SdFat Object as a protected member of the class


I am trying to use a SdFat object as a protected or private class member, which I had working previously, but the SdFat library has not updated that I can tell since my last successful implementation of this firmware.

Previously, I would just pass the SdFat reference to the constructor my myClass and set the member of the class equal to the SdFat reference, and this would work no issues.



#ifndef myClass_h
#define myClass_h
#include "Particle.h"
#include "SdFat.h"

class myClass
         SdFat &_sdCard;
         uint8_t _chipSelect;
         // many class methods are here to be called from inside the class
         myClass(SdFat &sdFat, const uint8_t cs) : _sdCard(sdFat), _chipSelect(cs) {};



#include <SPI.h>
#include "SdFat.h"
#include "Particle.h"
#include "myClass.h"


void setup()
    if (!sdCard.begin(chipSelect, SPI_FULL_SPEED))
        Serial.println("Failed to initialize sd card");
    myClass myClassObject(sdCard, chipSelect);

Expectations v. Reality


This has previously worked for me, but now I see an error from SdFat that the = operator is no longer supported? Hence this constructor notation I am using, I found this inspecting one of @rickkas7 libraries where he used an SdFat object inside of a class right here. This functionality is what I would like to achieve


This code results in a hard fault every time I call a method on the SdCard object, and I am almost certain this is because of the Calling an invalid pointer scenario.

Any help would be appreciated, thanks!

I’d guess that it’s the change in compiler version caused by using a newer Device OS target version that’s causing the error.

One possible solution that comes to mind is switching to passing the SdFat object as a pointer (SdFat *) instead of a reference (SdFat &). Copying the reference should not call the copy operator, so that seems like it should have worked, but apparently not.

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