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#ifndef MAX4822_H
#define MAX4822_H

#include "mbed.h"

/**
* @brief MAX4822 - +3.3V/+5V, 8-Channel, Relay Drivers with Fast Recovery 
* Time and Power-Save Mode
* 
* @details The MAX4822–MAX4825 8-channel relay drivers offer built-in 
* kickback protection and drive +3V/+5V nonlatching or dual-coil-latching 
* relays. Each independent open-drain output features a 2.7Ω (typ) 
* on-resistance and is guaranteed to sink 70mA (min) of load current. 
* These devices consume less than 300µA (max) quiescent current and have 
* 1µA output off-leakage current. A Zener-kickback-protection circuit 
* significantly reduces recovery time in applications where switching 
* speed is critical.
*/

class MAX4822
{
    public:
    
    static const uint8_t OUTPUT_CNTL_REG = 0;
    
    static const uint8_t POWER_SAVE_REG = 1;
    
    enum RelayChannel
    {
        NONE,
        RLY_1,
        RLY_2,
        RLY_3,
        RLY_4,
        RLY_5,
        RLY_6,
        RLY_7,
        RLY_8
    };
    
    enum PowerSave
    {
        DISABLED,
        SEVENTY_PERCENT_VCC,
        SIXTY_PERCENT_VCC,
        FIFTY_PERCENT_VCC,
        FORTY_PERCENT_VCC,
        THIRTY_PERCENT_VCC,
        TWENTY_PERCENT_VCC,
        TEN_PERCENT_VCC
    };
    
    enum CmdResult
    {
        OpFailure,
        Success
    };
        
    
    ///@brief MAX4822 Constructor
    ///@param[in] spi_bus - reference to SPI bus for this device
    ///@param[in] cs - Pin connected to chip select of this device
    ///@param[in] num_devices - Number of daisychained devices; defaults to 0.
    MAX4822(SPI & spi_bus, PinName cs = D10, uint8_t num_devices = 0);
    
    ///@brief MAX4822 Destructor
    ~MAX4822();
    
    ///@brief Sets all relays of device connected to set
    ///@param[in] set - Pin connected to SET pin of device
    ///@param[in] device - Device number in daisychain mode, defaults to 0
    ///@return Result of operation.
    CmdResult set_all_relays(DigitalOut & set, uint8_t device = 0);
    
    ///@brief Resets all relays of device connected to reset
    ///@param[in] reset - Pin connected to RESET pin of device
    ///@param[in] device - Device number in daisychain mode, defaults to 0
    ///@return Result of operation.
    CmdResult reset_all_relays(DigitalOut & reset, uint8_t device = 0);
    
    ///@brief Sets private relay state and sends it if 'send_data' is true
    ///@param[in] r - Relay to set
    ///@param[in] send_data - Default value is true.  
    ///If false, private array is updated appropriately.  This allows the user to
    ///update the data array and then send all data on last update.
    ///@param[in] n - MAX4822 device in daisychained mode; defaults to 0.
    ///@return Result of operation.
    CmdResult set_relay(RelayChannel r, bool send_data = true, uint8_t n = 0);
    
    ///@brief Clears private relay state and sends it if 'send_data' is true
    ///@param[in] r - Relay to reset
    ///@param[in] send_data - Default value is true.  
    ///If false, private array is updated appropriately.  This allows the user to
    ///update the data array and then send all data on last update.
    ///@param[in] n - MAX4822 device in daisychained mode; defaults to 0.
    ///@return Result of operation.
    CmdResult reset_relay(RelayChannel r, bool send_data = true, uint8_t n = 0);
    
    ///@brief Sets private power save value nd sends it if 'send_data' is true
    ///@param[in] pwr_save - Power save value 
    ///@param[in] send_data - Default value is true.  
    ///If false, private array is updated appropriately.  This allows the user to
    ///update the data array and then send all data on last update.
    ///@param[in] n - MAX4822 device in daisychained mode; defaults to 0.
    ///@return Result of operation.
    CmdResult set_pwr_save(PowerSave pwr_save, bool send_data = true, uint8_t n = 0);
    
    private:
    
    SPI & m_spi;
    DigitalOut m_cs;
    uint8_t m_num_devices;
    PowerSave pwr_save;
    
    uint8_t m_relay_data[256];
    uint8_t m_pwr_save_data[256];
};

#endif /* MAX4822_H */