Beispielprogramme für Mikrocontrollerprogrammierung

20171120/Makefile

+%.elf: %.c
+	avr-gcc -Wall -Os -c -mmcu=atmega328p $< -o $@
+
+%.hex: %.elf
+	avr-objcopy -O ihex $< $@
+
+upload:
+	avrdude -P /dev/ttyACM0 -c arduino -p m16 \
+	        -U flash:w:$(ls -rt *.hex | tail -1)

20171120/blink-0.c

+#include <avr/io.h>
+
+int main (void)
+{
+  DDRD = 0x0f;   /* binär: 0000 1111 */
+  PORTD = 0x01;  /* binär: 0000 0001 */
+  while (1);
+  return 0;
+}

20171120/blink-1.c

+#include <avr/io.h>
+
+#define F_CPU 16000000l
+#include <util/delay.h>
+
+int main (void)
+{
+  DDRD = 0x0f;
+  PORTD = 0x01;
+  while (1)
+    {
+      _delay_ms (500);
+      PORTD &= ~0x01;
+      _delay_ms (500);
+      PORTD |= 0x01;
+    }
+  return 0;
+}

20171120/blink-2.c

+#include <avr/io.h>
+
+#define F_CPU 16000000l
+#include <util/delay.h>
+
+int main (void)
+{
+  DDRD = 0x0f;
+  PORTD = 0x01;
+  while (1)
+    {
+      _delay_ms (500);
+      PORTD ^= 0x01;
+    }
+  return 0;
+}

20171120/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;
+}