Array passed to constructor reads as integer

Projects Programming
1

Hello,

I'm trying to create a custom Stepper Motor class.

Here's the .h:

#ifndef MyStepper_h
#define MyStepper_h

#include "Arduino.h"

class MyStepper
{
 private:
 int* _pins[4];
 void CommitStep();
 public:
 MyStepper(int pins[4]);
 MyStepper();
 void Step(int steps);
};

#endif

Here's the cpp for the constructor:

#include "MyStepper.h"

MyStepper::MyStepper(int pins[4])
{
 this->_pins=pins;
 pinMode(_pins[0], OUTPUT);
 pinMode(_pins[1], OUTPUT);
 pinMode(_pins[2], OUTPUT);
 pinMode(_pins[3], OUTPUT);
}

and the arduino code:

#include <MyStepper.h>

int stepperPins[4] = {8,9,10,11};

MyStepper myStepper(stepperPins);

EDIT: both loop and setup are empty, just want to create this object succesfuly

yet I get this problem:

C:\Users\User\Documents\Arduino\libraries\MyStepper\MyStepper.cpp: In constructor 'MyStepper::MyStepper(int*, bool, int)':

C:\Users\User\Documents\Arduino\libraries\MyStepper\MyStepper.cpp:25:13: error: incompatible types in assignment of 'int*' to 'int* [4]'

  this->_pins=pins;

             ^

I don't understand. I'm passing an array of size 4, why does it get it as just an int?

Thanks.

2

int* _pins[4];An array of four pointers to int.

3

AWOL:
int* _pins[4];An array of four pointers to int.

Still don't get it.
Tried to change in the arduino code to:

MyStepper myStepper(stepperPins[4]);

and in the cpp& header to:

MyStepper::MyStepper(int* pins[4])

Edit:
with no success

C:\Users\User\Documents\Arduino\libraries\MyStepper\MyStepper.cpp: In constructor 'MyStepper::MyStepper(int**, bool, int)':

C:\Users\User\Documents\Arduino\libraries\MyStepper\MyStepper.cpp:25:13: error: incompatible types in assignment of 'int**' to 'int* [4]'

  this->_pins=pins;

             ^
4

MyStepper myStepper(stepperPins[4],true,0);What you're trying to do there is pass the fifth element of a four element array.

Put the class code aside, and get comfortable with arrays and pointers.

Hint: the name of an array is a pointer to its first element, and the first element has an index of zero.

5

kostor:
Still don't get it.

What useful purpose does stepperPins serve?

6

Indication for which digital pins are used to send signals to the stepper motor from the arduino uno unit.

7

A great answer for the four values stored in the array stepperPins. But I did not ask about the values stored in the array. I asked about the array itself.

Another way to word the question: Why are you storing the four pin numbers in an array?

8

AWOL:
MyStepper myStepper(stepperPins[4],true,0);What you're trying to do there is pass the fifth element of a four element array.

Put the class code aside, and get comfortable with arrays and pointers.

Hint: the name of an array is a pointer to its first element, and the first element has an index of zero.

At first I was somewhat upset with you. But then I did what you told me to, I re-read the array
guide on cplusplus and changed what it took and it works again now.
So thank you. Really.

So if I ever decide to change it (and I might need to, it's apart of a bigger project), I know where to access it. I also don't want to use 4 integers for code visibility reasons.
But it works now. Thanks for making time for me!