From f0f9fc2601dc3421aa3f4d9747748c3bee93f703 Mon Sep 17 00:00:00 2001
From: Mike Fiore <mfiore@multitech.com>
Date: Thu, 12 Nov 2015 12:20:30 -0600
Subject: add class for handling button events - signals main thread when event
 occurs and main thread can check event - supports SW1 press, SW2 press, and
 SW1 hold

---
 ButtonHandler/ButtonHandler.cpp | 45 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 ButtonHandler/ButtonHandler.cpp

(limited to 'ButtonHandler/ButtonHandler.cpp')

diff --git a/ButtonHandler/ButtonHandler.cpp b/ButtonHandler/ButtonHandler.cpp
new file mode 100644
index 0000000..23bcb02
--- /dev/null
+++ b/ButtonHandler/ButtonHandler.cpp
@@ -0,0 +1,45 @@
+#include "ButtonHandler.h"
+
+ButtonHandler::ButtonHandler(osThreadId main)
+  : _main(main),
+    _sw1(PA_12),
+    _sw2(PA_11),
+    _sw1_time(0),
+    _event(none)
+{
+    // gpio goes low when push button is pressed
+    // fall handler will be the press, rise handler will be the release
+    _sw1.fall(this, &ButtonHandler::sw1_fall);
+    _sw1.rise(this, &ButtonHandler::sw1_rise);
+    // need to set mode to PullUp after attaching handlers - won't work otherwise
+    _sw1.mode(PullUp);
+
+    _sw2.fall(this, &ButtonHandler::sw2_fall);
+    _sw2.mode(PullUp);
+}
+
+ButtonEvent ButtonHandler::getButtonEvent() {
+    ButtonEvent event = _event;
+    _event = none;
+    return event;
+}
+
+void ButtonHandler::sw1_rise() {
+    _sw1_timer.stop();
+    _sw1_time = _sw1_timer.read_ms();
+
+    if (_sw1_time > 10) {
+        _event = (_sw1_time > 500) ? sw1_hold : sw1_press;
+        osSignalSet(_main, buttonSignal);
+    }
+}
+
+void ButtonHandler::sw1_fall() {
+    _sw1_timer.reset();
+    _sw1_timer.start();
+}
+
+void ButtonHandler::sw2_fall() {
+    _event = sw2_press;
+    osSignalSet(_main, buttonSignal);
+}
-- 
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