在我的 Arduino 库中使用外部库

Use external library in my Arduino library

本文关键字：外部 Arduino 我的      更新时间：2023-10-16

我想创建一个个人库，在那里我使用另一个。在我的代码中，我在私有部分声明并初始化了库。

但是我有错误'((LCD*)this)->LCD::lcd' does not have class type.

我已经写了几个版本，但没有任何变化。充其量我可以显示print Test01和test02.

.h

#ifndef LCD_h
#define LCD_h
#include <LiquidCrystal_I2C.h>
class LCD{
public:
LCD();
void firstLine();
void secondLine(float tempInCelsius);
private:
LiquidCrystal_I2C lcd(0x27, 16, 2);
};
#endif

。.cpp

#include "LCD.h"
#include <LiquidCrystal_I2C.h>
LCD::LCD(){
Serial.begin(9600);
Serial.println("Test 01");
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
}
void LCD::secondLine(float tempInCelsius){
Serial.println("Test 03");
lcd.clear();
lcd.setCursor(0, 1);
lcd.print("T = ");
lcd.print(tempInCelsius);
}

.ino

#include "LCD.h"

LCD CrystalLCD();
void setup(void)
{
Serial.begin(9600);
Serial.println("Test 02");
}
void loop(void)
{
CrystalLCD.secondLine(1.40);
}

我也会给你整个错误消息。

[Starting] Verify sketch - arduino.ino
Loading configuration...
Initializing packages...
Preparing boards...
Verifying...
In file included from /Users/WorkSpace/Make/RucheChaufante/ino/LCD.cpp:1:0:
LCD.h:13: error: expected identifier before numeric constant
LiquidCrystal_I2C lcd(0x27, 16, 2);
^
LCD.h:13: error: expected ',' or '...' before numeric constant
/Users/WorkSpace/Make/RucheChaufante/ino/arduino.ino: In constructor 'LCD::LCD()':
arduino:9: error: '((LCD*)this)->LCD::lcd' does not have class type
Serial.println("Test 02");
^
arduino:10: error: '((LCD*)this)->LCD::lcd' does not have class type
}
^
arduino:11: error: '((LCD*)this)->LCD::lcd' does not have class type
^
/Users/WorkSpace/Make/RucheChaufante/ino/arduino.ino: In member function 'void LCD::secondLine(float)':
arduino:16: error: '((LCD*)this)->LCD::lcd' does not have class type
arduino:17: error: '((LCD*)this)->LCD::lcd' does not have class type
arduino:18: error: '((LCD*)this)->LCD::lcd' does not have class type
arduino:19: error: '((LCD*)this)->LCD::lcd' does not have class type
/Users/WorkSpace/Make/RucheChaufante/ino/arduino.ino: In function 'void loop()':
arduino:14: error: request for member 'secondLine' in 'CrystalLCD', which is of non-class type 'LCD()'
CrystalLCD.secondLine(1.40);
^
exit status 1
[Error] Exit with code=1

不能初始化类声明中的成员。尝试：

class LCD
{   
public:
LCD();
void firstLine();
void secondLine(float tempInCelsius);
private:
LiquidCrystal_I2C lcd; 
};

但是，您可以在构造函数中初始化此类成员(如果它们不提供默认构造函数，则必须初始化(。尝试：

LCD::LCD() : lcd(0x27, 16, 2) {
Serial.begin(9600);
Serial.println("Test 01");
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
}
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