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52 lines
1.8 KiB
52 lines
1.8 KiB
/*
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Generic digital pin interface
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Copyright (C) 2020 by Maxim Prokhorov <prokhorov dot max at outlook dot com>
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*/
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#pragma once
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#include <Arduino.h>
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#include <cstdint>
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#include "../config/types.h"
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class BasePin {
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public:
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// TODO: we always need to explicitly call the constructor from the child
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// class, because we need to set the const `pin` member on construction
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// - https://isocpp.org/wiki/faq/multiple-inheritance#virtual-inheritance-ctors
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// TODO: vtable anchoring? same applies to every implemented ..._pin.h
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// not a problem when using single-source aka unity build (build with `env ESPURNA_BUILD_SINGLE_SOURCE=1`)
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//
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// Some sources:
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// - https://llvm.org/docs/CodingStandards.html#provide-a-virtual-method-anchor-for-classes-in-headers
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// > If a class is defined in a header file and has a vtable (either it has virtual methods or it derives from classes with virtual methods),
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// > it must always have at least one out-of-line virtual method in the class. Without this, the compiler will copy the vtable and RTTI into
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// > every .o file that #includes the header, bloating .o file sizes and increasing link times.
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// - http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1263r0.pdf
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// > This technique is unfortunate as it relies on detailed knowledge of how common toolchains work, and it may also require creating
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// > a dummy virtual function.
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explicit BasePin(unsigned char pin) :
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pin(pin)
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{}
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virtual ~BasePin() {
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}
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virtual operator bool() {
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return GPIO_NONE != pin;
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}
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virtual void pinMode(int8_t mode) = 0;
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virtual void digitalWrite(int8_t val) = 0;
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virtual int digitalRead() = 0;
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virtual String description() const = 0;
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const unsigned char pin { GPIO_NONE };
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};
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