Daniel,
GIO interrupt are level sensitive. Rising or Falling edge can be selected in Halcogen for a given pin.
The corresponding code can be found in gio.c in the void gioInit(void) API.
In the following example, GIOA_0 is used as "Rising Edge", "High Priority"
/** @b initialize @b interrupts */
/** - interrupt polarity */
gioREG->POL = (uint32)((uint32)1U << 0U) /* Bit 0 */ // Rising Edge
| (uint32)((uint32)0U << 1U) /* Bit 1 */
| (uint32)((uint32)0U << 2U) /* Bit 2 */
| (uint32)((uint32)0U << 3U) /* Bit 3 */
| (uint32)((uint32)0U << 4U) /* Bit 4 */
| (uint32)((uint32)0U << 5U) /* Bit 5 */
| (uint32)((uint32)0U << 6U) /* Bit 6 */
/** - interrupt level */
gioREG->LVLSET = (uint32)((uint32)1U << 0U) /* Bit 0 */ //High Priority
| (uint32)((uint32)0U << 1U) /* Bit 1 */
| (uint32)((uint32)0U << 2U) /* Bit 2 */
| (uint32)((uint32)0U << 3U) /* Bit 3 */
| (uint32)((uint32)0U << 4U) /* Bit 4 */
| (uint32)((uint32)0U << 5U) /* Bit 5 */
| (uint32)((uint32)0U << 6U) /* Bit 6 */
| (uint32)((uint32)0U << 7U) /* Bit 7 */
/** - enable interrupts */
gioREG->ENASET = (uint32)((uint32)1U << 0U) /* Bit 0 */ // Interrupt Enable
| (uint32)((uint32)0U << 1U) /* Bit 1 */
| (uint32)((uint32)0U << 2U) /* Bit 2 */
| (uint32)((uint32)0U << 3U) /* Bit 3 */
| (uint32)((uint32)0U << 4U) /* Bit 4 */
| (uint32)((uint32)0U << 5U) /* Bit 5 */
| (uint32)((uint32)0U << 6U) /* Bit 6 */
| (uint32)((uint32)0U << 7U) /* Bit 7 */
This code correspond to the following graphic configuration:
