Hey Scott,
Looks solid, but try checking if the ints[] array is null before the loop, or
just put a null check in the loop condition. It shouldn’t normally be null but
wouldn’t be surprised if it is occasionally.
Spencer
> On Apr 18, 2019, at 8:15 PM, Scott Smallwood <ssmal...@ualberta.ca> wrote:
>
> Dear chuckians,
>
> Not sure how many of you have messed with the serial objects - but I’m having
> a bit of a head-scratcher and wondered if anyone had any ideas about this.
>
> I built a little box with one knob and one switch - which I’m planning to use
> as a master volume and mute switch for a multichannel audio installation that
> is running in Chuck.
>
> The Arduino code is really basic:
>
> —
> const int SwitchPin = 12;
> const int VolPin = 0;
>
> void setup()
> {
> //turn on serial communication
> Serial.begin(57600);
>
> //set switch pin and turn on pullup resistor
> pinMode (SwitchPin, INPUT);
> digitalWrite (SwitchPin, HIGH);
> }
>
> void loop()
> {
>
> Serial.print(digitalRead(SwitchPin));
> Serial.print(' ');
> Serial.println(analogRead(VolPin));
> delay(50);
>
> }
> —
>
> OK - so I first built a little Max patch to test it, which works flawlessly
> as far as I can tell.
>
> I then wrote a little chuck script, based partially on one of Spencer’s
> examples. It simply grabs the data and prints it to the console.
>
> It works great for awhile, but after a few minutes, it always crashes with an
> array-out-of-bounds exception:
>
> NullPointerException: (array access) on line[35]
>
> I’m grabbing two ints, and looping through and printing them out. Why is the
> array size suddenly getting mucked up here? It’s intermittent, and
> sometimes doesn’t happen for several minutes, but always results in a crash
> eventually. Any ideas?? (chuck code below)
>
> —
>
> SerialIO.list() @=> string list[];
> SerialIO cereal;
>
> //the name of my arduino box's serial port
> "usbserial-12DP0657" => string port;
>
> //number of serial device
> -1=>int device;
>
> //loop through any ports and find the one with the right name
> for(0=>int i; i < list.cap(); i++)
> {
>
> //check for correct port name
> if (list[i].find(port) != -1)
> {
> //and assign the device number
> i => device;
> }
> else
> -1 => device;
> }
>
> //open the serial port
> cereal.open(device, SerialIO.B57600, SerialIO.ASCII);
>
> //loop through and grab the serial port data
> while(true)
> {
> cereal.onInts(2) => now;
> cereal.getInts() @=> int ints[];
>
> //print out to console
> for(0=>int i; i < ints.cap(); i++) //<- this is where the problem
> seems to happen
> {
> chout <= ints[i] <= " ";
> }
> chout <= IO.newline();
> }
>
>
>
> —ss
>
> [ - ] Scott Smallwood - Associate Professor - University of Alberta [ - ]
>
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