P5 initial

Abgaben/P4/keys.c

@@ -0,0 +1,34 @@
+#include "keys.h"
+
+void setupTimer0() {
+	// Configure Timer0 for CTC mode
+	TCCR0A |= (1 << WGM01);                 // Set Waveform Generation Mode bits for CTC
+	TCCR0B |= (1 << CS01) | (1 << CS00);    // Set prescaler to 64
+	OCR0A = 249;                            // Set Output Compare Register to 249 for ~1ms interrupt
+	TIMSK0 |= (1 << OCIE0A);                // Enable Timer0 Output Compare A Match interrupt
+}
+
+void setupRegisters(){
+		DDRD = 0xff;										// Data direction register D (D0 -> D6) as output
+		// PORTD = 0xff;									// setting bit for 7-segment show 0
+		// => spielt keine Rolle, wird von der while Schleife <20>bernommen
+		
+		DDRB = 0x01;										// Data direction register B (B0) as output and DDRB (B1, B2) as input
+		PORTB |= (1 << PINB1) | (1 << PINB2) ;				// setting bit for teens B0=0 and SW1-2
+		// PINB=0 => start with LED3 (Einer)
+		
+		// mit unserem Atmega nicht m<>glich, da keine PCINT8_vect und PCINT9_vect vorhanden
+		// DDRC = 0x00;										// Data direction register C as input for SW1 and SW2
+		// PORTC |= (1<<PINC0) | (1<<PINC1);					// settings pins for SW1 -> PINC0 and SW2 -> PINC1
+		
+		cli();												// clear global interrupt flag: interrupts will be immediately disabled
+		PCICR |= 0x01;										// Pin Change Interrupt Control Register: turn on PortB
+		PCMSK0 |= (1 << PINB1) | (1 << PINB2);				// trigger interrupt when SW1 or SW2 is pressed
+		sei();												// set global interrupt enable
+
+}
+
+void init(){
+	setupTimer0();
+	setupRegisters();
+}

Abgaben/P4/keys.h

@@ -0,0 +1,12 @@
+#ifndef KEYS_H_
+#define KEYS_H_
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+void setupTimer0();
+void setupRegisters();
+void init();
+
+
+#endif /* KEYS_H_ */

Abgaben/P4/main.c

@@ -0,0 +1,12 @@
+#include "keys.h"
+#include "sevenseg.h"
+
+int main(void) {
+	init();
+	
+	while(1) {
+		display();
+	}
+}
+
+

Abgaben/P4/sevenseg.c

@@ -0,0 +1,71 @@
+#include "sevenseg.h"
+
+//-Timer---------------------------------------
+
+volatile uint32_t systemClock = 0;
+
+ISR(TIMER0_COMPA_vect) {
+	systemClock++;  
+}
+
+uint32_t getSystemClock(){
+	return systemClock;
+}
+
+void waitFor(uint32_t ms) {
+	uint32_t endTime = getSystemClock() + ms;
+	while (getSystemClock() != endTime);
+}
+
+//-Counter-------------------------------------
+
+volatile int count = 0;
+
+ISR(PCINT0_vect) {											// every 10ms interrupt is triggered
+	
+	if (!(PINB & (1<<PINB1))) {								// count down => sw1 is pressed
+		if (count == 0) count = 100;						// 100 - 1 = 99
+		count--;
+	}
+	
+	if (!(PINB & (1<<PINB2))) {								// count up => sw2 is pressed
+		if (count == 99) count = -1;						// -1 + 1 = 0
+		count++;
+	}
+}
+
+//-Display--------------------------------------
+
+void display() {
+	/*
+	logical 0: on
+	logical 1: off
+
+		.gfe dcba	HEX	int
+	0 : 1100 0000 = C0	192
+	1 : 1111 1001 = F9	249
+	2 : 1010 0100 = A4	164
+	3 :	1011 0000 = 30	48
+	4 : 1001 1001 = 99	153
+	5 : 1001 0010 = 92	146
+	6 : 1000 0010 = 82	130
+	7 : 1111 1000 = F8	248
+	8 : 1000 0000 = 80	128
+	9 : 1001 0000 = 90	144
+	*/
+
+	int numbersAsSegments[10] = { 192, 249, 164, 48, 153, 146, 130, 248, 128, 144 };		// display number from 0 to 9;
+	
+	volatile int led_Einer = numbersAsSegments[(int) count % 10];							// Segmentanzeige f<>r Zehner
+	volatile int led_Zehner =  numbersAsSegments[(int) (count - (count % 10)) / 10];		// Segmentanzeige f<>r Einer
+	
+	PORTD = led_Einer;
+	//_delay_ms(10);
+	waitFor(10);
+	PORTB ^= (1 << PINB0);
+	
+	PORTD = led_Zehner;
+	//_delay_ms(10);
+	waitFor(10);
+	PORTB ^= (1 << PINB0);
+}

Abgaben/P4/sevenseg.h

@@ -0,0 +1,12 @@
+#ifndef SEVENSEG_H_
+#define SEVENSEG_H_
+#define F_CPU 16000000UL    // 16MHz clock frequency
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include "avr/io.h"
+
+uint32_t getSystemClock();
+void waitFor(uint32_t ms);
+void display();
+
+#endif /* SEVENSEG_H_ */