Beispielprogramme und Tafelbild 4.12.2017

20171204/blink-4a.c

+#include <avr/io.h>
+
+#define F_CPU 16000000
+#include <util/delay.h>
+
+int main (void)
+{
+  DDRD = 0x01;   /* 00000001 */
+  PORTD = 0x03;  /* 00000011 */
+  while (1)
+    {
+      while ((PIND & 0x02) == 0)
+        ; /* just wait */
+      PORTD ^= 0x01;
+      _delay_ms (200);
+    }
+  return 0;
+}

20171204/blink-4b.c

+#include <avr/io.h>
+
+#define F_CPU 16000000
+#include <util/delay.h>
+
+int main (void)
+{
+  DDRD = 0x01;   /* 00000001 */
+  PORTD = 0x03;  /* 00000011 */
+  while (1)
+    ;  /* just wait */
+  return 0;
+}

20171204/blink-4c.c

+#include <avr/io.h>
+
+#define F_CPU 16000000
+#include <util/delay.h>
+
+int main (void)
+{
+  DDRD = 0x01;   /* 00000001 */
+  PORTD = 0x03;  /* 00000011 */
+  while (1)
+    {
+      _delay_ms (500);
+      PORTD ^= 0x02;
+    }
+  return 0;
+}

20171204/blink-6a.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 */
+  cli ();
+  while (1);
+  return 0;
+}

20171204/photo-20171204-170812.txt

+README: Pull-Down- und Pull-Up-Widerstände

20171204/upload.sh

-echo avrdude -P /dev/ttyACM0 -c arduino -p m328p -U flash:w:$(ls -rt *.hex | tail -1)
-avrdude -P /dev/ttyACM0 -c arduino -p m328p -U flash:w:$(ls -rt *.hex | tail -1) 2>/dev/null
+port=$(ls -rt /dev/ttyACM* | tail -1)
+echo avrdude -P $port -c arduino -p m328p -U flash:w:$(ls -rt *.hex | tail -1)
+avrdude -P $port -c arduino -p m328p -U flash:w:$(ls -rt *.hex | tail -1) 2>/dev/null