1 files changed, 65 insertions, 0 deletions
diff --git a/src/wiring/ext_interrupts.c b/src/wiring/ext_interrupts.c
new file mode 100644
index 0000000..0a35472
--- /dev/null
+++ b/src/wiring/ext_interrupts.c
@@ -0,0 +1,65 @@
+#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, void (*handler)(void), uint8_t mode) {
+    /* Parameter checking  */
+    if (pin >= NR_MAPLE_PINS) {
+        return EXT_INTERRUPT_INVALID_PIN;
+    }
+
+    if (!handler) {
+        return EXT_INTERRUPT_INVALID_FUNCTION;
+    }
+
+    if (!(mode < NR_EXTI_MODES)) {
+        return EXT_INTERRUPT_INVALID_MODE;
+    }
+
+    exti_attach_interrupt(PIN_TO_EXTI_CHANNEL[pin].channel, 
+                          PIN_TO_EXTI_CHANNEL[pin].port,
+                          handler, mode);
+}
+
+int detachInterrupt(uint8_t pin) {
+    if (!(pin < NR_MAPLE_PINS)) {
+        return EXT_INTERRUPT_INVALID_PIN;
+    }
+
+    exti_detach_interrupt(PIN_TO_EXTI_CHANNEL[pin].channel);
+}
+