Question

我写了一些代码来使用Arduino Uno板驱动外部7段显示。当在Arduino IDE中作为.ino文件运行时，它工作得很好。然后我决定将它变成一个库以供将来使用。我创建了我的.h和.cpp文件，但是当我尝试使用之前工作的相同函数为.ino时，它们现在无法工作。这是我的代码：

.ino

#include <Segment.h>

Segment seg;

void setup() {
}

void loop() {
  seg.display(1);
}

·H

#ifndef Segment_h
#define Segment_h
#include "Arduino.h"

class Segment
{
  public:
    Segment();
    void display(int i);
  private:
    int a;
    int b;
    int c;
    int d;
    int e;
    int f;
    int g;
    int dot;
};
#endif

的.cpp

#include "Segment.h"

  const int a=6;
  const int b=7;
  const int c=8;
  const int d=10;
  const int e=11;
  const int f=13;
  const int g=12;
  const int dot=9;

Segment::Segment()
{
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(dot, OUTPUT);
}

void Segment::display(int i)
{
  if (i==0){
    digitalWrite(a, LOW);   
    digitalWrite(b, LOW);
    digitalWrite(c, LOW);
    digitalWrite(d, LOW);
    digitalWrite(e, LOW);   
    digitalWrite(f, LOW);
    digitalWrite(g, HIGH);
    digitalWrite(dot, HIGH);
  }  

  else if (i==1){
    digitalWrite(a, HIGH);   
    digitalWrite(b, LOW);
    digitalWrite(c, LOW);
    digitalWrite(d, HIGH);
    digitalWrite(e, HIGH);   
    digitalWrite(f, HIGH);
    digitalWrite(g, HIGH);
    digitalWrite(dot, HIGH);
  }

  else if (i==2){
    digitalWrite(a, LOW);   
    digitalWrite(b, LOW);
    digitalWrite(c, HIGH);
    digitalWrite(d, LOW);
    digitalWrite(e, LOW);   
    digitalWrite(f, HIGH);
    digitalWrite(g, LOW);
    digitalWrite(dot, HIGH);
  }

  else if (i==3){
    digitalWrite(a, LOW);   
    digitalWrite(b, LOW);
    digitalWrite(c, LOW);
    digitalWrite(d, LOW);
    digitalWrite(e, HIGH);   
    digitalWrite(f, HIGH);
    digitalWrite(g,LOW);
    digitalWrite(dot, HIGH);
}
  else if (i==4){
    digitalWrite(a, HIGH);   
    digitalWrite(b, LOW);
    digitalWrite(c, LOW);
    digitalWrite(d, HIGH);
    digitalWrite(e, HIGH);   
    digitalWrite(f, LOW);
    digitalWrite(g, LOW);
    digitalWrite(dot, HIGH);
  } 
  else if (i==5){
    digitalWrite(a, LOW);   
    digitalWrite(b, HIGH);
    digitalWrite(c, LOW);
    digitalWrite(d, LOW);
    digitalWrite(e, HIGH);   
    digitalWrite(f, LOW);
    digitalWrite(g, LOW);
    digitalWrite(dot, HIGH);
  }
  else if (i==6){
    digitalWrite(a, LOW);   
    digitalWrite(b, HIGH);
    digitalWrite(c, LOW);
    digitalWrite(d, LOW);
    digitalWrite(e, LOW);   
    digitalWrite(f, LOW);
    digitalWrite(g, LOW);
    digitalWrite(dot, HIGH);
  }
  else if (i==7){
    digitalWrite(a, LOW);   
    digitalWrite(b, LOW);
    digitalWrite(c, LOW);
    digitalWrite(d, HIGH);
    digitalWrite(e, HIGH);   
    digitalWrite(f, HIGH);
    digitalWrite(g, HIGH);
    digitalWrite(dot, HIGH);
  }
  else if (i==8){
    digitalWrite(a, LOW);   
    digitalWrite(b, LOW);
    digitalWrite(c, LOW);
    digitalWrite(d, LOW);
    digitalWrite(e, LOW);   
    digitalWrite(f, LOW);
    digitalWrite(g, LOW);
    digitalWrite(dot, HIGH);
  }
  else if (i==9){
    digitalWrite(a, LOW);   
    digitalWrite(b, LOW);
    digitalWrite(c, LOW);
    digitalWrite(d, HIGH);
    digitalWrite(e, HIGH);   
    digitalWrite(f, LOW);
    digitalWrite(g, LOW);
    digitalWrite(dot, HIGH);
    }

  else if (i==10){
    digitalWrite(a, HIGH);   
    digitalWrite(b, HIGH);
    digitalWrite(c, HIGH);
    digitalWrite(d, HIGH);
    digitalWrite(e, HIGH);   
    digitalWrite(f, HIGH);
    digitalWrite(g, HIGH);
    digitalWrite(dot, LOW);
  }

  else if (i==11){
    digitalWrite(a, HIGH);   
    digitalWrite(b, HIGH);
    digitalWrite(c, HIGH);
    digitalWrite(d, HIGH);
    digitalWrite(e, HIGH);   
    digitalWrite(f, HIGH);
    digitalWrite(g, HIGH);
    digitalWrite(dot, HIGH);
  }
}

编译器没有错误，但SSD只是空白。我在名为int test()的.cpp文件中运行了一个测试函数，它只返回一个任意数字，并且运行正常。这让我觉得包含正在按预期工作，并且所有三个文件都在进行通信。我认为由于某种原因，由于某种原因，它无法识别#include "Arduino.h"，这会导致digitalWrite()和pinMode函数被删除。任何人都可以为我阐明这一点吗？感谢。

Answer 1

正如Brian在他的评论中指出的那样，你将Segment类中定义的变量a，b，c，d，e，f，g和dot作为私有成员，并将它们重新定义为全局常量。在Segments成员函数中调用pinMode（）和digitalWrite（）时，函数使用尚未初始化的类成员变量，而不是您初始化的全局变量。

在Segment构造函数中，在调用pinMode（）之前，初始化成员变量。

库编译，但不会运行

1 个答案: