6

我有一个小问题。

我正在传递来自 arduino 附加的 3 轴加速度计 + 3 轴磁力计 + 指南针航向的信息。这些被缩放到 midi 范围 (0-127)。

ARDUINO:这是在串行打印中传递的,格式为 76a45b120c23d12e23f34g

  Serial.print(shiftAx);
  Serial.print("a");
  Serial.print(shiftAy);
  Serial.print("b");
  Serial.print(shiftAz);
  Serial.print("c");
  Serial.print(shiftMx);
  Serial.print("d");
  Serial.print(shiftMy);
  Serial.print("e");
  Serial.print(shiftMz);
  Serial.print("f");
  Serial.print(shiftHead);
  Serial.print("g");

我可以使用我的串行监视器看到它的工作原理。(但是我不确定是否在“g”处将其打印为 println。)

处理2:

我在我的 void setup() 中缓冲直到 g

port = new Serial(this, "/dev/tty.usbmodem411", 9600);
port.bufferUntil('g'); 

我有这个功能

    void serialEvent (Serial port)
{

  data = port.readStringUntil('g');

  AxVal = data.substring(0, data.indexOf('a'));

  AyVal = data.substring(data.indexOf("a") + 1, data.indexOf("b"));  

  AzVal = data.substring(data.indexOf("b") + 1, data.indexOf("c"));

  MxVal = data.substring(data.indexOf("c") + 1, data.indexOf("d"));

  MyVal = data.substring(data.indexOf("d") + 1, data.indexOf("e"));

  MzVal = data.substring(data.indexOf("e") + 1, data.indexOf("f"));

  HeadVal = data.substring(data.indexOf("f") + 1, data.indexOf("g"));

}

问题所以这不起作用。没有文字显示。(它只是一个简单的填充(),文本())

我不明白为什么。问题是我的协议(如果我可以这么称呼的话),我是如何解包字符串的?或者其他什么问题。

我很迷茫。

我可以让它只使用本教程中的两个值

注意:arduino 主循环处于延迟(100);arduino 的波特率为 9600

如果需要帮助我,我将附上整个草图,我将在此表示感谢。

代码:

加工

import themidibus.*; //Import the library
import javax.sound.midi.MidiMessage; //Import the MidiMessage classes http://java.sun.com/j2se/1.5.0/docs/api/javax/sound/midi/MidiMessage.html
import javax.sound.midi.SysexMessage;
import javax.sound.midi.ShortMessage;
import processing.serial.*;

MidiBus myBus; // The MidiBus

Serial port;

String AxVal = " ", AyVal = " ", AzVal = " ";
String MxVal = " ", MyVal = " ", MzVal = " ";
String HeadVal = " ";
String AxString="Ax",AyString = "Ay",AzString = "Az";
String MxString="Mx",MyString = "My",MzString = "Mz";
String HeadString="Heading";
String data = " ";
PFont font;


int status_byte = 0xB0; //  send control change
  int channel_byte = 0; // On channel 0 
  int first_byte; // cc number;
  int second_byte; // value

void setup()
{
  size(1000,500);
  port = new Serial(this, "/dev/tty.usbmodem411", 9600);
  port.bufferUntil('g'); 
  font = loadFont("NanumBrush-48.vlw");
  textFont(font, 48);

    MidiBus.list(); // List all available Midi devices on STDOUT. This will show each device's index and name.
  myBus = new MidiBus(this, 1, 0); // Create a new MidiBus object

}

void draw()
{
  background(0,0,0);

  //first_byte = 1;
  //second_byte = int(AxVal); // But with less velocity
  //myBus.sendMessage(status_byte, channel_byte, first_byte, second_byte);
  fill(46, 209, 2);
  text(AxVal, 60, 75);
  text(AxString, 60, 125);

  //first_byte = 2;
  //second_byte = int(AyVal); // But with less velocity
  //myBus.sendMessage(status_byte, channel_byte, first_byte, second_byte);
  fill(0, 160, 153);
  text(AyVal, 120, 75);
  text(AyString,120,125);



 // first_byte = 3;
  //second_byte = int(AzVal); // But with less velocity
  //myBus.sendMessage(status_byte, channel_byte, first_byte, second_byte);
  fill(0, 160, 153);
  text(AzVal, 180, 75);
  text(AzString,180,125);

  /*
  first_byte = 4;
  second_byte = int(MxVal); // But with less velocity
  myBus.sendMessage(status_byte, channel_byte, first_byte, second_byte);
  fill(0, 160, 153);
  text(MxVal, 240, 75);
  text(MxString,240,125);

  first_byte = 5;
  second_byte = int(MyVal); // But with less velocity
  myBus.sendMessage(status_byte, channel_byte, first_byte, second_byte);
  fill(0, 160, 153);
  text(MyVal, 300, 75);
  text(MyString,300,125);

  first_byte = 6;
  second_byte = int(MzVal); // But with less velocity
  myBus.sendMessage(status_byte, channel_byte, first_byte, second_byte);
  fill(0, 160, 153);
  text(MzVal, 360, 75);
  text(MzString,360,125);

  first_byte = 7;
  second_byte = int(HeadVal); // But with less velocity
  myBus.sendMessage(status_byte, channel_byte, first_byte, second_byte);
  fill(0, 160, 153);
  text(HeadVal, 420, 75);
  text(HeadString,420,125);

  */

}

void serialEvent (Serial port)
{

  data = port.readStringUntil('g');
  data = data.substring(0, data.length() - 1);

  AxVal = data.substring(0, data.indexOf('a'));


  AyVal = data.substring(data.indexOf("a") + 1, data.indexOf("b"));


  AzVal = data.substring(data.indexOf("b") + 1, data.length());

 /* 
  index = data.indexOf("c")+1;
  MxVal = data.substring(index, data.indexOf("d"));

  index = data.indexOf("d")+1;
  MyVal = data.substring(index, data.indexOf("e"));

  index = data.indexOf("e")+1;
  MzVal = data.substring(index, data.indexOf("f"));

  index = data.indexOf("f")+1;
  HeadVal = data.substring(index, data.indexOf("g"));
  */

}
/*
void serialEvent (Serial port)
{

  data = port.readStringUntil('g');

  AxVal = data.substring(0, data.indexOf('a'));

  AyVal = data.substring(data.indexOf("a") + 1, data.indexOf("b"));  

  AzVal = data.substring(data.indexOf("b") + 1, data.indexOf("c"));

  MxVal = data.substring(data.indexOf("c") + 1, data.indexOf("d"));

  MyVal = data.substring(data.indexOf("d") + 1, data.indexOf("e"));

  MzVal = data.substring(data.indexOf("e") + 1, data.indexOf("f"));

  HeadVal = data.substring(data.indexOf("f") + 1, data.indexOf("g"));

}

阿杜诺:

// Add lastvalue check

#include <Wire.h>
#include <LSM303DLH.h>

LSM303DLH glove;

 //set max min magnetometer
        int maxMx = +353, maxMy = +527, maxMz = 426;
    int minMx = -700, minMy = -477, minMz = -561;

        int maxA = 2019;
    int minAx = -1043, minAy = -2048, minAz = -2048;

        int shiftMx,shiftMy,shiftMz;
        int shiftAx,shiftAy,shiftAz;    
        float shiftHeadTemp;
        int shiftHead;  



void setup()
{
 Wire.begin();
    glove.enableDefault();
   Serial.begin(9600);
}

void loop()
{



 glove.read();


    shiftMx = ((glove.m.x - minMx) / (maxMx - minMx)) * 127;
    shiftMy = ((glove.m.y - minMy) / (maxMy - minMy)) * 127;
    shiftMz = ((glove.m.z - minMz) / (maxMz - minMz)) * 127;

    shiftAx = ((glove.a.x - minAx) / (maxA - minAx)) * 127;
    shiftAy = ((glove.a.y - minAy) / (maxA - minAy)) * 127;
    shiftAz = ((glove.a.z - minAz) / (maxA - minAz)) * 127;

    shiftHeadTemp = (glove.heading((LSM303DLH::vector){0,-1,0}));

    shiftHead =  (shiftHeadTemp/360)*127; 

    if (shiftMx < 0){shiftMx=0;}
    if (shiftMx >127){shiftMx=127;}
    if (shiftMy < 0){shiftMy=0;}
    if (shiftMy >127){shiftMy=127;}
    if (shiftMz < 0){shiftMz=0;}
    if (shiftMz >127){shiftMz=127;}

    if (shiftAx < 0){shiftAx=0;}
    if (shiftAx >127){shiftAx=127;}
    if (shiftAy < 0){shiftAy=0;}
    if (shiftAy >127){shiftAy=127;}
    if (shiftAz < 0){shiftAz=0;}
    if (shiftAz >127){shiftAz=127;}

    if (shiftHead < 0){shiftHead=0;}
    if (shiftHead >127){shiftHead=127;}




  Serial.print(shiftAx);
  Serial.print("a");
  Serial.print(shiftAy);
  Serial.print("b");
  Serial.print(shiftAz);
  Serial.print("c");
  Serial.print(shiftMx);
  Serial.print("d");
  Serial.print(shiftMy);
  Serial.print("e");
  Serial.print(shiftMz);
  Serial.print("f");
  Serial.print(shiftHead);
  Serial.println("g");



  delay(100);


}
4

2 回答 2

7

我现在无法测试您的代码,但这里有一些想法。

您可以将 JSON 从您的 Arduino 发送到处理。这是我在自己的一个项目中使用的示例,但您可以轻松地对其进行调整以满足您的需求:

void sendJson(){
    String json;

    json = "{\"accel\":{\"x\":";
    json = json + getXYZ(0);
    json = json + ",\"y\":";
    json = json + getXYZ(1);
    json = json + ",\"z\":";
    json = json + getXYZ(2);
    json = json + "},\"gyro\":{\"yaw\":";
    json = json + getYPR(0);
    json = json + ",\"pitch\":";
    json = json + getYPR(1);
    json = json + ",\"roll\":";
    json = json + getYPR(2);
    json = json + "}}";

    Serial.println(json);
}

JSON 的好处在于它很容易通过使用该getType()函数进行处理来“解析”。没有更多readUntil,一切都是这样的:(请注意,void setup()您需要更改port.bufferUntil('g');为,port.bufferUntil('\n');因为在 Arduino 中,json是用 发送的Serial.println();

void serialEvent (Serial port){
        String json = port.readString();

        shiftAx = getInt("shiftAx");
        shiftAy = getInt("shiftAy"); // and so on...
}

您将不得不稍微更改您的代码,但从长远来看,它会更易于维护,比如说如果您添加更多传感器。您只需要更改jsonarduino 并简单地获取处理中的值。

另一件事:您可以使用约束函数将您的值限制在0和之间127

value = constrain(value, 0, 127);

希望能帮助到你!

于 2013-08-11T14:12:05.853 回答
0

我在 c# 中遇到了同样的问题(第二个参数,在 c# 中是减法字符串的长度)。但是,我看到如果我不等待一点时间,传输的字符串并不总是相同的形式:这样:某天,你的字符串将是 (value)a(value)b(value)c(value )d(value)e(value)f(value)g ,但其他时间将是: (value)a(value)b(value)c(value)d(value) 并且下一个字符串将是 e(value) f(value)g(value)a(value)b(value) 等等……好吧毕竟所有的数据都会被传输,但不会有相同的结构,所以我加了一点延迟在每次串行读取之前(以确保之前的串行字符串被读取到并且每次我都以相同的形式获得字符串),它对我来说很好。希望对你也有帮助。

于 2013-12-17T14:05:29.807 回答