Added debouncing section from the old code.

src/main.c

@@ -1,3 +1,18 @@
+/*
+ * Author: Jake G Email: jakegoodwin@gorge.works
+ * FileName: main.c
+ * Date: 2025
+ * Descripton: Program for Atiny13A controllers
+ */
+
+#ifndef MCU
+#define MCU atiny13a
+#endif
+
+#ifndef F_CPU
+#define F_CPU 4800000UL
+#endif
+
 #include "stdio.h"
 
 #include <avr/io.h>
@@ -9,6 +24,10 @@
 //Globals
 //#############################
 
+
+//Debounce check number.
+#define MAX_CHECKS 10
+
 #define LED_PORT (1<<5) 
 #define LED_PIN PB5
 #define BLINK_DELAY_MS 5000
@@ -72,19 +91,81 @@ int main(int argc, char **argv)
 //FUNCTIONS
 //#############################
 
-/*
- * Input: None
- * Output: None
- * Description: Toggles the pin for the LED indicator.
- */
-void led_blink(void) {
-    //Set the DDR for output.
-    DDRB |= LED_PORT;
 
-    PORTB ^= (1<<LED_PIN);
-    _delay_ms(500);
-    PORTB ^= (1<<LED_PIN);
-    _delay_ms(500);
-    
+/*
+ * ############################
+ * DEBOUNCING CODE 
+ * ############################
+ */ 
+
+/*
+ * INPUT: The port to check.
+ * OUTPUT: None
+ * DESCRIPTION: Updates the global debounced state. This function
+ * should be called in a ISR a set rate using the hardware timer.
+ */
+static inline void debounce_switch() {
+    uint8_t i, j;
+    db_state[idx] = PINB & 0xFF;
+    idx+=1;
+    j = 0xff;    
+    /*Loop through a number of checks*/
+    for(i = 0; i < MAX_CHECKS; i++) {
+        j = j & db_state[i];
+    }
+    debounced_state = j;
+
+    if(idx >= MAX_CHECKS) {
+        idx = 0;
+    }
 }
 
+
+
+/*Setup the timer0 on the AVR*/
+static inline void init_timer0() { 
+    /*Zero out the tick_count var*/
+    tick_count = 0;
+
+    /*config to normal mode.*/
+    TCCR0A = 0x00;  //stop timer
+    TCCR0B = 0x00;  //zero timer
+
+    /*set prescaler*/
+    //Set to div64
+    TCCR0B |= (1<<CS01)|(1<<CS00);
+
+    
+    /*Enable global interrupts*/
+    sei();
+
+    /*Enabling timer0 interrupt*/
+    TCNT0 = 0;
+    TIMSK0 |= (1<<TOIE0);
+}
+
+
+//ISR(TIMER0_OVF_vect)
+
+/*The interrupt service routine for the timer0*/
+ISR(TIM0_OVF_vect)
+{
+    /*Disable global interrupts*/
+    cli();
+
+    /*Check the state of the switches*/
+    debounce_switch();
+
+    /*Update the tick_count*/
+    if(btn1.timer_enabled && btn1.pressed_ticks <= UINT8_MAX){
+        btn1.pressed_ticks += 1;
+    }
+
+    if(btn2.timer_enabled && btn2.pressed_ticks <= UINT8_MAX){
+        btn2.pressed_ticks += 1;
+    }
+
+
+    /*Re-Enable global interrupts*/
+    sei();
+}