Tutorial 4 - External Hardware Interrupts - AT32UC3A

1: __attribute__((__interrupt__))
 2: static void int_handler_port1_line0 (void)
 3: {
 4:  if( gpio_get_pin_interrupt_flag( QT1081_TOUCH_SENSOR_0 ) )
 5:  {   // PB2 generated the interrupt.
 6:   gpio_tgl_gpio_pin(LED1_GPIO);
 7:   // Clear the interrupt flag of the pin PB2 is mapped to.
 8:   gpio_clear_pin_interrupt_flag(QT1081_TOUCH_SENSOR_0);
 9:  }
10: }
11: 
12: 
13: // Main function
14: int main(void)
15: {
16:  U32 i;
17: 
18:  // Set CPU and PBA clock
19:  pcl_switch_to_osc(PCL_OSC0, FOSC0, OSC0_STARTUP);
20:  
21:  gpio_configure_pin(LED1_GPIO, GPIO_DIR_OUTPUT|GPIO_INIT_HIGH);
22:  gpio_enable_pin_interrupt(QT1081_TOUCH_SENSOR_0, GPIO_PIN_CHANGE);
23:  Disable_global_interrupt ();
24:  INTC_init_interrupts ();
25:  
26:  // register push button handler for PB2 and PB3
27:  INTC_register_interrupt( &int_handler_port1_line0, 
28:                            AVR32_GPIO_IRQ_0 + (QT1081_TOUCH_SENSOR_0/8), 0);
29: 
30:  Enable_global_interrupt ();
31:  while(true);
32: }