serialRead

Read data from a serial port for arduino.

Plugin opcode in serial.

Syntax

kByte serialRead iPort

Performance

iPort -- port number optained from a serialBegin opcode.

kByte -- a byte of data to read.

Examples

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

<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 serialRead.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

non-MIDI Devices

Credits

Author: Matt Ingalls
2011

New in version 5.14