c - 在Processing/Arduino中使用延迟功能时出现高延迟

Question

当我使用延迟功能时

  if(rpm > (rpm_max - 50))
{
arduino.analogWrite(r,255);
arduino.analogWrite(g,0);
arduino.analogWrite(b,0);
delay(15);
arduino.analogWrite(r,0);
arduino.analogWrite(g,0);
arduino.analogWrite(b,0);
delay(15);
arduino.analogWrite(r,255);
arduino.analogWrite(g,0);
arduino.analogWrite(b,0);
delay(15);

}

它落后了我的代码很多。我无法读取下一个转速值来更新我的 LED。如何在不停止我的整个代码的情况下让红色 LED 闪烁？我无法使用线程，因为 arduino 不允许。

import controlP5.*;
import hypermedia.net.*;
import processing.serial.*;
import cc.arduino.*;

Arduino arduino;
int arduinoPos = 0;
int g = 11;
int r = 10;
int b = 9;
ControlP5 cp5;
UDP udpRX;

String ip="127.0.0.1";
int portRX=20777;

int pos;

void setup(){
  size(280,280);
  background(255);

  // Arduino connection and Servo output
  arduino = new Arduino(this, Arduino.list()[1], 115200);  // Your offset may vary
  //println(Arduino.list());
  arduino.pinMode(r,Arduino.OUTPUT);
  arduino.pinMode(g,Arduino.OUTPUT);
  arduino.pinMode(b,Arduino.OUTPUT);


  // Create new object for receiving 
  udpRX=new UDP(this,portRX,ip);
  udpRX.log(false);
  udpRX.listen(true);
}


void draw(){

}

void receive(byte[] data){

  // Function to output all the game data received
  fullOutput(data);


  // Time elapsed since game start
  pos = 0;
  float tTime = Float.intBitsToFloat((data[pos] & 0xff) | ((data[pos+1] & 0xff) << 8) | ((data[pos+2] & 0xff) << 16) | ((data[pos+3] & 0xff) << 24));

  // Lap time
  pos = 4;
  float lapTime = Float.intBitsToFloat((data[pos] & 0xff) | ((data[pos+1] & 0xff) << 8) | ((data[pos+2] & 0xff) << 16) | ((data[pos+3] & 0xff) << 24));

  // Speed, *3.6 for Km/h
  pos = 28;
  float speed = Float.intBitsToFloat((data[pos] & 0xff) | ((data[pos+1] & 0xff) << 8) | ((data[pos+2] & 0xff) << 16) | ((data[pos+3] & 0xff) << 24))*3.6;

  // Gear, neutral = 0
  pos = 132;
  float gear = Float.intBitsToFloat((data[pos] & 0xff) | ((data[pos+1] & 0xff) << 8) | ((data[pos+2] & 0xff) << 16) | ((data[pos+3] & 0xff) << 24));

  // Current lap, starts at 0
  pos = 144;
  float cLap = Float.intBitsToFloat((data[pos] & 0xff) | ((data[pos+1] & 0xff) << 8) | ((data[pos+2] & 0xff) << 16) | ((data[pos+3] & 0xff) << 24));

  // RPM, requires *10 for realistic values
  pos = 148;
  float rpm = Float.intBitsToFloat((data[pos] & 0xff) | ((data[pos+1] & 0xff) << 8) | ((data[pos+2] & 0xff) << 16) | ((data[pos+3] & 0xff) << 24))*10;

  pos = 252;
  float rpm_max = Float.intBitsToFloat((data[pos] & 0xff) | ((data[pos+1] & 0xff) << 8) | ((data[pos+2] & 0xff) << 16) | ((data[pos+3] & 0xff) << 24))*10;

  // Debug the received values
  gameDataOutput(tTime, lapTime, speed, gear, cLap, rpm,rpm_max);

  // Send the speed to the Servo
 // arduinoPos = (int)map(speed, 0, 350, 1, 180); // Note that I've set the max speed to 350, you might have to change this for other games
  //arduino.servoWrite(9, 180-arduinoPos);

   // arduino.analogWrite(r,255);
    //arduino.analogWrite(g,255);
   // arduino.analogWrite(b,255);

    arduino.digitalWrite(13,Arduino.HIGH);
  //ligar arduino firmdata analog simple
  if(rpm > (rpm_max - 50))
  {
    arduino.analogWrite(r,255);
    arduino.analogWrite(g,0);
    arduino.analogWrite(b,0);
    delay(15);
    arduino.analogWrite(r,0);
    arduino.analogWrite(g,0);
    arduino.analogWrite(b,0);
    delay(15);
    arduino.analogWrite(r,255);
    arduino.analogWrite(g,0);
    arduino.analogWrite(b,0);
    delay(15);

  }
  else if(rpm > (rpm_max - 2000) && (rpm < (rpm_max - 50)))
  {
    arduino.analogWrite(r,0);
    arduino.analogWrite(g,0);
    arduino.analogWrite(b,255);

  }
  else if(rpm > (rpm_max - 3000) && (rpm < (rpm_max - 2000)))
  {
    arduino.analogWrite(r,0);
    arduino.analogWrite(g,255);
    arduino.analogWrite(b,0);

  }
    else if(rpm  < (rpm_max - 3000))
  {
    arduino.analogWrite(r,0);
    arduino.analogWrite(g,0);
    arduino.analogWrite(b,0);

  }
}

void gameDataOutput(float tTime, float lapTime, float speed, float gear, float cLap, float rpm,float rpm_max){
  println("Total time: " + tTime);
  println("Lap time: " + lapTime);
  println("Speed: " + speed);
  println("Gear: " + gear);
  println("Current lap: " + cLap);
  println("RPM: " + rpm);
  println("RPM_MAX: " + rpm_max);
}

// Function that outputs all the received game data
void fullOutput(byte[] data){

  // Loop all the received bytes
  for(int i=0; i <= data.length-1; i++){

    // Values consist of 4 bytes
    if(i % 4 == 0){

      // Combine 4 bytes to the value
      float val = Float.intBitsToFloat((data[i] & 0xff) | ((data[i+1] & 0xff) << 8) | ((data[i+2] & 0xff) << 16) | ((data[i+3] & 0xff) << 24));

      // Output the 'raw' value
      println("Value received at position " + i + " = " + val);

    }
  }
}

Answer 1

要在 Arduino 上有效地执行多任务，您需要重新编写应用程序以利用中断。中断是事件，通常是定时器或 Arduino 上的引脚变化，处理器通过启动特殊中断服务例程 (ISR) 来响应。为了让您的应用程序按您的预期工作，您应该让主应用程序代码在loop() 中运行，并有一个附加到定时器中断的ISR 以使LED 闪烁。由于中断仅在计时器事件触发时运行，因此您的主应用程序可以毫无延迟地自由运行。

中断可能是一个很难学习的概念，但它们非常强大。 This可能有用。

或者，不要延迟闪烁之间的整个时间，而是允许应用程序运行并跟踪自上次闪烁以来的时间。在循环()的每个循环之后，检查自上次闪烁以来的时间是否超过了截止日期。如果有，请眨眼。否则，继续运行loop()。 This会有用的。