[AccelStepper][PlatformIO][mbed] Request for member '' in '', which is of non-class type - class

Question

so I have been trying to create 3 'accelstepper' objects.
This is a screenshot of my code in case the code section doesn't appear. Also, 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);
This is the header file i've used "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
I've tried to setup one stepper in my main code in main.cpp as follows:
int main() {
// put your setup code here, to run once:
zaxis.setMaxSpeed(188000);
while(1) {
// put your main code here, to run repeatedly:
}
}
But the platformIO compiler is throwing out this lines:
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
I have been attempting to search for what is wrong with my object instantiations to no avail. I would really appreciate if there someone could explain what is wrong with this. This is a screenshot of the error in question

Answer 1

The problem is here.
//Create accelstepper object for the Z-Axis actuator
AccelStepper zaxis(uint8_t interface = AccelStepper::DRIVER, uint8_t zstep = ZSTEP, uint8_t zdir = ZDIR);
This is a function declaration. It takes three arguments and returns AccelStepper. You cannot initialize an instance of AccelStepper with this line of code.
I assume AccelStepper's constructor is something like this:
AccelStepper AccelStepper(uint8_t interface, uint8_t zstep, uint8_t zdir);
You can initialize your instance this way:
AccelStepper zaxis(AccelStepper::DRIVER, ZSTEP, ZDIR);