Restructured

Electronics/Avr2011_LED_Demo.c.md

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+Cut and paste the following into a file called LED_Demo.c
+
+    /* Blinker Demo */
+
+    #include <avr/io.h>     /* Defines pins, ports, etc */
+    #define F_CPU 8000000UL         /* Sets up the chip speed for delay.h */
+    #include <util/delay.h>     /* Functions to waste time */
+
+    #define LED  PB0        /* Defines pin PB0 for the LED.  I
+                     often include a bunch of the circuit
+                     info in the code this way, which
+                     makes porting the code to another
+                     chip easier and reminds you of how to
+                     hook it up. */
+
+    void main(void){
+
+      DDRB = _BV(LED);            /* Data Direction Register B:
+                           writing a one to the bit
+                           enables output.  More on the
+                           _BV() macro in the next
+                           lesson. */
+
+      while(1){         /* the main loop, from which we never return */
+
+        PORTB = _BV(LED);       /* Turn on the LED bit/pin in PORTB */
+        _delay_ms(400);     /* wait */
+
+        PORTB = 0;             /* Turn off everything(!) on PORTB */
+       _delay_ms(400);      /* wait */
+
+      }
+    }
+
+[Category:Microcontrollers](Category:Microcontrollers "wikilink")