From 9a5753f23fb7d55a7a72c8cf9846cc72349c65de Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <lars@6xq.net>
Date: Thu, 13 Feb 2014 16:45:48 +0100
Subject: Split up main.c

---
 uart.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 uart.c

(limited to 'uart.c')

diff --git a/uart.c b/uart.c
new file mode 100644
index 0000000..4b7ca39
--- /dev/null
+++ b/uart.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <avr/io.h>
+
+#include "uart.h"
+
+/* blocking uart send
+ */
+static void uartSend (unsigned char data) {
+	/* Wait for empty transmit buffer */
+	while (!( UCSR0A & (1<<UDRE0)));
+	/* Put data into buffer, sends the data */
+	UDR0 = data;
+}
+
+static int uartPutc (char c, FILE *stream) {
+	if (c == '\n') {
+		uartSend ('\r');	
+	}
+	uartSend (c);
+	return 0;
+}
+
+static FILE mystdout = FDEV_SETUP_STREAM (uartPutc, NULL, _FDEV_SETUP_WRITE);
+
+void uartInit () {
+	/* Set baud rate (9600, double speed, at 1mhz) */
+	UBRR0H = 0;
+	UBRR0L = 12;
+	/* enable double speed mode */
+	UCSR0A = (1 << U2X0);
+	/* Enable receiver and transmitter */
+	UCSR0B = (1<<RXEN0)|(1<<TXEN0);
+	/* Set frame format: 8 data, 1 stop bit, even parity */
+	UCSR0C = (1<<UPM01) | (0 << UPM00) | (0<<USBS0)|(3<<UCSZ00);
+
+	/* redirect stdout */
+	stdout = &mystdout;
+}
+
+static unsigned char uartReceive () {
+	/* Wait for data to be received */
+	while ( !(UCSR0A & (1<<RXC0)) );
+	/* Get and return received data from buffer */
+	return UDR0;
+}
+
-- 
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