Diff: joystick.cpp

Revision:

0:f79fe9dc65ee

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/joystick.cpp	Wed May 04 13:01:09 2016 +0000
@@ -0,0 +1,49 @@
+/** Temperature Sensor Functions
+* Used for printing and updating the temperature at 1Hz with unit conversion capabilities
+@file joystick.cpp
+@brief contains functions for joystick update/calibration and direction names with specification
+@author Craig Evans
+@date May 2016
+*/
+
+#include "joystick.h"
+
+extern Joystick joystick;
+
+void calibrateJoystick()
+{
+    button.mode(PullDown);// additional pull down for external button
+    Jbutton.mode(PullDown);
+    // must not move during calibration
+    joystick.x0 = xPot;  // initial positions in the range 0.0 to 1.0 (0.5 if centred exactly)
+    joystick.y0 = yPot;
+}
+
+Joystick return_data(){
+    return joystick;
+}
+void updateJoystick()
+{
+    // read current joystick values relative to calibrated values (in range -0.5 to 0.5, 0.0 is centred)
+    joystick.x = xPot - joystick.x0;
+    joystick.y = yPot - joystick.y0;
+    // read button state
+    joystick.button = button;
+
+    // calculate direction depending on x,y values
+    // tolerance allows a little lee-way in case joystick not exactly in the stated direction
+    if ( fabs(joystick.y) < DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
+        joystick.direction = CENTRE;
+    } else if ( joystick.y > DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
+        joystick.direction = UP;
+    } else if ( joystick.y < DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
+        joystick.direction = DOWN;
+    } else if ( joystick.x > DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
+        joystick.direction = RIGHT;
+    } else if ( joystick.x < DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
+        joystick.direction = LEFT;
+    } else {
+        joystick.direction = UNKNOWN;
+    }
+
+}
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