File content as of revision 2:1b1c0502bb08:

/* 
    FPScanner.h v1.0 - Library for controlling the GT-511C3 Finger Print Scanner (FPS)
    Created by Josh Hawley, July 23rd 2013
    Licensed for non-commercial use, must include this license message
    basically, Feel free to hack away at it, but just give me credit for my work =)
    TLDR; Wil Wheaton's Law
*/

#ifndef FPScanner_H
#define FPScanner_H

#include "mbed.h"

typedef uint8_t byte;
typedef uint16_t word;


class Command_Packet
{
    public:
        class Commands
        {
            public:
                enum Commands_Enum
                {
                    NotSet              = 0x00,     // Default value for enum. Scanner will return error if sent this.
                    Open                = 0x01,     // Open Initialization
                    Close               = 0x02,     // Close Termination
                    UsbInternalCheck    = 0x03,     // UsbInternalCheck Check if the connected USB device is valid
                    ChangeEBaudRate     = 0x04,     // ChangeBaudrate Change UART baud rate
                    SetIAPMode          = 0x05,     // SetIAPMode Enter IAP Mode In this mode, FW Upgrade is available
                    CmosLed             = 0x12,     // CmosLed Control CMOS LED
                    GetEnrollCount      = 0x20,     // Get enrolled fingerprint count
                    CheckEnrolled       = 0x21,     // Check whether the specified ID is already enrolled
                    EnrollStart         = 0x22,     // Start an enrollment
                    Enroll1             = 0x23,     // Make 1st template for an enrollment
                    Enroll2             = 0x24,     // Make 2nd template for an enrollment
                    Enroll3             = 0x25,     // Make 3rd template for an enrollment, merge three templates into one template, save merged template to the database
                    IsPressFinger       = 0x26,     // Check if a finger is placed on the sensor
                    DeleteID            = 0x40,     // Delete the fingerprint with the specified ID
                    DeleteAll           = 0x41,     // Delete all fingerprints from the database
                    Verify1_1           = 0x50,     // Verification of the capture fingerprint image with the specified ID
                    Identify1_N         = 0x51,     // Identification of the capture fingerprint image with the database
                    VerifyTemplate1_1   = 0x52,     // Verification of a fingerprint template with the specified ID
                    IdentifyTemplate1_N = 0x53,     // Identification of a fingerprint template with the database
                    CaptureFinger       = 0x60,     // Capture a fingerprint image(256x256) from the sensor
                    MakeTemplate        = 0x61,     // Make template for transmission
                    GetImage            = 0x62,     // Download the captured fingerprint image(256x256)
                    GetRawImage         = 0x63,     // Capture & Download raw fingerprint image(320x240)
                    GetTemplate         = 0x70,     // Download the template of the specified ID
                    SetTemplate         = 0x71,     // Upload the template of the specified ID
                    GetDatabaseStart    = 0x72,     // Start database download, obsolete
                    GetDatabaseEnd      = 0x73,     // End database download, obsolete
                    UpgradeFirmware     = 0x80,     // Not supported
                    UpgradeISOCDImage   = 0x81,     // Not supported
                    Ack                 = 0x30,     // Acknowledge.
                    Nack                = 0x31      // Non-acknowledge
            };
        };

        Commands::Commands_Enum Command;
        byte Parameter[4];                              // Parameter 4 bytes, changes meaning depending on command                          
        byte* GetPacketBytes();                         // returns the bytes to be transmitted
        void ParameterFromInt(int i);

        Command_Packet();

    private: 
        static const byte COMMAND_START_CODE_1 = 0x55;  // Static byte to mark the beginning of a command packet    -   never changes
        static const byte COMMAND_START_CODE_2 = 0xAA;  // Static byte to mark the beginning of a command packet    -   never changes
        static const byte COMMAND_DEVICE_ID_1 = 0x01;   // Device ID Byte 1 (lesser byte)                           -   theoretically never changes
        static const byte COMMAND_DEVICE_ID_2 = 0x00;   // Device ID Byte 2 (greater byte)                          -   theoretically never changes
        byte command[2];                                // Command 2 bytes

        word _CalculateChecksum();                      // Checksum is calculated using byte addition
        byte GetHighByte(word w);                       
        byte GetLowByte(word w);
};


/*
    Response_Packet represents the returned data from the finger print scanner 
*/
class Response_Packet
{
    public:
        class ErrorCodes
        {
            public:
                enum Errors_Enum
                {
                    NO_ERROR                    = 0x0000,   // Default value. no error
                    NACK_TIMEOUT                = 0x1001,   // Obsolete, capture timeout
                    NACK_INVALID_BAUDRATE       = 0x1002,   // Obsolete, Invalid serial baud rate
                    NACK_INVALID_POS            = 0x1003,   // The specified ID is not between 0~199
                    NACK_IS_NOT_USED            = 0x1004,   // The specified ID is not used
                    NACK_IS_ALREADY_USED        = 0x1005,   // The specified ID is already used
                    NACK_COMM_ERR               = 0x1006,   // Communication Error
                    NACK_VERIFY_FAILED          = 0x1007,   // 1:1 Verification Failure
                    NACK_IDENTIFY_FAILED        = 0x1008,   // 1:N Identification Failure
                    NACK_DB_IS_FULL             = 0x1009,   // The database is full
                    NACK_DB_IS_EMPTY            = 0x100A,   // The database is empty
                    NACK_TURN_ERR               = 0x100B,   // Obsolete, Invalid order of the enrollment (The order was not as: EnrollStart -> Enroll1 -> Enroll2 -> Enroll3)
                    NACK_BAD_FINGER             = 0x100C,   // Too bad fingerprint
                    NACK_ENROLL_FAILED          = 0x100D,   // Enrollment Failure
                    NACK_IS_NOT_SUPPORTED       = 0x100E,   // The specified command is not supported
                    NACK_DEV_ERR                = 0x100F,   // Device Error, especially if Crypto-Chip is trouble
                    NACK_CAPTURE_CANCELED       = 0x1010,   // Obsolete, The capturing is canceled
                    NACK_INVALID_PARAM          = 0x1011,   // Invalid parameter
                    NACK_FINGER_IS_NOT_PRESSED  = 0x1012,   // Finger is not pressed
                    INVALID                     = 0XFFFF    // Used when parsing fails
                };

                static Errors_Enum ParseFromBytes(byte high, byte low);
        };
        Response_Packet(byte* buffer);
        ErrorCodes::Errors_Enum Error;
        byte RawBytes[12];
        byte ParameterBytes[4];
        byte ResponseBytes[2];
        bool ACK;
        static const byte COMMAND_START_CODE_1 = 0x55;  // Static byte to mark the beginning of a command packet    -   never changes
        static const byte COMMAND_START_CODE_2 = 0xAA;  // Static byte to mark the beginning of a command packet    -   never changes
        static const byte COMMAND_DEVICE_ID_1 = 0x01;   // Device ID Byte 1 (lesser byte)                           -   theoretically never changes
        static const byte COMMAND_DEVICE_ID_2 = 0x00;   // Device ID Byte 2 (greater byte)                          -   theoretically never changes
        int IntFromParameter();

    private: 
        bool CheckParsing(byte b, byte propervalue, byte alternatevalue);
        word CalculateChecksum(byte* buffer, int length);
        byte GetHighByte(word w);                       
        byte GetLowByte(word w);
};


/*
    Object for controlling the GT-511C3 Finger Print Scanner (FPS)
*/
class FPScanner
{
 
 public:

    // Creates a new object to interface with the fingerprint scanner
    FPScanner(PinName tx, PinName rx);

    //Initialises the device and gets ready for commands
    void Open();

    // Does not actually do anything (according to the datasheet)
    // I implemented open, so had to do closed too... lol
    void Close();

    // Turns on or off the LED backlight
    // LED must be on to see fingerprints
    // Parameter: true turns on the backlight, false turns it off
    // Returns: True if successful, false if not
    bool SetLED(bool on);
    
    // Changes the baud rate of the connection
    // Parameter: 9600 - 115200
    // Returns: True if success, false if invalid baud
    // NOTE: Untested (don't have a logic level changer and a voltage divider is too slow)
    bool ChangeBaudRate(int baud);

    // Gets the number of enrolled fingerprints
    // Return: The total number of enrolled fingerprints
    int GetEnrollCount();

    // checks to see if the ID number is in use or not
    // Parameter: 0-199
    // Return: True if the ID number is enrolled, false if not
    bool CheckEnrolled(int id);

    // Starts the Enrollment Process
    // Parameter: 0-199
    // Return:
    //  0 - ACK
    //  1 - Database is full
    //  2 - Invalid Position
    //  3 - Position(ID) is already used
    int EnrollStart(int id);

    // Gets the first scan of an enrollment
    // Return: 
    //  0 - ACK
    //  1 - Enroll Failed
    //  2 - Bad finger
    //  3 - ID in use
    int Enroll1();

    // Gets the Second scan of an enrollment
    // Return: 
    //  0 - ACK
    //  1 - Enroll Failed
    //  2 - Bad finger
    //  3 - ID in use
    int Enroll2();

    // Gets the Third scan of an enrollment
    // Finishes Enrollment
    // Return: 
    //  0 - ACK
    //  1 - Enroll Failed
    //  2 - Bad finger
    //  3 - ID in use
    int Enroll3();

    // Checks to see if a finger is pressed on the FPS
    // Return: true if finger pressed, false if not
    bool IsPressFinger();

    // Deletes the specified ID (enrollment) from the database
    // Returns: true if successful, false if position invalid
    bool DeleteID(int ID);

    // Deletes all IDs (enrollments) from the database
    // Returns: true if successful, false if db is empty
    bool DeleteAll();

    // Checks the currently pressed finger against a specific ID
    // Parameter: 0-199 (id number to be checked)
    // Returns:
    //  0 - Verified OK (the correct finger)
    //  1 - Invalid Position
    //  2 - ID is not in use
    //  3 - Verified FALSE (not the correct finger)
    int Verify1_1(int id);

    // Checks the currently pressed finger against all enrolled fingerprints
    // Returns:
    //  0-199: Verified against the specified ID (found, and here is the ID number)
    //  200: Failed to find the fingerprint in the database
    int Identify1_N();

    // Captures the currently pressed finger into onboard ram
    // Parameter: true for high quality image(slower), false for low quality image (faster)
    // Generally, use high quality for enrollment, and low quality for verification/identification
    // Returns: True if ok, false if no finger pressed
    bool CaptureFinger(bool highquality);


    // resets the Data_Packet class, and gets ready to download
    // Not implemented due to memory restrictions on the arduino
    // may revisit this if I find a need for it
    //void StartDataDownload();

    // Returns the next data packet 
    // Not implemented due to memory restrictions on the arduino
    // may revisit this if I find a need for it
    //Data_Packet GetNextDataPacket();

private:
     void SendCommand(byte cmd[], int length);
     Response_Packet* GetResponse();
     PinName pin_RX,pin_TX;
     Serial _serial;
};


#endif  //  FPScanner_H