Add the wdt avr cpu specific.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@1950 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/cpu/avr/drv/wdt_avr.h b/bertos/cpu/avr/drv/wdt_avr.h
new file mode 100644 (file)
index 0000000..109390e
--- /dev/null
+++ b/bertos/cpu/avr/drv/wdt_avr.h
@@ -0,0 +1,100 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2004 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Watchdog interface for AVR architecture.
+ *
+ * \version $Id$
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ */
+
+#ifndef DRV_WDT_AVR_H
+#define DRV_WDT_AVR_H
+
+#include "cfg/cfg_wdt.h"
+
+#include <cfg/compiler.h> // INLINE
+
+#include <avr/io.h>
+
+#if CPU_AVR_ATMEGA1281
+       #define WDT_CRTL_REG WDTCSR
+#else
+       #define WDT_CRTL_REG WDTCR
+#endif
+
+/**
+ * Reset the watchdog timer.
+ */
+INLINE void wdt_reset(void)
+{
+       __asm__ __volatile__ ("wdr");
+}
+
+INLINE void wdt_enable(bool flag)
+{
+       IRQ_DISABLE;
+       if (flag)
+       {
+               WDT_CRTL_REG |= BV(WDE);
+       }
+       else
+       {
+               WDT_CRTL_REG |= BV(WDCE) | BV(WDE);
+               WDT_CRTL_REG &= ~BV(WDE);
+       }
+       IRQ_ENABLE;
+}
+
+/**
+ * Set watchdog timeout.
+ */
+INLINE void wdt_setTimeout(uint32_t timeout)
+{
+       IRQ_DISABLE;
+       wdt_reset();
+       WDT_CRTL_REG |= BV(WDCE) | BV(WDE);
+       WDT_CRTL_REG = timeout;
+       IRQ_ENABLE;
+}
+
+/**
+ * Init watchdog timer.
+ */
+INLINE void wdt_init(void)
+{
+       WDT_CRTL_REG |= BV(WDCE) | BV(WDE);
+}
+
+
+#endif /* DRV_WDT_AVR_H */