When the count exceeds some value it suspends interrupts, does some measurements, sets a control value according analog input, resets the count, increments the count, turns interrupts on again, and waits for the next interrupt. My program uses tone output to pin 2 and interrupt 0 to call a counter function. But since I figured I can't, I simply put nothing in it, left it at the end of the sketch and thereafter ignored it. I wanted to stop the loop() to save processor time. Instead of loop(), pretend the name is: functionThatGetsCalledOverAndOverAgainForever().Instead of setup(), pretend the name is: functionThatGetsCalledOnceAtTheBeginning().Pretend the setup() and loop() functions have different names, and what's going on might make more sense: The reason it loops is that another hidden function is calling it inside it's own loop. It's just a function, and doesn't inherently have anything to do with looping. In this case, it will return to a hidden main function that will immediately loop back and call the loop() function again, from the start of the function.ĭon't let the name of the loop() function confuse you. This will immediately exit the function, and return control to the function that called it. If you want to completely break out of and exit a function, the simplest way is to just use the return statement. ![]() The break statement has no meaning or effect on a function. Placing the "break" statement inside that block of code will terminate the loop, and transfer control to the next statement after the end of the loop.īut the loop() function is not a loop control statement like while and for: it is a function. They are statements that can repeatedly perform a block of code. You call while and for "loop fns" but they aren't functions. I've read the reference and i know that "break" is used to stop the ordinary loop fns like while and for. So, what are you actually trying to accomplish by "stopping" the loop() function? But in fact it's just part of a bigger task, and there might be a better solution rather than the one you are planning. I'm thinking this may be a classic case of wanting to do something, and thinking you have to do something specific, and are asking how to do that one thing. Maybe there's a better way to approach it.Īnd what do you mean by stop? Do you want to break the execution of the current call, so that you can start the loop function over again from the top? Or do you really want to stop the program completely (which is what all of the suggestions so far are doing)? ![]() while(true) void loop() structure instead of a fancy "stop main loop" function.Let's start with WHY you want to stop the loop() function. I won't go in depth be here's a great description of what it is and how to use it.ġst) End void loop() with while(1). The other option would be using one of the built-ins hardware timers to get a function called periodically with interruptions. ![]() Note: This will invert the levels of the button, LOW will be pressed and HIGH will be released. You can read the Arduino reference for more information about this topic, but in a nutshell this configuration sets an internal pullup resistor, this way you can just have your button connected to ground, with no need of external resistors. In this case we're using a button pin as an INPUT_PULLUP. If you want to generate the signal with the input of a button you could do the following int speakerOut = A0 If that's the case, there are several solutions: ![]() Nonetheless, by looking at your code and making several assumptions, I imagine you're trying to output a signal with a given frequency, but you want to be able to stop it. Matti Virkkunen said it right, there's no "decent" way of stopping the loop.
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