Added a Contiki clock_time() implementation based on the cc65 clock() implementation.

cpu/6502/6502-conf.h

@@ -13,6 +13,9 @@ typedef unsigned short uip_stats_t;
 #define CCIF
 #define CLIF
 
+#define CLOCK_CONF_SECOND 2
+typedef unsigned short clock_time_t;
+
 #define UIP_ARCH_ADD32  1
 #define UIP_ARCH_CHKSUM 1
 

cpu/6502/Makefile.6502

@@ -30,7 +30,7 @@
 #
 # Author: Oliver Schmidt <ol.sc@web.de>
 #
-# $Id: Makefile.6502,v 1.9 2007/05/19 07:55:35 oliverschmidt Exp $
+# $Id: Makefile.6502,v 1.10 2007/05/29 21:56:21 oliverschmidt Exp $
 #
 
 ifndef CONTIKI
@@ -54,7 +54,7 @@ CONTIKI_CPU_DIRS    = . net sys
 CONTIKI_TARGET_MAIN = ${addprefix $(OBJECTDIR)/,contiki-main.o}
 
 CONTIKI_TARGET_SOURCEFILES = contiki-main.c
-CONTIKI_CPU_SOURCEFILES    = mtarch.c mtarch-asm.S lc-asm.S uip_arch.c
+CONTIKI_CPU_SOURCEFILES    = clock.c mtarch.c mtarch-asm.S lc-asm.S uip_arch.c
 
 CONTIKI_SOURCEFILES += $(CONTIKI_CPU_SOURCEFILES) $(CONTIKI_TARGET_SOURCEFILES)
 

cpu/6502/clock.c

@@ -0,0 +1,55 @@
+/*
+ * 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. 
+ *
+ * This file is part of the Contiki operating system.
+ * 
+ * Author: Oliver Schmidt <ol.sc@web.de>
+ *
+ * $Id: clock.c,v 1.1 2007/05/29 21:56:22 oliverschmidt Exp $
+ */
+
+#include <time.h>
+
+#include "contiki.h"
+
+clock_time_t
+clock_time(void)
+{
+  /* Contiki contains quite some calculations based on clock_time_t so we want
+   * to avoid defining clock_time_t to be 32 bit because that would mean a lot
+   * of overhead for cc65 targets.
+   * On the other hand we want to avoid wrapping around frequently so the idea
+   * is to reduce the clock resolution to the bare minimum. This is defined by
+   * the TCP/IP stack using a 1/2 second periodic timer. So CLOCK_CONF_SECOND
+   * needs to be defined at least as 2.
+   * The value 2 works out especially nicely as it allows us to implement the
+   * clock frequency devider below purely in (32 bit) integer arithmetic based
+   * on the educated guess of CLK_TCK being an even value.
+   */
+  return clock() / (CLK_TCK / CLOCK_CONF_SECOND);
+}