MCP23S08.h

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#ifndef MCP23S08_H_
#define MCP23S08_H_
 
#include <stdint.h>
 
#define SELECT_MCP23S08     SPI_SELECT_IO_EXP               
#define DESELECT_MCP23S08   SPI_DESELECT_IO_EXP             
 
// register addresses
#define MCP23S08_IODIR      0x00
#define MCP23S08_IPOL       0x01
#define MCP23S08_GPINTEN    0x02
#define MCP23S08_DEFVAL     0x03
#define MCP23S08_INTCON     0x04
#define MCP23S08_IOCON      0x05
#define MCP23S08_GPPU       0x06
#define MCP23S08_INTF       0x07
#define MCP23S08_INTCAP     0x08
#define MCP23S08_GPIO       0x09
#define MCP23S08_OLAT       0x0A

typedef enum MCP23S08_PinModes
{
    MCP23S08_PINMODE_OUTPUT,     
    MCP23S08_PINMODE_INPUT,           
    MCP23S08_PINMODE_INPUT_PULLUP, 
}MCP23S08_PinModes_t;
 
class MCP23S08
{
    public:
        // constructors
        MCP23S08();
        MCP23S08(uint8_t deviceAddr);
    
        // call in setup
        void begin();
    
        // usage equivalent to the default IDE functions, see examples
        bool digitalReadIO(uint8_t pin);
        void digitalWriteIO(uint8_t pin, bool state);
        void pinModeIO(uint8_t pin, MCP23S08_PinModes_t mode);
    
        // advanced, write settings for all pins at once
        void setOutputStates(uint8_t states);
        void setPinModes(uint8_t modes);
        void enablePullups(uint8_t enables);
        void setInterruptOnChange(uint8_t mask);
        void setInterruptOnChangeDefaultCompare(uint8_t mask);
        void setInterruptControl(uint8_t mask);
        void setINTPinPushPullActiveState(bool activeLow);
    
        // advanced, get settings for all pin at once
        uint8_t getInputStates();
        uint8_t getOutputStates();
        uint8_t getPinModes();
        uint8_t getEnabledPullups();
        uint8_t getInterruptOnChange();
        uint8_t getInterruptOnChangeDefaultCompare();
        uint8_t getInterruptControl();
        uint8_t getInterruptFlags(); 
        uint8_t getInterruptCaptures();
        
    private:
        // private variables
        uint8_t deviceOpcode = 0x40;
    
        // low level SPI communication
        void writeRegister(uint8_t address, uint8_t data);
        uint8_t readRegister(uint8_t address);
};
 
#endif /* MCP23S08_H_ */