serial-port - void serialEvent Arduino - 处理以避免滞后

Question

我在将数据从 Arduino 发送到 Processing 时遇到问题。我可以在绘图循环中正常接收数据，但它非常慢，所以我包含了一个 serialEvent() 函数来尝试消除一些延迟，但现在它似乎没有在 serialEvent 函数中读取数据，我不明白为什么!

import themidibus.*;
import processing.serial.*;

int end = 10;
String serial;
Serial port;
MidiBus myBus;

// Incoming data
int c;
int d;
int e;
int f;
int g;
int a;
int b;
int C;
int pitchPot;
int tonalityPot;
int noteVol;
int pan;
int reverb;
int dlay;
int distort;
int octave;

// Ellipse parameters
int noteOn = 0;
int col1 = 0;
int col2 = 0;
int col3 = 0;

int passTime;
int saveTime;
int expand = 0;
String[] A = new String[18];
String[] B = new String[18];

boolean cPress = false;
boolean dPress = false;
boolean ePress = false;
boolean fPress = false;
boolean gPress = false;
boolean aPress = false;
boolean bPress = false;
boolean CPress = false;

void setup() {
  size(600, 600, P3D);
  frameRate(10);
  smooth();
  port = new Serial(this, Serial.list()[6], 115200);
  port.clear();
  serial = port.readStringUntil(end);
  serial = null; // Initially, the string will be null (empty)
  myBus = new MidiBus(this, -1, "Java Sound Synthesizer");
}

void draw() {

  if ((c == 1) && (cPress == false)) {
    col1 = 255;
    col2 = 0;
    col3 = 0;
    myBus.sendControllerChange(1, 10, pan);
    myBus.sendNoteOn(1, (60 + pitchPot + octave), noteVol);
    cPress = true;
  }

  if ((c == 0) && (cPress == true)) {
    myBus.sendNoteOff(1, (60 + pitchPot + octave), noteVol);
    cPress = false;
  }
  // D

  if ((d == 1) && (dPress == false)) {
    col1 = 0;
    col2 = 0;
    col3 = 255;
    myBus.sendControllerChange(1, 10, pan);
    myBus.sendNoteOn(1, (62 + pitchPot + octave), noteVol);
    dPress = true;
  }

  if ((d == 0) && (dPress == true)) {
    myBus.sendNoteOff(1, (62 + pitchPot + octave), noteVol);
    dPress = false;
  }

  if ((e == 1) && (ePress == false)){
    col1 = 0;
    col2 = 255;
    col3 = 0;
    myBus.sendControllerChange(1, 10, pan);
    myBus.sendNoteOn(1, (64 + pitchPot + tonalityPot  + octave), noteVol);
    ePress = true;
  }

  if ((e == 0) && (ePress == true)){
    myBus.sendNoteOff(1, (64 + pitchPot  + tonalityPot + octave), noteVol);
    ePress = false;
  }

  if ((f == 1) && (fPress == false)) {
    col1 = 255;
    col2 = 0;
    col3 = 255;
    myBus.sendControllerChange(1, 10, pan);
    myBus.sendNoteOn(1, (65 + pitchPot + octave), noteVol);
    fPress = true;
  }

  if ((f == 0) && (fPress == true)) {
    myBus.sendNoteOff(1, (65 + pitchPot + octave), noteVol);
    fPress = false;
  }

  if ((g == 1) && (gPress == false)) {
    col1 = 255;
    col2 = 255;
    col3 = 0;
    myBus.sendControllerChange(1, 10, pan);
    myBus.sendNoteOn(1, (67 + pitchPot + octave), noteVol);
    gPress = true;
  }

  if ((g == 0) && (gPress == true)) {
    myBus.sendNoteOff(1, (67 + pitchPot + octave), noteVol);
    gPress = false;
  }

  if ((a == 1) && (aPress == false)) {
    col1 = 0;
    col2 = 255;
    col3 = 255;
    myBus.sendControllerChange(1, 10, pan);
    myBus.sendNoteOn(1, (69 + pitchPot + tonalityPot  + octave), noteVol);
    aPress = true;
  }

  if ((a == 0) && (aPress == true)) {
    myBus.sendNoteOff(1, (69 + pitchPot + tonalityPot  + octave), noteVol);
    aPress = false;
  }

  if ((b == 1) && (bPress == false)) {
    col1 = 50;
    col2 = 250;
    col3 = 130;
    myBus.sendControllerChange(1, 10, pan);
    myBus.sendNoteOn(1, (71 + pitchPot + octave), noteVol);
    bPress = true;
  }

  if ((b == 0) && (bPress == true)) {
    myBus.sendNoteOff(1, (71 + pitchPot + octave), noteVol);
    bPress = false;
  }

  if ((C == 1) && (CPress == false)) {
    col1 = 200;
    col2 = 90;
    col3 = 75;
    myBus.sendControllerChange(1, 10, pan);
    myBus.sendNoteOn(1, (72 + pitchPot + octave), noteVol);
    CPress = true;
  }

  if ((C == 0) && (CPress == true)) {
    myBus.sendNoteOff(1, (72 + pitchPot + octave), noteVol);
    CPress = false;
  }

  if(c == 1 || d == 1 || e == 1 || f == 1 ||
     g == 1 || a == 1 || b == 1 || C == 1) {
    noteOn = 1;
  }
  else {
    noteOn = 0;
  }

  if (dlay == 1) {
    if (noteOn == 1) {
      passTime = millis() - saveTime;
      if (passTime > 1) {
        expand += 15;
         saveTime = millis();
      }
      strokeWeight(10);
      stroke(col1, col2, col3);
      noFill();
      ellipse((300+pan), 300 , expand, expand);
  }
  else {
    expand = noteVol*2;
    noteOn = 0;
  }

  fill(0, 0, 0, 100);
  rect(0, 0, 600, 600);
  fill(col1, col2, col3);
  lights();
  pushMatrix();
  translate(300+pan, 300);
  noStroke();
  sphere(noteOn*noteVol);
  popMatrix();
}
else if (reverb == 1) {
  fill(0, 0, 0, 100);
  rect(0, 0, 600, 600);
  fill(col1, col2, col3);
  lights();
  pushMatrix();
  translate(300, 300);
  rotate(frameCount / 50.0);
  star(0, 0, (noteOn*noteVol* 20), ((noteOn*noteVol)/20), 40);
  popMatrix();
}
else {
  fill(0, 0, 0, 100);
    rect(0,0, 600,600);
    fill(col1,col2, col3);
    lights();
    pushMatrix();
    translate(300+pan, 300);
    noStroke();
    sphere(noteOn*noteVol);
    popMatrix();
  }
}

void serialEvent(Serial port) {

  while (port.available() > 0) {
    serial = port.readStringUntil(end);
  }

  if (serial != null) {

    A = split(serial, ',');
    B = trim(A);
    c = Integer.parseInt(B[1]);
    d = Integer.parseInt(B[1]);
    e = Integer.parseInt(B[2]);
    f = Integer.parseInt(B[3]);
    g = Integer.parseInt(B[4]);
    a = Integer.parseInt(B[5]);
    b = Integer.parseInt(B[6]);
    C = Integer.parseInt(B[7]);

    pitchPot = Integer.parseInt(B[9]);
    tonalityPot = Integer.parseInt(B[10]);
    noteVol = Integer.parseInt(B[11]);
    pan = Integer.parseInt(B[12]);
    dlay = Integer.parseInt(B[13]);
    reverb = Integer.parseInt(B[14]);
    distort = Integer.parseInt(B[15]);
    octave = Integer.parseInt(B[16]);
  }
}

Answer 1

serialEvent() 似乎不像文档中所说的那样被串行事件调用，至少在我使用的 Arduino 平台上是这样。它可能对某些人有效。如果它不起作用，请尝试在主循环中调用 serialEvent。我认为无论如何这都是等效的，因为串行数据确实没有中断。您只需要阅读它，它的想法是 serialEvent 函数将在每个循环中被调用，但它似乎不是那样工作的。

SerialEvent Arduino 文档说:“注意:目前，serialEvent() 与 Esplora、Leonardo 或 Micro 不兼容”，但我怀疑该列表应该更长。