求助：自定义通信协议不懂，求大神帮忙
import processing.serial.*;Serial port;
public static final char HEADER = 'h';
public static final short LF = 10;
float vol;
float offset = 100;
float scaleVal = 35;
float angleInc = PI/60;
float angle = 0;
float dx = 0;
float under;
float high = 200;
//String[] com;
//String[] data;
void setup()
{
//println(Serial.list());
//com = Serial.list();
port = new Serial(this,"com3",9600);
port.bufferUntil('\n');
size(600,200);
noStroke();
frameRate(60);
}
void draw()
{
scaleVal = map(vol,under,high,0,90);
print(scaleVal);
background(204);
fill(255,0,0);
rect(20,20,20,20);
fill(0);
for (int posx=0;posx<=width;posx++)
{
float posy = offset+sin(angle-dx)*scaleVal;
rect(posx,posy,1,1);
angle+=angleInc;
}
dx+=0.05;
angle = 0;
}
void serialEvent(Serial port)
{
String message = port.readStringUntil(LF);
if (message != null)
{
//print(message);
String [] data = message.split(",");
//println(data.charAt(0));
if (data.charAt(0) == HEADER)
{
print("hello");
if(data.length >1)
{
vol = Integer.parseInt(data);
print(vol);
if (high < vol)
{
vol = high;
}
if (under > vol)
{
vol = under;
}
}
}
}
}
void mouseClicked()
{
if (mouseX<40&&mouseX>20)
{
if (mouseY<40&&mouseY>20)
{
under = vol;
}
}
}
碰到的问题：h是自定义的起始位置，那为什么接收到的数据会有h呢？
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