From 713417cde7dfd45f05ba7b5f224b7cab4e36e240 Mon Sep 17 00:00:00 2001
From: Christoph Haberer <c.hab@gmx.net>
Date: Sun, 23 Apr 2017 14:23:05 +0200
Subject: [PATCH] UserButton example added

---
 .../Discovery407VG/UserButton/UserButton.ino  | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 STM32/libraries/BoardExamples/examples/Discovery407VG/UserButton/UserButton.ino

diff --git a/STM32/libraries/BoardExamples/examples/Discovery407VG/UserButton/UserButton.ino b/STM32/libraries/BoardExamples/examples/Discovery407VG/UserButton/UserButton.ino
new file mode 100644
index 0000000..a31fe3f
--- /dev/null
+++ b/STM32/libraries/BoardExamples/examples/Discovery407VG/UserButton/UserButton.ino
@@ -0,0 +1,34 @@
+// show user button state with blinking LEDs
+// STM32F4 Discovery has one user button
+//
+// red LED:   button pressed
+// grenn LED: button not pressed
+
+#define USERBUTTON               PA0
+
+#define GREENLED                PD12
+#define ORANGELED               PD13
+#define REDLED                  PD14
+#define BLUELED                 PD15
+#define REDLEDOTGOVERCURRENT     PD5
+
+void setup()
+{
+  pinMode(USERBUTTON, INPUT); // mandatory for STM MCUs, on Arduino Uno working without
+  pinMode(GREENLED,  OUTPUT);
+  pinMode(REDLED,    OUTPUT);
+}
+
+void loop()
+{
+  if  ( digitalRead(USERBUTTON) )digitalWrite(REDLED  , HIGH);
+  else                           digitalWrite(GREENLED, HIGH);
+  
+  delay(100);
+
+  // leds off
+  digitalWrite(GREENLED, LOW);
+  digitalWrite(REDLED  , LOW);
+  
+  delay(100);
+}