SLIP for AVR on UART1

cpu/avr/slip_uart1.c

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+/*
+ * Copyright (c) 2007, Swedish Institute of Computer Science
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ *
+ * @(#)$Id: slip_uart1.c,v 1.1 2007/02/02 13:13:16 bg- Exp $
+ */
+
+/*
+ * Machine dependent AVR SLIP routines for UART1.
+ */
+
+#include <stdio.h>
+
+#include <avr/interrupt.h>
+
+#include "contiki.h"
+
+#include "dev/slip.h"
+
+static int
+slip_putchar(char c, FILE *stream)
+{
+#define SLIP_END 0300
+  static char debug_frame = 0;
+
+  if (!debug_frame) {		/* Start of debug output */
+    slip_arch_writeb(SLIP_END);
+    slip_arch_writeb('\r'); /* Type debug line == '\r' */
+    debug_frame = 1;
+  }
+
+  slip_arch_writeb((unsigned char)c);
+  
+  /*
+   * Line buffered output, a newline marks the end of debug output and
+   * implicitly flushes debug output.
+   */
+  if (c == '\n') {
+    slip_arch_writeb(SLIP_END);
+    debug_frame = 0;
+  }
+
+  return c;
+}
+
+static FILE slip_stdout =
+FDEV_SETUP_STREAM(slip_putchar, NULL, _FDEV_SETUP_WRITE);
+
+void
+slip_arch_init(unsigned long ubr)
+{
+  u8_t dummy;
+  spl_t s = splhigh();
+
+  UBRR1L = ubr;
+  UBRR1H = ubr >> 8;		/* Always zero */
+
+  UCSR1C = BV(UCSZ1) | BV(UCSZ0); /* 1 start bit, no parity, 1 stop bit */
+  UCSR1B = BV(RXEN) | BV(TXEN) | BV(RXCIE);
+  dummy = UDR1;			/* Flush RX buffer. */
+
+  splx(s);
+
+  stdout = &slip_stdout;
+}
+
+void
+slip_arch_writeb(unsigned char c)
+{
+  while (!(UCSR1A & BV(UDRE1)))
+    ;
+  UDR1 = c;
+}
+
+ISR(SIG_UART1_RECV)
+{
+  /* Should deal with receive errors. */
+  slip_input_byte(UDR1);
+}