initial avr projects (blink + interrupts)

2026-04-03 09:42:37 +11:00
commit 2c9714c851
7 changed files with 196 additions and 0 deletions
--- a/interrupts/main.c
+++ b/interrupts/main.c
@@ -0,0 +1,35 @@
+#include "delay.h"
+#include <avr/interrupt.h>
+volatile uint8_t flag=0;
+
+int main(void){
+timer1_init();
+  DDRC |= (1<<PC0);                          // PB1 (D9)
+   // prescaler 8
+  DDRD &= ~(1 << PD2);
+  PORTD |= (1 << PD2);
+  EICRA &= ~(1<<ISC00);
+  EICRA |= (1<<ISC01);
+  EIMSK |= (1<<INT0);
+
+  sei();
+  while(1){
+    if(flag){
+
+      flag=0;
+    PORTC |=(1<<PC0); 
+    delay_ms(500); 
+    PORTC &=~(1<<PC0);
+    delay_ms(500);
+    }
+    else{
+      PORTC |=(1<<PC0);
+      delay_ms(50);
+      PORTC &=~(1<<PC0);
+      delay_ms(50);
+    }           // 75%
+  }
+}
+ISR(INT0_vect){
+  flag=1; 
+}