Initial code

1 files changed, 48 insertions, 0 deletions

diff --git a/hello.c b/hello.c
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index 0000000..e34ba06
--- /dev/null
+++ b/hello.c
@@ -0,0 +1,48 @@
+
+/**
+ *  
+ * Blinking LED ATTiny85 "hello world"
+ *
+ * Following the tutorial at:
+ * http://www.instructables.com/id/Honey-I-Shrunk-the-Arduino-Moving-from-Arduino-t/?ALLSTEPS
+ *  
+ */
+
+#include <avr/io.h>
+// F_CPU frequency to be defined at command line
+#include <util/delay.h>
+
+// LED is on pin 2, PB3
+#define LED      PB3
+#define DELAY_MS 500
+
+int main () {
+	uint8_t high = 0;
+	uint16_t ms = 0;
+
+	// setup LED pin for output in port B's direction register
+	DDRB |= (1 << LED);
+
+	// set LED pin LOW
+	PORTB &= ~(1 << LED);
+
+	while (1) {	
+		high = !high;
+
+		if (high) {
+			// set LED pin HIGH
+			PORTB |= (1 << LED);
+		} else {
+			// set LED pin LOW
+			PORTB &= ~(1 << LED);
+		}
+
+		// delay for 500 ms
+		for (ms = DELAY_MS; ms > 0; ms -= 10) {
+			_delay_ms(10);
+		}
+	}
+
+	return 0;
+}
+