Asynchronous UART example.

hello_uart_async/main.c

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+/*
+ * Test how to use uart stuff as an outside library. Redirects stdout
+ * to uart.
+ * 
+ * Led at Arduino digital 13 (PORTB5). Cause we all love blinken leds!
+ *
+ * To compile and upload run: make clean; make; make program;
+ * Connect to serial with: screen /dev/tty.usbserial-* 9600
+ *
+ * Copyright 2011 Mika Tuupola
+ *
+ * Licensed under the MIT license:
+ *   http://www.opensource.org/licenses/mit-license.php
+ *
+ */
+ 
+#ifndef F_CPU
+#define F_CPU 16000000UL
+#endif
+
+//#include <stdlib.h>
+#include <avr/io.h>
+#include <stdio.h>
+#include <util/delay.h>
+
+#include "main.h"
+#include "uart.h"
+
+int main(void) {    
+
+    uart_init();
+    stdout = &uart_output;
+    stdin  = &uart_input;
+                
+    while (1) {
+        /* Blink led by toggling state of PORTB5 (Arduino digital 13). */
+        PORTB ^= _BV(PORTB5);
+        
+        puts("Hello async world!");
+        
+        _delay_ms(500);    
+    }
+    
+    return 0;
+
+}