adjust root folder

ports/arduino_uno/uart.c

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+/**
+ * @file
+ * @author Miguel Fernandes <miguelandre.fernandes@gmail.com>
+ * @date 6 de Jun de 2013
+ * @brief For redirecting stdout, stdin and stderr
+ *  see http://www.appelsiini.net/2011/simple-usart-with-avr-libc
+ */
+#include <stdbool.h>
+#include <stdint.h>
+#include <avr/io.h>
+#include <util/setbaud.h>
+#include "hardware.h"
+#include "uart.h"
+
+void uart_init(void)
+{
+    UBRR0H = UBRRH_VALUE;
+    UBRR0L = UBRRL_VALUE;
+
+#if USE_2X
+    UCSR0A |= _BV(U2X0);
+#else
+    UCSR0A &= ~(_BV(U2X0));
+#endif
+
+    UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); /* 8-bit data */
+    UCSR0B = _BV(RXEN0) | _BV(TXEN0);   /* Enable RX and TX */
+}
+
+void uart_putchar(char c,
+    FILE * stream)
+{
+    if (c == '\n') {
+        uart_putchar('\r', stream);
+    }
+    loop_until_bit_is_set(UCSR0A, UDRE0);
+    UDR0 = c;
+}
+
+char uart_getchar(FILE * stream)
+{
+    loop_until_bit_is_set(UCSR0A, RXC0);        /* Wait until data exists. */
+    return UDR0;
+}