Diff: mbed-dev-master/drivers/InterruptIn.cpp

Revision:

0:bb348c97df44

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev-master/drivers/InterruptIn.cpp	Wed Sep 16 01:11:49 2020 +0000
@@ -0,0 +1,138 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "drivers/InterruptIn.h"
+
+#if DEVICE_INTERRUPTIN
+
+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_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);
+}
+
+int InterruptIn::read()
+{
+    // Read only
+    return gpio_read(&gpio);
+}
+
+void InterruptIn::mode(PinMode pull)
+{
+    core_util_critical_section_enter();
+    gpio_mode(&gpio, pull);
+    core_util_critical_section_exit();
+}
+
+void InterruptIn::rise(Callback<void()> func)
+{
+    core_util_critical_section_enter();
+    if (func) {
+        _rise = func;
+        gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
+    } else {
+        _rise = NULL;
+        gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
+    }
+    core_util_critical_section_exit();
+}
+
+void InterruptIn::fall(Callback<void()> func)
+{
+    core_util_critical_section_enter();
+    if (func) {
+        _fall = func;
+        gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
+    } else {
+        _fall = NULL;
+        gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
+    }
+    core_util_critical_section_exit();
+}
+
+void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event)
+{
+    InterruptIn *handler = (InterruptIn *)id;
+    switch (event) {
+        case IRQ_RISE:
+            if (handler->_rise) {
+                handler->_rise();
+            }
+            break;
+        case IRQ_FALL:
+            if (handler->_fall) {
+                handler->_fall();
+            }
+            break;
+        case IRQ_NONE:
+            break;
+    }
+}
+
+void InterruptIn::enable_irq()
+{
+    core_util_critical_section_enter();
+    gpio_irq_enable(&gpio_irq);
+    core_util_critical_section_exit();
+}
+
+void InterruptIn::disable_irq()
+{
+    core_util_critical_section_enter();
+    gpio_irq_disable(&gpio_irq);
+    core_util_critical_section_exit();
+}
+
+InterruptIn::operator int()
+{
+    // Underlying call is atomic
+    return read();
+}
+
+} // namespace mbed
+
+#endif