WIP

08-74HC595-Snake/controls.h

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+#ifndef _JOYSTICK_H_
+#define _JOYSTICK_H_
+
+#include <Arduino.h>
+#include <stdint.h>
+
+#define BUTTON_STABLETIME    100
+#define JOYSTICK_STABLETIME  3000
+
+// Button states
+#define BUTTON_STATE_BOUNCING     (1 << 0)
+#define BUTTON_STATE_DOWN         (1 << 1)
+#define BUTTON_STATE_UP           (1 << 2)
+#define BUTTON_STATE_HELD         (1 << 3)
+
+// Joystick states
+#define JOYSTICK_STATE_CALIBRATING (1 << 0)
+#define JOYSTICK_STATE_CALIBRATED  (1 << 1)
+#define JOYSTICK_STATE_READING     (1 << 2)
+#define JOYSTICK_STATE_READY       (1 << 3)
+
+typedef struct Calibration {
+	// When did calibration start
+	uint32_t start_time;
+	// Low calibration range
+	uint32_t low;
+	// High calibration range
+	uint32_t high;
+	// How long we should sample values on this joystick
+	uint32_t stable_time;
+} Calibration;
+
+typedef struct Button {
+	// What pin is this button on
+	uint8_t pin;
+	// What is the state of this button (bitmask of BUTTON_STATE_*)
+	uint8_t state;
+	// Is this button pressed when it is LOW or HIGH?
+	uint32_t pressedvalue;
+	// How long do we wait when debouncing this button
+	uint32_t debouncetime;
+	// When did we start debouncing
+	uint32_t debounce_start_time;
+} Button;
+
+typedef struct JoystickAxis {
+	// What ADC pin is this joystick axis connected to
+	uint8_t pin;
+	// Calibration data
+	Calibration calibration;
+	// Position as of the last read time.
+	uint32_t position;
+} JoystickAxis;
+
+typedef struct Joystick {
+	// X axis data
+	JoystickAxis x;
+	// Y axis data
+	JoystickAxis y;
+	// This is the Z axis switch on the joystick control
+	Button button;
+	// What is the state of this joystick (bitmask of JOYSTICK_STATE_*)
+	uint8_t state;
+} Joystick;
+
+int initJoystick(Joystick *js, uint8_t pin_x, uint8_t pin_y, uint8_t pin_z);
+int initButton(Button *button);
+int calibrateJoystick(Joystick *js);
+int readButton(Button *button);
+int readJoystick(Joystick *js);
+
+#endif // _JOYSTICK_H_