未在此范围内声明。不管我怎么努力，我都被困住了

Question

这可能很简单，但我现在正把头撞在墙上。我试图将一个简单的程序分割成多个文件，这样我就可以添加到其中了。我在逻辑上把它分成几个部分。如果有人能给我指点我的错误，那就太棒了。

Main.cpp

#include <Arduino.h>
#include "measure.h"
#include "LoRa.h"

void setup()
{
    Serial.begin(9600);  // STart serial for monitoring/debugging
    Serial2.begin(9600); // Start 2nd serial interface for use with EBYTE module
    Serial.println("Starting Reader");
    Serial.println(Transceiver.init()); // This init will set the pinModes for you
    Transceiver.PrintParameters();      // Display parameters of EBYTE (Can be changed. See example sketches)
}
//=================================================================
//======LOOP=======================================================
//=================================================================

void loop()
{
    measure();  // Take measurements
    delay(1000); // For testing. Will not exist in final
}

measure.cpp

// Takes various measurements, updates struct and sends to receiver

#include <Arduino.h>
#include "measure.h"
#include "MyData.h"
#include "LoRa.h"

unsigned long Last;
void measure()
{
    // measure some data and save to the structure
    MyData.Count++;
    MyData.Bits = analogRead(A0);
    MyData.Volts = MyData.Bits * (5.0 / 1024.0);

    // Send struct
    Transceiver.SendStruct(&MyData, sizeof(MyData));
    // Let us know something was sent
    Serial.print("Sending: ");
    Serial.println(MyData.Count);
}

measure.h

#ifndef MEASURE_H
#define MEASURE_H

#include <Arduino.h>
#include "LoRa.h"

void measure();
#endif

LoRa.cpp

// Somewhere to define/declare everything to do with the Ebyte E32 LoRa module
#include <Arduino.h>
#include "EBYTE.h"
#include "LoRa.h"

#define PIN_RX 16 // Serial2 RX (connect this to the EBYTE Tx pin)
#define PIN_TX 17 // Serial2 TX pin (connect this to the EBYTE Rx pin)
#define PIN_M0 4  // D4 on the board (possibly pin 24)
#define PIN_M1 22 // D2 on the board (possibly called pin 22)
#define PIN_AX 21 // D15 on the board (possibly called pin 21)

// create the transceiver object, passing in the serial and pins
EBYTE Transceiver(&Serial2, PIN_M0, PIN_M1, PIN_AX);

LoRa.h

#ifndef LORA_H
#define LORA_H

#include "Arduino.h"

#endif

MyData.h

#ifndef MYDATA_H
#define MYDATA_H

struct DATA
{
  unsigned long Count;
  int Bits;
  float Volts;
  float Temp;
} MyData;

#endif

偏误

src\main.cpp: In function 'void setup()':
src\main.cpp:45:20: error: 'Transceiver' was not declared in this scope
     Serial.println(Transceiver.init()); // This init will set the pinModes for you
                    ^
src\measure.cpp: In function 'void measure()':
src\measure.cpp:18:5: error: 'Transceiver' was not declared in this scope
     Transceiver.SendStruct(&MyData, sizeof(MyData));
     ^
*** [.pio\build\esp32doit-devkit-v1\src\measure.cpp.o] Error 1
*** [.pio\build\esp32doit-devkit-v1\src\main.cpp.o] Error 1

谢谢！！

Answer 1

您正在LoRa.cpp中创建一个LoRa.cpp对象，但它尚未被measure.cpp文件访问。要到达另一个文件中的文件范围中的对象，可以在声明中添加extern：

extern EBYTE Transceiver;

此外，为了让measure.cpp文件了解什么类型的对象收发器(例如，它包含哪些方法)，您应该在measure.cpp中包含EBYTE报头：

#include "EBYTE.h"

一个使用EBYTE码的示例。

例如：

#include <Arduino.h>
#include "EBYTE.h"
#include "measure.h"
#include "MyData.h"
#include "LoRa.h"

unsigned long Last;
extern EBYTE Transceiver;

void measure()
{