serialBegin

serialBegin — Open a serial port.

Description

Open a serial port for arduino.

Syntax

iPort serialBegin SPortName [, ibaudRate]

Initialization

SPortName -- port name number

ibaudrate -- serial speed, defaulting to 9600 bps.

Examples

Here is an example of the serialBegin opcode. It uses the file serialBegin.csd.

Example 772. Example of the serialBegin opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-n  ;;;no output
;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o serialBegin.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr  = 44100
ksmps = 500 ; the default krate can be too fast for the arduino to handle
nchnls = 2
0dbfs  = 1

instr 1

iPort serialBegin "/dev/cu.usbmodemfa131", 9600			;connect to the arduino with baudrate = 9600

kGain init 16							;read our knob value
kVal serialRead iPort
if (kVal != -1) then
    kGain = kVal/128
endif

aSig in								;get our audio input and get its rms
kRms rms aSig*kGain

kRms = kRms*kRms*255						;scale the rms to a good value for the LED and send it out
serialWrite iPort, (kRms < 255 ? kRms : 255)			;must be in range: 0-255

endin
</CsInstruments>
<CsScore>
f 1 0 1024 10 1 1 1 1 1 1

i 1 0 200
e
</CsScore>
</CsoundSynthesizer>


This is the matching Arduino code :

void setup() {
  // enable serial communication
  Serial.begin(9600);

  // declare pin 9 to be an output:
  pinMode(9, OUTPUT);
}

void loop() {
  // only do something if we received something (this should be at csound's k-rate)
  if (Serial.available()) {
    // set the brightness of LED (connected to pin 9) to our input value
    int brightness = Serial.read();
    analogWrite(9, brightness);

    // while we are here, get our knob value and send it to csound
    int sensorValue = analogRead(A0);
    Serial.write(sensorValue/4); // scale to 1-byte range (0-255)
  }     
}
.....

See Also

serialEnd, serialWrite_i, serialWrite, serialRead, serialPrint, serialFlush.

Credits

Author: Matt Ingalls
2011

New in version 5.14