Simulator needs some way of discovering what sensors are connected about pxt-ev3 HOT 15 CLOSED

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Looks like we should mock this line

let conns = analogMM.slice(AnalogOff.InConn, DAL.NUM_INPUTS)

When an device api gets called, it should register itself in the InConn array so that it becomes visible to the simulator. This might need to be an Async operation where you have to wait that the device gets detected on first use.

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I'll keep digging, but Peli like I said, in order for that method (analogMM.slice) to return the list of connected devices it needs to know the list in advance, and there's a dependency on any functional API, like a colorSensor.color to know that there is a color sensor connected on port X, otherwise it won't call the VM. and in turn won't call the sim methods (that could potentially indicate to us that theres a color sensor on port X)

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I guess we can always return a CONN_INPUT_UART. Except touch is not uart, so donno how we'll detect that.

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When the code calls “colorSensor.color”, it registers the device state and returns the default value. Later on the device gets polled and UartSensor picks up the value.
So it might be that the first read returns the default value.

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Figured it out. Added a method in the cpp (motorUsed and sensorUsed) and in the constructor of every Sensor and Motor I call markUsed.
markUsed is in turn implemented in the simulator and is a NOP in the cpp. Seems to work :)

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How do you handle collisions?

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Not sure yet. but we'll need to figure out some clever way to do so. At least we now have all the information.

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Yeah, although unlikely, the common scenario is to use event handlers and different ports. All the logic is in the sim, so we can certainly have a timestamp associated with registration and perhaps have a "smarter" way to tell which of two colliding inputs / outputs to discard.

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Okay. Can do.

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This is all in sim, so perhaps we can even handle it in some nice way. Pop up a message or something.

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Yup! thanks!

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