Upload New File

functionality/interrupt/interrupt.8e5.c

+//
+// xmega 8e5 interrupt example
+//
+// with a button on pin 4 port C and an LED on pin 0 port C
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+
+#define SLAVE_ADDRESS    0x56
+#define CPU_SPEED       32000000
+
+// ISR = interrupt service routine, program that runs when an interrupt is triggered on PORTC
+ISR(PORTC_INT_vect)
+{
+    // Toggle LED on interrupt
+    PORTC.OUTSET = PIN0_bm;
+    _delay_ms(100);
+    PORTC.OUTCLR = PIN0_bm;
+
+    // the interrupt has to be cleared within the ISR
+    PORTC.INTFLAGS = PIN4_bm;
+}
+
+
+int main(void) {
+  // set up clock
+  OSC.CTRL = OSC_RC32MEN_bm; // enable 32MHz clock
+  while (!(OSC.STATUS & OSC_RC32MRDY_bm)); // wait for clock to be ready
+  CCP = CCP_IOREG_gc; // enable protected register change
+  CLK.CTRL = CLK_SCLKSEL_RC32M_gc; // switch to 32MHz clock
+  
+  //enable interrupts
+  PMIC.CTRL |= PMIC_LOLVLEX_bm;
+  
+  //set up LED as output 
+  PORTC.DIRSET = PIN0_bm;
+  
+  // External interrupt on PC4, enable internal pullup resistor, sense falling edge
+  PORTC.PIN4CTRL = PORT_OPC_PULLUP_gc | PORT_ISC_FALLING_gc;
+  PORTC.INTMASK = PIN4_bm;
+  PORTC.INTCTRL = PORT_INTLVL_LO_gc;
+  // Enable low level interrupts
+  PMIC.CTRL |= PMIC_LOLVLEN_bm;
+  sei(); //set global interrupt enable
+
+  while(1){
+   }
+}
+
+
+
+
+
+
+
+
+
+