Serial Control and Multiplexer

b.d · June 14, 2022, 3:00am

Hi all -

I am using this code with an Teensy and 4051 multiplexer to send an 8-item 12-bit serial array.

I am at a total loss for how to receive and read this information in SuperCollider. Has anyone done this that can provide a code example or tutorial?

Thank you.

fmiramar · June 14, 2022, 3:35am

You need to write a small communication protocol to receive serial port messages greater than 8 bits, basically divide the bit stream into “words”. Fredrik Olofsson have some tutorials about this:

github.com

redFrik/udk13-Remote_control/blob/master/udk150604/arduinoToSupercollider_advanced.scd

//--use with arduinoToSupercollider_advanced.ino
//supercollider code for reading six 10bit analog sensors
//protocol: 253 254 nn nn nn nn nn nn nn nn nn nn nn nn 255
//nn comes in pairs. first nn are the upper 8bits and the second are the lower 2 bits. A0 to A5 in order.

SerialPort.listDevices;
s.boot;
Ndef(\arduino, {Splay.ar(SinOsc.ar(\data.kr(0!6).lag(0.02)+500, 0, 0.4))}).play;

(
var port= SerialPort("/dev/tty.usbserial-A101NB76", 115200, crtscts: true);
var num= 6;//number of analog sensors
Routine.run({
	var byte, index= 0, payload= Array.newClear(num*2), data= Array.newClear(num);
	inf.do{
		while({byte= port.read; byte.notNil}, {
			//byte.postln;	//debug
			if(index==0 and:{byte==253}, {//check if first byte is 253
				index= 1;
			}, {

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b.d · June 14, 2022, 5:30am

Thanks, but I might need to start with something a little more rudimentary than this. I’m not sure I understand this idea or what a payload is…
“//protocol: 253 254 nn nn nn nn nn nn nn nn nn nn nn nn 255
//nn comes in pairs. first nn are the upper 8bits and the second are the lower 2 bits. A0 to A5 in order.”