Merge pull request #6239 from bmcdonnell-ionx/interrupt-in-pin-mode

Interrupt in pin mode

drivers/InterruptIn.cpp

@@ -19,16 +19,33 @@
 
 namespace mbed {
 
+// Note: This single-parameter constructor exists to maintain binary
+//       compatibility.
+//       If not for that, we could simplify by having only the 2-param
+//       constructor, with a default value for the PinMode.
 InterruptIn::InterruptIn(PinName pin) : gpio(),
                                         gpio_irq(),
                                         _rise(NULL),
                                         _fall(NULL) {
     // No lock needed in the constructor
-
+    irq_init(pin);
-    gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
     gpio_init_in(&gpio, pin);
 }
 
+InterruptIn::InterruptIn(PinName pin, PinMode mode) :
+                                        gpio(),
+                                        gpio_irq(),
+                                        _rise(NULL),
+                                        _fall(NULL) {
+    // No lock needed in the constructor
+    irq_init(pin);
+    gpio_init_in_ex(&gpio, pin, mode);
+}
+
+void InterruptIn::irq_init(PinName pin) {
+   gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
+}
+
 InterruptIn::~InterruptIn() {
     // No lock needed in the destructor
     gpio_irq_free(&gpio_irq);

drivers/InterruptIn.h

@@ -66,6 +66,15 @@ public:
      *  @param pin InterruptIn pin to connect to
      */
     InterruptIn(PinName pin);
+
+    /** Create an InterruptIn connected to the specified pin,
+     *  and the pin configured to the specified mode.
+     *
+     *  @param pin InterruptIn pin to connect to
+     *  @param mode The mode to set the pin to (PullUp/PullDown/etc.)
+     */
+    InterruptIn(PinName pin, PinMode mode);
+
     virtual ~InterruptIn();
 
     /** Read the input, represented as 0 or 1 (int)
@@ -153,6 +162,8 @@ protected:
 
     Callback<void()> _rise;
     Callback<void()> _fall;
+
+    void irq_init(PinName pin);
 };
 
 } // namespace mbed