P5 initial

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);
+}