[Dave Flowerday]

Here is some code that can be used to scale the joysticks:

/* Typedefs so that compiler-independent types can be used.  These should be
 * defined in a single header file somewhere and included in all of your code.
 * While not strictly necessary, it is a good habit to get into. */
typedef char  s8;
typedef short s16;
typedef long  s32;

typedef unsigned char  u8;
typedef unsigned short u16;
typedef unsigned long  u32;

/* Always calibrate your joysticks so that they output 127 when in their
 * resting position.  Use the IFI Dashboard if necessary to help with this. */
#define JOYSTICK_MID 127

/* This function takes in a joystick value from the OI as well as a known
 * minimum and maximum value for this stick and scales it such that the value
 * is in the full 0-254 range.  The return value from the function is the new,
 * scaled value. */
u8 scale_joystick(u8 joystick_orig, u8 joystick_min, u8 joystick_max)
{
    s16 scaled_val = JOYSTICK_MID;

    /* First, make sure the original joystick value falls in between
     * joystick_min and joystick_max, in case it's slightly higher or lower
     * than we expected. */
    if(joystick_orig > joystick_max)
    {
        joystick_orig = joystick_max;
    }
    else if(joystick_orig < joystick_min)
    {
        joystick_orig = joystick_min;
    }

    if(joystick_orig > JOYSTICK_MID)
    {
        /* Formula: ((positive joystick deflection / positive range) * 127) +
         * 127.  Multiply by 127 before dividing by the range in order to
         * avoid floating-point operations. */
        scaled_val = ((s16)JOYSTICK_MID) +
            ((((s16)joystick_orig - ((s16)JOYSTICK_MID)) *
              ((s16)JOYSTICK_MID)) /
            ((s16)joystick_max - ((s16)JOYSTICK_MID)));
    }
    else if(joystick_orig < JOYSTICK_MID)
    {
        /* Formula: 127 - ((negative joystick deflection / negative range) *
         * 127).  Multiply by 127 before dividing by the range in order to
         * avoid floating-point operations. */
        scaled_val = ((s16)JOYSTICK_MID) -
            (((((s16)JOYSTICK_MID) - (s16)joystick_orig) *
              ((s16)JOYSTICK_MID)) /
            (((s16)JOYSTICK_MID) - (s16)joystick_min));
    }
    else
    {
        /* Do nothing - the incoming joystick value was 127, and the scaled
         * value is already defaulted to this. */
    }

    return scaled_val;
}

To use this code, you should determine the minimum and maximum values for each axis of each joystick and store them in your code as #defines. Then, call this function like this:

    /* #defines as an example */
    #define PORT1_X_MIN 24
    #define PORT1_X_MAX 249
    #define PORT1_Y_MIN 22
    #define PORT1_Y_MAX 250

    ...

    p1_x = scale_joystick(p1_x, PORT1_X_MIN, PORT1_X_MAX);
    p1_y = scale_joystick(p1_y, PORT1_Y_MIN, PORT1_Y_MAX);

You'll want to put that code shortly after the Getdata() call in Process_Data_From_Master_uP(), before p1_x, p1_y, etc. get used by anything else. Don't forget to change your #defines if you change your joysticks.