[AccelStepper][PlatformIO][mbed] 请求''中的成员''，它是非类类型

Question

所以我一直在尝试创建 3 个“accelstepper”对象。 This is a screenshot of my code in case the code section doesn't appear。另外，this is a screenshot of the file "stepper_directory.h"

#include <mbed.h>
#include "stepper_directory.h"

//Include accelstepper library
#include <AccelStepper.h>

//Create accelstepper object for the Z-Axis actuator
AccelStepper zaxis(uint8_t interface = AccelStepper::DRIVER, uint8_t zstep = ZSTEP, uint8_t zdir = ZDIR);

//Create accelstepper object for the theta axis actuator
AccelStepper taxis(uint8_t interface = AccelStepper::DRIVER, uint8_t tstep = TSTEP, uint8_t tdir = TDIR);

//Create accelstepper object for the magnet actuator
AccelStepper maxis(uint8_t interface = AccelStepper::DRIVER, uint8_t mstep = MSTEP, uint8_t mdir = MDIR);

这是我用过的头文件“stepper_directory.h”

#ifndef _STEPPER_DIRECTORY
#define  _STEPPER_DIRECTORY

#include "PinNames.h"

//Pin Definitions
#define ZSTEP   PA_7
#define ZDIR    PA_0

#define TSTEP   PA_8
#define TDIR    PA_1

#define MSTEP   PA_9
#define MDIR    PA_2

我尝试在 main.cpp 的主代码中设置一个步进器，如下所示：

int main() {
    // put your setup code here, to run once:
    zaxis.setMaxSpeed(188000);

    while(1) {
    // put your main code here, to run repeatedly:
    }
}

但是 platformIO 编译器抛出了这行代码：

src\main.cpp: In function 'int main()':
src\main.cpp:17:7: error: request for member 'setMaxSpeed' in 'zaxis', which is of non-class type 'AccelStepper(uint8_t, uint8_t, uint8_t)
{aka AccelStepper(unsigned char, unsigned char, unsigned char)}'
 zaxis.setMaxSpeed(188000);
       ^~~~~~~~~~~
*** [.pio\build\nucleo_f410rb\src\main.o] Error 1

我一直试图搜索我的对象实例化有什么问题，但无济于事。如果有人能解释这有什么问题，我将不胜感激。 This is a screenshot of the error in question

Answer 1

问题就在这里。

//Create accelstepper object for the Z-Axis actuator
AccelStepper zaxis(uint8_t interface = AccelStepper::DRIVER, uint8_t zstep = ZSTEP, uint8_t zdir = ZDIR);

这是一个函数声明。它接受三个参数并返回AccelStepper。您不能使用这行代码初始化AccelStepper 的实例。

我假设AccelStepper 的构造函数是这样的：

AccelStepper AccelStepper(uint8_t interface, uint8_t zstep, uint8_t zdir);

你可以这样初始化你的实例：

AccelStepper zaxis(AccelStepper::DRIVER, ZSTEP, ZDIR);