From 0749293423c867618d3f16285ea23cf31fd7b111 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Mon, 15 Feb 2016 23:44:13 +0100
Subject: added serialio support for arduino

---
 lib/serialio.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

(limited to 'lib/serialio.c')

diff --git a/lib/serialio.c b/lib/serialio.c
index fde2935..1f00be8 100644
--- a/lib/serialio.c
+++ b/lib/serialio.c
@@ -20,10 +20,78 @@
  *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <avr/io.h>
 #include <stdio.h>
 
 #include "serialio.h"
+
+#ifdef USES_LUFA
 #include "LUFA/Drivers/Peripheral/Serial.h"
+#else
+#define SERIAL_UBBRVAL(Baud)    ((((F_CPU / 16) + (Baud / 2)) / (Baud)) - 1)
+#define SERIAL_2X_UBBRVAL(Baud) ((((F_CPU /  8) + (Baud / 2)) / (Baud)) - 1)
+
+static inline void Serial_Init(const uint32_t BaudRate, const uint8_t DoubleSpeed)
+{
+  UBRR0  = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate));
+
+  UCSR0C = ((1 << UCSZ01) | (1 << UCSZ00));
+  UCSR0A = (DoubleSpeed ? (1 << U2X0) : 0);
+  UCSR0B = ((1 << TXEN0)  | (1 << RXEN0));
+
+  DDRD  |= (1 << 1);
+  PORTD |= (1 << 0);
+}
+
+static inline uint8_t Serial_IsSendReady(void)
+{
+  return ((UCSR0A & (1 << UDRE0)) ? 1 : 0);
+}
+
+static inline void Serial_SendByte(const char DataByte)
+{
+  while (!(Serial_IsSendReady()));
+  UDR0 = DataByte;
+}
+
+int Serial_putchar(char DataByte, FILE *Stream)
+{
+	(void)Stream;
+
+	Serial_SendByte(DataByte);
+	return 0;
+}
+
+static inline uint8_t Serial_IsCharReceived(void)
+{
+  return ((UCSR0A & (1 << RXC0)) ? 1 : 0);
+}
+
+static inline int16_t Serial_ReceiveByte(void)
+{
+  if (!(Serial_IsCharReceived()))
+    return -1;
+
+  return UDR0;
+}
+
+int Serial_getchar(FILE *Stream)
+{
+	(void)Stream;
+
+	if (!(Serial_IsCharReceived()))
+	  return _FDEV_EOF;
+
+	return Serial_ReceiveByte();
+}
+
+void Serial_CreateStream(FILE* Stream)
+{
+	*Stream = (FILE)FDEV_SETUP_STREAM(Serial_putchar, Serial_getchar, _FDEV_SETUP_RW);
+}
+#endif
+
+
 
 static FILE serial_stream;
 
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