1 files changed, 104 insertions, 0 deletions
diff --git a/core/ext_interrupts.c b/core/ext_interrupts.c
new file mode 100644
index 0000000..20ec11f
--- /dev/null
+++ b/core/ext_interrupts.c
@@ -0,0 +1,104 @@
+/* *****************************************************************************
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Created: 12/18/09 02:39:48
+ *  Copyright (c) 2009 Perry L. Hung. All rights reserved.
+ *
+ * ****************************************************************************/
+
+/**
+ *  @file ext_interrupts.c
+ *
+ *  @brief Wiring-like interface for external interrupts
+ */
+
+#include "wiring.h"
+#include "exti.h"
+#include "ext_interrupts.h"
+
+typedef struct ExtiInfo {
+    uint8_t channel;
+    uint8_t port;
+} ExtiInfo;
+
+static ExtiInfo PIN_TO_EXTI_CHANNEL[NR_MAPLE_PINS] = {
+    {EXTI3,  EXTI_CONFIG_PORTA},      // D0/PA3
+    {EXTI2,  EXTI_CONFIG_PORTA},      // D1/PA2
+    {EXTI0,  EXTI_CONFIG_PORTA},      // D2/PA0
+    {EXTI1,  EXTI_CONFIG_PORTA},      // D3/PA1
+    {EXTI5,  EXTI_CONFIG_PORTB},      // D4/PB5
+    {EXTI6,  EXTI_CONFIG_PORTB},      // D5/PB6
+    {EXTI8,  EXTI_CONFIG_PORTA},      // D6/PA8
+    {EXTI9,  EXTI_CONFIG_PORTA},      // D7/PA9
+    {EXTI10, EXTI_CONFIG_PORTA},      // D8/PA10
+    {EXTI7,  EXTI_CONFIG_PORTB},      // D9/PB7
+    {EXTI4,  EXTI_CONFIG_PORTA},      // D10/PA4
+    {EXTI7,  EXTI_CONFIG_PORTA},      // D11/PA7
+    {EXTI6,  EXTI_CONFIG_PORTA},      // D12/PA6
+    {EXTI5,  EXTI_CONFIG_PORTA},      // D13/PA5
+};
+
+
+/**
+ *  @brief Attach an interrupt handler to be triggered on a given
+ *  transition on the pin. Runs in interrupt context
+ *
+ *  @param[in] pin Maple pin number
+ *  @param[in] handler Function to run upon external interrupt trigger.
+ *  @param[in] mode Type of transition to trigger on, eg falling, rising, etc.
+ *
+ *  @sideeffect Registers a handler
+ */
+int attachInterrupt(uint8_t pin, voidFuncPtr handler, ExtInterruptTriggerMode mode) {
+    uint8_t outMode;
+    /* Parameter checking  */
+    if (pin >= NR_MAPLE_PINS) {
+        return EXT_INTERRUPT_INVALID_PIN;
+    }
+
+    if (!handler) {
+        ASSERT(0);
+        return EXT_INTERRUPT_INVALID_FUNCTION;
+    }
+
+    switch (mode) {
+    case RISING:
+        outMode = EXTI_RISING;
+        break;
+    case FALLING:
+        outMode = EXTI_FALLING;
+        break;
+    case CHANGE:
+        outMode = EXTI_RISING_FALLING;
+        break;
+    default:
+        ASSERT(0);
+        return EXT_INTERRUPT_INVALID_MODE;;
+    }
+
+    exti_attach_interrupt(PIN_TO_EXTI_CHANNEL[pin].channel,
+                          PIN_TO_EXTI_CHANNEL[pin].port,
+                          handler, mode);
+
+    return 0;
+}
+
+int detachInterrupt(uint8_t pin) {
+    if (!(pin < NR_MAPLE_PINS)) {
+        return EXT_INTERRUPT_INVALID_PIN;
+    }
+
+    exti_detach_interrupt(PIN_TO_EXTI_CHANNEL[pin].channel);
+}
+