this?

[techcatgato]

try: program1() except SystemExit: program_selector()

[RitchieP]

Wow! That's a really good trick. But I would imagine that I would not be able to actually stop the whole program when I'm done.

I'll have a look into it!

[techcatgato]

Well I dont have a solution for that, but from what i understand you will want to exit the program less frequently, and then you can just restart the hub

[RitchieP]

Hey! It actually did work! I just have to wrap the program selection in the exception handling structure like below.

while True:

    if Button.LEFT in hub.buttons.pressed():
        if program > 0:
            program -= 1
        elif program == 0:
            program = 9
        wait(200)

    elif Button.RIGHT in hub.buttons.pressed():
        if program < 9:
            program += 1
        elif program == 9:
            program = 0
        wait(200)

    elif Button.CENTER in hub.buttons.pressed():
        wait(100)
        # add your route here
        if program == 0:
            try:
                program0()
            except SystemExit:
                # Just make sure to stop whatever motor that is moving
                continue
        elif CURRENT_ROUTE == 1:
            try:
                program1()
            except SystemExit:
                continue