io card support

Template Project/lib/ESPMegaPRO/DigitalInputCard.hpp

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+#pragma once
+#include <ESPMegaPRO.h>
+#include <PCF8574.h>
+
+class DigitalInputCard {
+    public:
+        // Instantiate the card with the specified address
+        DigitalInputCard(uint8_t address_a, uint8_t address_b);
+        // Instantiate the card with the specified position on the dip switch
+        DigitalInputCard(bool bit0, bool bit1, bool bit2, bool bit3, bool bit4, bool bit5);
+        // Initialize the card
+        void begin();
+        // Refresh and Read the input from the specified pin, always refresh the input buffers
+        uint8_t digitalRead(uint8_t pin);
+        // Read the input from the specified pin, also refresh the input buffers if refresh is true
+        uint8_t digitalRead(uint8_t pin, bool refresh);
+        // Preform a loop to refresh the input buffers
+        void loop();
+        // Get the input buffer for bank A
+        uint8_t getInputBufferA();
+        // Get the input buffer for bank B
+        uint8_t getInputBufferB();
+        // Register a callback function to be called when a pin changes
+        void registerCallback(void (*callback)(int, bool));
+    private:
+        PCF8574 inputBankA;
+        PCF8574 inputBankB;
+        uint8_t address_a;
+        uint8_t address_b;
+        uint8_t inputBufferA;
+        uint8_t inputBufferB;
+        void (*callback)(int, bool);
+        void refreshInputBankA();
+        void refreshInputBankB();
+};