Alex Louden / Joystick

A class to handle reading, scaling and filtering horizontal and vertical position, and rise/fall interrupts for the button.

Joystick.h@4:beeaa40d49fa, 2010-09-28 (annotated)

Committer:
alex89_2
Date:
Tue Sep 28 16:32:20 2010 +0000
Revision:
4:beeaa40d49fa
Parent:
3:83b40e07476f 
Updated scale values - 0.51 midmin to 0.49, 0.55 midmax to 0.57

Who changed what in which revision?

UserRevisionLine numberNew contents of line
alex89_2 0:9c486d50434e 1 //remove repetition
alex89_2 0:9c486d50434e 2 #ifndef MBED_JOYSTICK_H
alex89_2 0:9c486d50434e 3 #define MBED_JOYSTICK_H
alex89_2 0:9c486d50434e 4
alex89_2 0:9c486d50434e 5 //required to use mbed functions
alex89_2 0:9c486d50434e 6 #include "mbed.h"
alex89_2 0:9c486d50434e 7
alex89_2 2:8805f880e231 8 /** Struct: joyhv
alex89_2 2:8805f880e231 9 *
alex89_2 2:8805f880e231 10 * Used for holding a horizontal and vertical position as doubles
alex89_2 2:8805f880e231 11 */
alex89_2 0:9c486d50434e 12 struct joyhv {
alex89_2 0:9c486d50434e 13 double h;
alex89_2 0:9c486d50434e 14 double v;
alex89_2 0:9c486d50434e 15 };
alex89_2 0:9c486d50434e 16
alex89_2 1:e55694d8a418 17 /** Class: Joystick
alex89_2 2:8805f880e231 18 *
alex89_2 0:9c486d50434e 19 * Used for reading from an analog joystick
alex89_2 0:9c486d50434e 20 *
alex89_2 0:9c486d50434e 21 * Example:
alex89_2 2:8805f880e231 22 *
alex89_2 0:9c486d50434e 23 * > #include "mbed.h"
alex89_2 2:8805f880e231 24 *
alex89_2 0:9c486d50434e 25 * > Joystick joy(p20, p19, p18);
alex89_2 0:9c486d50434e 26 */
alex89_2 0:9c486d50434e 27
alex89_2 0:9c486d50434e 28 class Joystick {
alex89_2 0:9c486d50434e 29 public:
alex89_2 1:e55694d8a418 30 /** Constructor: Joystick
alex89_2 0:9c486d50434e 31 *
alex89_2 0:9c486d50434e 32 * Variables:
alex89_2 0:9c486d50434e 33 * b - DigitalIn pin for button
alex89_2 0:9c486d50434e 34 * h - AnalogIn pin for horizontal
alex89_2 0:9c486d50434e 35 * v - AnalogIn pin for vertical
alex89_2 0:9c486d50434e 36 */
alex89_2 0:9c486d50434e 37 Joystick(PinName b, PinName h, PinName v);
alex89_2 0:9c486d50434e 38
alex89_2 2:8805f880e231 39 /** Function: read
alex89_2 0:9c486d50434e 40 * Read the joystick position, represented as a joyhv value - h and v are doubles in the range [0.0, 1.0]
alex89_2 0:9c486d50434e 41 *
alex89_2 0:9c486d50434e 42 * Variables:
alex89_2 0:9c486d50434e 43 * returns - A structure of two double values representing the position of the joystick,
alex89_2 0:9c486d50434e 44 * measured as a percentage vertically (joyhv.v) or horizontally (joyhv.h)
alex89_2 0:9c486d50434e 45 */
alex89_2 0:9c486d50434e 46 joyhv read();
alex89_2 0:9c486d50434e 47
alex89_2 2:8805f880e231 48 /** Function: getV
alex89_2 0:9c486d50434e 49 * Read the joystick's vertical position, represented as a double value in the range [0.0, 1.0]
alex89_2 0:9c486d50434e 50 *
alex89_2 0:9c486d50434e 51 * Variables:
alex89_2 0:9c486d50434e 52 * returns - A double values representing the vertical position of the joystick,
alex89_2 0:9c486d50434e 53 * measured as a percentage
alex89_2 0:9c486d50434e 54 */
alex89_2 0:9c486d50434e 55 double getV();
alex89_2 0:9c486d50434e 56
alex89_2 2:8805f880e231 57 /** Function: getH
alex89_2 0:9c486d50434e 58 * Read the joystick's horizontal position, represented as a double value in the range [0.0, 1.0]
alex89_2 0:9c486d50434e 59 *
alex89_2 0:9c486d50434e 60 * Variables:
alex89_2 0:9c486d50434e 61 * returns - A double values representing the horizontal position of the joystick,
alex89_2 0:9c486d50434e 62 * measured as a percentage
alex89_2 0:9c486d50434e 63 */
alex89_2 0:9c486d50434e 64 double getH();
alex89_2 0:9c486d50434e 65
alex89_2 2:8805f880e231 66 /** Function: rise
alex89_2 0:9c486d50434e 67 * Attach a function to call when a rising edge occurs on the button input
alex89_2 0:9c486d50434e 68 *
alex89_2 0:9c486d50434e 69 * Variables:
alex89_2 0:9c486d50434e 70 * fptr - A pointer to a void function, or 0 to set as none
alex89_2 0:9c486d50434e 71 */
alex89_2 0:9c486d50434e 72 void rise (void (*fptr)(void));
alex89_2 0:9c486d50434e 73
alex89_2 2:8805f880e231 74 /** Function: fall
alex89_2 0:9c486d50434e 75 * Attach a function to call when a falling edge occurs on the button input
alex89_2 0:9c486d50434e 76 *
alex89_2 0:9c486d50434e 77 * Variables:
alex89_2 0:9c486d50434e 78 * fptr - A pointer to a void function, or 0 to set as none
alex89_2 0:9c486d50434e 79 */
alex89_2 0:9c486d50434e 80 void fall (void (*fptr)(void));
alex89_2 0:9c486d50434e 81
alex89_2 2:8805f880e231 82 /** Function: operator joyhv
alex89_2 0:9c486d50434e 83 * An operator shorthand for <read()>
alex89_2 0:9c486d50434e 84 *
alex89_2 0:9c486d50434e 85 * The joyhv() operator can be used as a shorthand for <read()> to simplify common code sequences
alex89_2 0:9c486d50434e 86 *
alex89_2 0:9c486d50434e 87 */
alex89_2 0:9c486d50434e 88 operator joyhv ();
alex89_2 0:9c486d50434e 89
alex89_2 0:9c486d50434e 90 joyhv scale(joyhv read);
alex89_2 0:9c486d50434e 91 joyhv filter(joyhv read, double factor);
alex89_2 0:9c486d50434e 92
alex89_2 0:9c486d50434e 93
alex89_2 0:9c486d50434e 94 private:
alex89_2 0:9c486d50434e 95 InterruptIn _b;
alex89_2 0:9c486d50434e 96 AnalogIn _h;
alex89_2 0:9c486d50434e 97 AnalogIn _v;
alex89_2 0:9c486d50434e 98 };
alex89_2 0:9c486d50434e 99
alex89_2 0:9c486d50434e 100
alex89_2 0:9c486d50434e 101 #endif