From bd646534b07bbf3c22a4d2ec01d800b0ad718aa6 Mon Sep 17 00:00:00 2001
From: asterix <asterix@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Tue, 2 Dec 2008 13:41:22 +0000
Subject: [PATCH] Use avr libc for wdt cpu specific. Comply the wdt interface
 function. Clean code.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@1953 38d2e660-2303-0410-9eaa-f027e97ec537
---
 bertos/cpu/avr/drv/wdt_avr.h | 68 +++++++++++++++++-------------------
 bertos/drv/wdt.h             | 31 +++++-----------
 2 files changed, 42 insertions(+), 57 deletions(-)

diff --git a/bertos/cpu/avr/drv/wdt_avr.h b/bertos/cpu/avr/drv/wdt_avr.h
index 109390eb..0edb5d16 100644
--- a/bertos/cpu/avr/drv/wdt_avr.h
+++ b/bertos/cpu/avr/drv/wdt_avr.h
@@ -32,6 +32,10 @@
  *
  * \brief Watchdog interface for AVR architecture.
  *
+ * \note The AVR LibC already provvide the api to manange
+ * the watchdog on AVR architecture. In LibC also define several
+ * macro to set the timeout value (see documentation for more detail).
+ *
  * \version $Id$
  *
  * \author Daniele Basile <asterix@develer.com>
@@ -46,54 +50,48 @@
 #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
+#include <avr/wdt.h>
 
 /**
  * Reset the watchdog timer.
+ *
+ * This functions is already definded to avr libc,
+ * we use it.
  */
-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;
-}
+// void wdt_reset(void)
 
 /**
- * Set watchdog timeout.
+ * Start the watchdog timer that fire at the select
+ * timeout.
+ *
+ * \param timeout, you can use the macro that are defineded in
+ * avr/wdt.h.
+ *
+ * (from avr libc documentation)
+ * WDTO_15MS
+ * WDTO_30MS
+ * WDTO_60MS
+ * WDTO_120MS
+ * WDTO_250MS
+ * WDTO_500MS
+ * WDTO_1S
+ * WDTO_2S
+ * WDTO_4S
+ * WDTO_8S
  */
-INLINE void wdt_setTimeout(uint32_t timeout)
+INLINE void wdt_start(uint32_t _timeout)
 {
-	IRQ_DISABLE;
-	wdt_reset();
-	WDT_CRTL_REG |= BV(WDCE) | BV(WDE);
-	WDT_CRTL_REG = timeout;
-	IRQ_ENABLE;
+	uint8_t timeout = _timeout;
+
+	wdt_enable(timeout);
 }
 
 /**
- * Init watchdog timer.
+ * Stop watchdog timer.
  */
-INLINE void wdt_init(void)
+INLINE void wdt_stop(void)
 {
-	WDT_CRTL_REG |= BV(WDCE) | BV(WDE);
+	wdt_disable();
 }
 
 
diff --git a/bertos/drv/wdt.h b/bertos/drv/wdt.h
index 0cb221c3..6e2cde30 100644
--- a/bertos/drv/wdt.h
+++ b/bertos/drv/wdt.h
@@ -66,8 +66,8 @@
 #endif /* CONFIG_WATCHDOG */
 
 
-
 #if OS_HOSTED || !CONFIG_WATCHDOG
+
 	/**
 	 * Reset the watchdog timer.
 	 */
@@ -86,11 +86,13 @@
 	}
 
 	/**
-	 * Set watchdog timer timeout.
+	 * Start the watchdog timer that fire at the select
+	 * timeout.
 	 *
-	 * \param timeout  0: 16.3ms, 7: 2.1s
+	 * \param timeout, this value is target dependant.
+	 * See the target documentation for more detail.
 	 */
-	INLINE void wdt_init(uint8_t timeout)
+	INLINE void wdt_start(uint32_t timeout)
 	{
 	#if CONFIG_WATCHDOG
 		#if OS_QT
@@ -103,29 +105,14 @@
 			(void)timeout;
 		#elif OS_POSIX
 			(void)timeout; // NOP
-		#else
-			#error unknown CPU
 		#endif
 	#endif /* CONFIG_WATCHDOG */
-		(void)timeout;
-	}
-
-	INLINE void wdt_start(void)
-	{
-#if CONFIG_WATCHDOG
-		#if OS_QT
-			// NOP
-		#elif OS_POSIX
-			// NOP
-		#else
-			#error unknown CPU
-		#endif
-#endif /* CONFIG_WATCHDOG */
+		(void)timeout; // NOP
 	}
 
 	INLINE void wdt_stop(void)
 	{
-#if CONFIG_WATCHDOG
+	#if CONFIG_WATCHDOG
 		#if OS_QT
 			// NOP
 		#elif OS_POSIX
@@ -133,7 +120,7 @@
 		#else
 			#error unknown CPU
 		#endif
-#endif /* CONFIG_WATCHDOG */
+	#endif /* CONFIG_WATCHDOG */
 	}
 #endif /* OS_HOSTED || !CONFIG_WATCHDOG */
 
-- 
2.25.1