added 3.2

Microcontrollers/opdracht 3.2/main.c

@@ -0,0 +1,70 @@
+/*
+ * counter_t2_interrupt.c
+ *
+ * Created: 21/02/2021 13:00:25
+ * Author : Etienne
+ */ 
+
+#define F_CPU 8e6
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include "lcd_control.h"
+
+#define BIT(x)			(1 << (x))
+
+// wait(): busy waiting for 'ms' millisecond
+// Used library: util/delay.h
+void wait( int ms ) {
+	for (int tms=0; tms<ms; tms++) {
+		_delay_ms( 1 );			// library function (max 30 ms at 8MHz)
+	}
+}
+
+char * toArray(int number)
+{
+	int n = log10(number) + 1;
+	int i;
+	char *numberArray = calloc(n, sizeof(char));
+	for (i = n-1; i >= 0; --i, number /= 10)
+	{
+		numberArray[i] = (number % 10) + '0';
+	}
+	return numberArray;
+}
+
+volatile int TimerPreset = -1;  // 0xF6, 10 till overflow
+volatile int number = 0;
+
+// Interrupt routine timer2 overflow
+ISR( TIMER2_OVF_vect ) {
+	TCNT2 = TimerPreset;	// Preset value
+	number++;		// Increment counter
+	lcd_clear();
+	lcd_write_character(toArray(number));
+}
+
+// Initialize timer2
+void timer2Init( void ) {
+	TCNT2 = TimerPreset;	// Preset value of counter 2
+	TIMSK |= BIT(6);		// T2 overflow interrupt enable
+	sei();				// turn_on intr all
+	TCCR2 = 0x07;		// Initialize T2: ext.counting, rising edge, run
+}
+
+int main(void) {
+	
+	DDRD &= ~BIT(7);		// PD7 op input: DDRD=xxxx xxx0
+	DDRA = 0xFF;			// set PORTA for output (shows countregister)
+	DDRB = 0xFF;			// set PORTB for output (shows tenthvalue)
+	
+	init_4bits_mode();
+	
+	timer2Init();
+
+	while (1) {
+		PORTA = TCNT2;		// show value counter 2
+		PORTB = number;	// show value tenth counter
+		wait(10);
+	}
+}