Yeah, that’s it. Cool - thanks Spencer! —ss
[ - ] Scott Smallwood <http://www.scott-smallwood.com/> - Associate Professor - University of Alberta [ - ] > On Apr 18, 2019, at 11:03 PM, Spencer Salazar <spencer.sala...@gmail.com> > wrote: > > 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 > <mailto: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 <http://www.scott-smallwood.com/> - Associate >> Professor - University of Alberta [ - ] >> >> _______________________________________________ >> chuck-users mailing list >> chuck-users@lists.cs.princeton.edu >> <mailto:chuck-users@lists.cs.princeton.edu> >> https://lists.cs.princeton.edu/mailman/listinfo/chuck-users >> <https://lists.cs.princeton.edu/mailman/listinfo/chuck-users> > _______________________________________________ > chuck-users mailing list > chuck-users@lists.cs.princeton.edu > https://lists.cs.princeton.edu/mailman/listinfo/chuck-users
_______________________________________________ chuck-users mailing list chuck-users@lists.cs.princeton.edu https://lists.cs.princeton.edu/mailman/listinfo/chuck-users
