20191107/string-ops-7.c

-#include <stdio.h>
-#include <string.h>
-
-int main (void)
-{
-  char *anton = "Anton";
-  char *zacharias = "Zacharias";
-
-  printf ("%d\n", strcmp (anton, zacharias));
-  printf ("%d\n", strcmp (zacharias, anton));
-  printf ("%d\n", strcmp (anton, anton));
-
-  char anton2[] = "Anton";
-  if (anton == anton2)
-    printf ("gleich\n");
-  else
-    printf ("ungleich\n");
-/*
-  char buffer[100] = "Huber ";
-  strcat (buffer, anton);
-  printf ("%s\n", buffer);
-*/
-
-  return 0;
-}

20191114/blink-0a.c

-#include <avr/io.h>
-
-int main (void)
-{
-  DDRD = 0x40;   /* binär: 0100 0000 */
-  PORTD = 0x00;  /* binär: 0000 0000 */
-  while (1);
-  return 0;
-}

20191114/blink-10.c

-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <stdint.h>
-
-#define F_CPU 16000000l
-#include <util/delay.h>
-
-volatile uint8_t key_pressed = 0;
-
-ISR (INT0_vect)  /* PD2 */
-{
-  key_pressed = 1;
-}
-
-int main (void)
-{
-  cli ();
-  EICRA = 1 << ISC00 | 1 << ISC01;  /* INT0: steigende Flanke */
-  EIMSK = 1 << INT0;  /* INT0 einschalten */
-  sei ();
-  DDRD = 0xfb;   /* binär: 1111 1011 */
-  PORTD = 0x40;  /* binär: 0100 0000 */
-  while (1)
-    {
-      while (!key_pressed)
-        ;  /* just wait */
-      PORTD ^= 0x40;
-      key_pressed = 0;
-    }
-  return 0;
-}

20191114/blink-11.c

-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <stdint.h>
-
-#define F_CPU 16000000l
-#include <util/delay.h>
-
-volatile uint8_t key_pressed = 0;
-
-ISR (INT0_vect)  /* PD2 */
-{
-  key_pressed = 1;
-}
-
-int main (void)
-{
-  cli ();
-  EICRA = 1 << ISC00 | 1 << ISC01;  /* INT0: steigende Flanke */
-  EIMSK = 1 << INT0;  /* INT0 einschalten */
-  sei ();
-  DDRD = 0xfb;   /* binär: 1111 1011 */
-  PORTD = 0x40;  /* binär: 0100 0000 */
-  while (1)
-    {
-      while (!key_pressed)
-        ;  /* just wait */
-      _delay_ms (1);
-      PORTD ^= 0x40;
-      key_pressed = 0;
-    }
-  return 0;
-}

20191114/blink-8.c

-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <stdint.h>
-
-ISR (INT0_vect)  /* PD2 */
-{
-  PORTD ^= 0x40;
-}
-
-int main (void)
-{
-  cli ();
-  EICRA = 1 << ISC00 | 1 << ISC01;  /* INT0: steigende Flanke */
-  EIMSK = 1 << INT0;  /* INT0 einschalten */
-  sei ();
-  DDRD = 0xff;   /* binär: 1111 1111 */
-  PORTD = 0x40;  /* binär: 0100 0000 */
-  while (1);
-  return 0;
-}

20191114/photo-20191114-172339.txt

-README: Logische und bitweise Und-Verknüpfung (rechts), einzelnes Bit auf 1 setzen (links)

20191114/photo-20191114-172358.txt

-README: Einzelnes Bit auf 1 (rechts) bzw. auf 0 (links) setzen

20191114/photo-20191114-172434.txt

-README: Einzelnes Bit auf 0 setzen (rechts) bzw. umklappen (Mitte) bzw. abfragen (links)

20191121/blink-0a.c

-#include <avr/io.h>
-
-int main (void)
-{
-  DDRD = 0x40;   /* binär: 0100 0000 */
-  PORTD = 0x00;  /* binär: 0000 0000 */
-  while (1);
-  return 0;
-}

20191121/blink-10.c

-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <stdint.h>
-
-#define F_CPU 16000000l
-#include <util/delay.h>
-
-volatile uint8_t key_pressed = 0;
-
-ISR (INT0_vect)  /* PD2 */
-{
-  key_pressed = 1;
-}
-
-int main (void)
-{
-  cli ();
-  EICRA = 1 << ISC00 | 1 << ISC01;  /* INT0: steigende Flanke */
-  EIMSK = 1 << INT0;  /* INT0 einschalten */
-  sei ();
-  DDRD = 0xfb;   /* binär: 1111 1011 */
-  PORTD = 0x40;  /* binär: 0100 0000 */
-  while (1)
-    {
-      while (!key_pressed)
-        ;  /* just wait */
-      PORTD ^= 0x40;
-      key_pressed = 0;
-    }
-  return 0;
-}

20191121/blink-11.c

-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <stdint.h>
-
-#define F_CPU 16000000l
-#include <util/delay.h>
-
-volatile uint8_t key_pressed = 0;
-
-ISR (INT0_vect)  /* PD2 */
-{
-  key_pressed = 1;
-}
-
-int main (void)
-{
-  cli ();
-  EICRA = 1 << ISC00 | 1 << ISC01;  /* INT0: steigende Flanke */
-  EIMSK = 1 << INT0;  /* INT0 einschalten */
-  sei ();
-  DDRD = 0xfb;   /* binär: 1111 1011 */
-  PORTD = 0x60;  /* binär: 0100 0000 */
-  while (1)
-    {
-      while (!key_pressed)
-        ;  /* just wait */
-      _delay_ms (1);
-      PORTD ^= 0x40;
-      key_pressed = 0;
-    }
-  return 0;
-}

20191121/blink-3.c

-#include <avr/io.h>
-
-#define F_CPU 16000000
-#include <util/delay.h>
-
-int main (void)
-{
-  DDRD = 0x01;
-  PORTD = 0x01;
-  while (1)
-    {
-      while ((PIND & 0x02) == 0)
-        ; /* just wait */
-      PORTD ^= 0x01;
-    }
-  return 0;
-}

20191121/blink-5.c

-#include <avr/io.h>
-#include <avr/interrupt.h>
-
-ISR (TIMER0_COMPB_vect)
-{
-  PORTD ^= 0x40;
-}
-
-int main (void)
-{
-  cli ();
-  TCCR0B = (1 << CS01) | (1 << CS00);  /* Takt durch 64 dividieren */
-  TIMSK0 = 1 << OCIE0B;  /* Interrupt einschalten */
-  sei ();
-  DDRD = 0xfd;   /* binär: 1111 1101 */
-  PORTD = 0x40;  /* binär: 0100 0000 */
-  while (1);
-  return 0;
-}

20191121/blink-6.c

-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <stdint.h>
-
-ISR (TIMER0_COMPB_vect)
-{
-  static uint8_t counter = 0;
-  if (counter++ == 0)
-    PORTD ^= 0x40;
-}
-
-int main (void)
-{
-  cli ();
-  TCCR0B = (1 << CS01) | (1 << CS00);  /* Takt durch 64 dividieren */
-  TIMSK0 = 1 << OCIE0B;  /* Interrupt einschalten */
-  sei ();
-  DDRD = 0xfd;   /* binär: 1111 1101 */
-  PORTD = 0x40;  /* binär: 0100 0000 */
-  while (1);
-  return 0;
-}

20191121/blink-7.c

-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <stdint.h>
-
-ISR (INT0_vect)  /* PD2 */
-{
-  PORTD ^= 0x40;
-}
-
-int main (void)
-{
-  cli ();
-  EICRA = 1 << ISC00 | 1 << ISC01;  /* INT0: steigende Flanke */
-  EIMSK = 1 << INT0;  /* INT0 einschalten */
-  sei ();
-  DDRD = 0xfb;   /* binär: 1111 1011 */
-  PORTD = 0x60;  /* binär: 0110 0000 */
-  while (1);
-  return 0;
-}