/* G Play header for Railroad Handcar arcade game */

/**************************************************/
/* Defines                                        */
/**************************************************/

/* Raw speed for handpump to overcome board noise */

#define NOISE                  25

/* Send signal port UP or DN for puppet hand pump */

#define UP                      0
#define DN                      1

/* Send signal port UP or DN for puppet hand pump */

#define FW                      1
#define BK                      0

/* How fast is villain compared to hand car speed */

#define VILLAIN_SPEED          25
#define ACCUMULATOR_MAX        50

/* Position extremes for villain front-back moves */
/* The maximum sweep angle of the servo is 60 deg */

#define SERVO_MAX              44
#define SERVO_MIN              18
#define SERVO_HYS               6

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/* Prototypes                                     */
/**************************************************/

/* Get raw handcar velocity to sync w/puppet pump */

unsigned char HandleDiff(void);

/* Calculate the handcar's velocity (range 0-100) */

unsigned char CalculateVelocity(void);

/* Account for the servo's dead-band (hysteresis) */

void CalculateChase(unsigned int Speed);

/* Move villain left or right relative to handcar */

void AdvanceVillain(char Dir);

/* Move villain left or right relative to handcar */

char Caught(void);

/* Check that hand car is currently over obstacle */

char Colliding(void);