Diff: Joystick.cpp

Revision:

0:56a82b52e0d4

Child:

1:78d3e8b50d19

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Joystick.cpp	Thu Apr 28 14:14:22 2016 +0000
@@ -0,0 +1,103 @@
+//Joystick Class - Implementation
+#include "Joystick.h"
+#include "mbed.h"
+
+Joystick::Joystick(PinName x_axis_pin, PinName y_axis_pin, PinName button_pin) {
+        x_axis_ = new AnalogIn(x_axis_pin);
+        y_axis_ = new AnalogIn(y_axis_pin);
+        button_ = new InterruptIn(button_pin);
+        button_debounce_ = new Timeout();
+}
+
+Joystick::~Joystick() {
+        delete x_axis_;
+        delete y_axis_;
+        delete button_;
+        delete button_debounce_;
+}
+
+void Joystick::init() {
+        //Sets up the button ISR
+        button_->mode(PullDown);
+        button_->rise(this, &Joystick::button_isr);
+
+        //Initalises the vairables and flags
+        x_offset_ = 0;
+        y_offset_ = 0;
+        g_button_flag_ = false;
+        g_button_debounce_flag_ = false;
+
+        //Samples the joystick 5 times and takes an average to get the offset
+        float x_sum = 0;
+        float y_sum = 0;
+
+        for (int i = 0; i < 5; ++i) {
+            x_sum += x_axis_->read();
+            y_sum += y_axis_->read();
+        }
+
+        x_offset_ = 0.5f - x_sum/5.0f;
+        y_offset_ = 0.5f - y_sum/5.0f;
+}
+
+float Joystick::GetXValue() {
+
+        float x_sum = 0;
+        //Iterates 5 times and calculates an average
+        for (int i = 0; i < 5; ++i) {
+            x_sum += x_axis_->read();
+        }
+
+        float x_value = x_sum/5.0f + x_offset_;
+
+        //Caps the value for the POT between 0 and 1
+        if (x_value < 0.0f) {
+            return 0;
+        } else if (x_value > 1.0f) {
+            return 1;
+        } else {
+            return x_value;
+        }
+}
+
+float Joystick::GetYValue() {
+
+        float y_sum = 0;
+        //Iterates 5 times and calculates an average
+        for (int i = 0; i < 5; ++i) {
+            y_sum += y_axis_->read();
+        }
+
+        float y_value = y_sum/5.0f + y_offset_;
+
+        //Caps the value for the POT between 0 and 1
+        if (y_value < 0.0f) {
+            return 0;
+        } else if (y_value > 1.0f) {
+            return 1;
+        } else {
+            return y_value;
+        }
+}
+
+int Joystick::get_button_flag() {
+        return g_button_flag_;
+}
+
+void Joystick::set_button_flag(bool value) {
+        g_button_flag_ = value;
+}
+
+void Joystick::button_isr() {
+        if (!g_button_debounce_flag_) {
+            g_button_flag_ = true;
+            g_button_debounce_flag_ = true;
+
+            //Sets up the debounce ticker to fire in 0.2s
+            button_debounce_->attach(this, &Joystick::button_debounce_isr, 0.2);
+        }
+}
+
+void Joystick::button_debounce_isr() {
+        g_button_debounce_flag_ = false;
+}
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