Matthias
6cc948eef8
git-svn-id: file:///srv/dev-disk-by-uuid-17e88007-4d0c-45e0-8757-cacfcc458630/repositories/svn/Diplomarbeit@113 9fe90eed-be63-e94b-8204-d34ff4c2ff93
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/* ---------------------------------------------------------------------------
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* watchdog.c - v0.1 (c) 2007 Micro-key bv
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* ---------------------------------------------------------------------------
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* Micro-key bv
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* Industrieweg 28, 9804 TG Noordhorn
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* Postbus 92, 9800 AB Zuidhorn
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* The Netherlands
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* Tel: +31 594 503020
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* Fax: +31 594 505825
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* Email: support@microkey.nl
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* Web: www.microkey.nl
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* ---------------------------------------------------------------------------
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* Description: Watchdog funcitonality
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* ---------------------------------------------------------------------------
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* Version(s): 0.1, 28-11-2007, fvds.
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* Creation.
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* System include files
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* Application include files
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* ---------------------------------------------------------------------------
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*/
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#include "LPC23xx.h"
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#include "types.h"
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#include "watchdog.h"
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/* FreeRTOS includes */
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#include "FreeRTOS.h"
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/* ---------------------------------------------------------------------------
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* Local constant and macro definitions
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* ---------------------------------------------------------------------------
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*/
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#define WD_CLKSRC_APB (0x01)
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#define WD_CLKSRC_IRC_OSC (0x00)
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#define WD_EN (0x01)
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#define WD_RESET (0x02)
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#define WD_WTOF (0x04)
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/* ---------------------------------------------------------------------------
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* Global variable definitions
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* Local variable definitions
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* ---------------------------------------------------------------------------
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*/
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static INT16 WtofStatus = -1;
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/* ---------------------------------------------------------------------------
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* Local function definitions
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* ---------------------------------------------------------------------------
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*/
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/** \brief Enable the watchdog */
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void watchdogEnable(
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UINT16 resetTime /**< Time in ms till watchdog will reset target when not fed in meantime */
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)
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{
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UINT32 prescaleFeedValue;
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// Make sure the WD_WTOF is stored
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watchdogCausedReset();
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// Internal RC oscilator runs on 4 Mhz, the prescale is calculated by:
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// 1 resetTime
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// ------------ * 4 * prescaleFeedValue = (-----------) (seconden)
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// 4.000.000 1000
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//
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//
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prescaleFeedValue = resetTime * 1000;
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WDTC = prescaleFeedValue; /* once WDEN is set, the WDT will start after feeding */
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WDMOD = WD_EN | WD_RESET;
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WDFEED = 0xAA; /* Feeding sequence */
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WDFEED = 0x55;
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}
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/** \brief Feed the watchdog in order to prevent a reset */
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void watchdogFeed()
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{
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WDFEED = 0xAA; /* Feeding sequence */
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WDFEED = 0x55;
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}
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BOOLEAN watchdogCausedReset()
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{
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if ( WtofStatus < 0)
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{
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WtofStatus = ((WDMOD & WD_WTOF) == WD_WTOF ? 1 : 0);
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// Clear bit
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WDMOD &= ~WD_WTOF;
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}
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return (WtofStatus == 1 ? TRUE : FALSE);
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}
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