[WIP] GPIO refactor: seems ok, ready for review

1 files changed, 82 insertions, 0 deletions

diff --git a/wirish/ext_interrupts.cpp b/wirish/ext_interrupts.cpp
new file mode 100644
index 0000000..5b32b05
--- /dev/null
+++ b/wirish/ext_interrupts.cpp
@@ -0,0 +1,82 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *****************************************************************************/
+
+/**
+ *  @file ext_interrupts.c
+ *
+ *  @brief Wiring-like interface for external interrupts
+ */
+
+#include "boards.h"
+#include "gpio.h"
+#include "exti.h"
+#include "ext_interrupts.h"
+
+static inline exti_trigger_mode exti_out_mode(ExtIntTriggerMode mode);
+
+/**
+ * @brief Attach an interrupt handler to a pin, triggering on the given mode.
+ * @param pin     Pin to attach an interrupt handler onto.
+ * @param handler Function to call when the external interrupt is triggered.
+ * @param mode    Trigger mode for the given interrupt.
+ * @see ExtIntTriggerMode
+ */
+void attachInterrupt(uint8 pin, voidFuncPtr handler, ExtIntTriggerMode mode) {
+    if (pin >= NR_GPIO_PINS || !handler) {
+        return;
+    }
+
+    exti_trigger_mode outMode = exti_out_mode(mode);
+
+    exti_attach_interrupt((afio_exti_num)(PIN_MAP[pin].pin),
+                          PIN_MAP[pin].ext_port,
+                          handler,
+                          outMode);
+}
+
+/**
+ * @brief Disable any external interrupt attached to a pin.
+ * @param pin Pin number to detach any interrupt from.
+ */
+void detachInterrupt(uint8 pin) {
+    if (pin >= NR_GPIO_PINS) {
+        return;
+    }
+
+    exti_detach_interrupt((afio_exti_num)(PIN_MAP[pin].pin));
+}
+
+static inline exti_trigger_mode exti_out_mode(ExtIntTriggerMode mode) {
+    switch (mode) {
+    case RISING:
+        return EXTI_RISING;
+    case FALLING:
+        return EXTI_FALLING;
+    case CHANGE:
+        return EXTI_RISING_FALLING;
+    }
+    // Can't happen
+    ASSERT(0);
+    return (exti_trigger_mode)0;
+}