mirror of
https://github.com/arduino/Arduino.git
synced 2024-12-11 22:24:13 +01:00
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
|
|
%atmel_license%
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
*
|
|
* Implementation of Watchdog Timer (WDT) controller.
|
|
*
|
|
*/
|
|
|
|
/** \addtogroup wdt_module Working with WDT
|
|
* The WDT driver provides the interface to configure and use the WDT
|
|
* peripheral.
|
|
*
|
|
* The WDT can be used to prevent system lock-up if the software becomes
|
|
* trapped in a deadlock. It can generate a general reset or a processor
|
|
* reset only. It is clocked by slow clock divided by 128.
|
|
*
|
|
* The WDT is running at reset with 16 seconds watchdog period (slow clock at 32.768 kHz)
|
|
* and external reset generation enabled. The user must either disable it or
|
|
* reprogram it to meet the application requires.
|
|
*
|
|
* To use the WDT, the user could follow these few steps:
|
|
* <ul>
|
|
* <li>Enable watchdog with given mode using \ref WDT_Enable().
|
|
* <li>Restart the watchdog using \ref WDT_Restart() within the watchdog period.
|
|
* </ul>
|
|
*
|
|
* For more accurate information, please look at the WDT section of the
|
|
* Datasheet.
|
|
*
|
|
* \note
|
|
* The Watchdog Mode Register (WDT_MR) can be written only once.\n
|
|
*
|
|
* Related files :\n
|
|
* \ref wdt.c\n
|
|
* \ref wdt.h.\n
|
|
*/
|
|
/*@{*/
|
|
/*@}*/
|
|
|
|
/*---------------------------------------------------------------------------
|
|
* Headers
|
|
*---------------------------------------------------------------------------*/
|
|
|
|
#include "chip.h"
|
|
|
|
#include <stdint.h>
|
|
|
|
/*----------------------------------------------------------------------------
|
|
* Exported functions
|
|
*----------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* \brief Enable watchdog with given mode.
|
|
*
|
|
* \note The Watchdog Mode Register (WDT_MR) can be written only once.
|
|
* Only a processor reset resets it.
|
|
*
|
|
* \param dwMode WDT mode to be set
|
|
*/
|
|
extern void WDT_Enable( Wdt* pWDT, uint32_t dwMode )
|
|
{
|
|
pWDT->WDT_MR = dwMode ;
|
|
}
|
|
|
|
/**
|
|
* \brief Disable watchdog.
|
|
*
|
|
* \note The Watchdog Mode Register (WDT_MR) can be written only once.
|
|
* Only a processor reset resets it.
|
|
*/
|
|
extern void WDT_Disable( Wdt* pWDT )
|
|
{
|
|
pWDT->WDT_MR = WDT_MR_WDDIS;
|
|
}
|
|
|
|
/**
|
|
* \brief Watchdog restart.
|
|
*/
|
|
extern void WDT_Restart( Wdt* pWDT )
|
|
{
|
|
pWDT->WDT_CR = 0xA5000001;
|
|
}
|
|
|
|
/**
|
|
* \brief Watchdog get status.
|
|
*/
|
|
extern uint32_t WDT_GetStatus( Wdt* pWDT )
|
|
{
|
|
return (pWDT->WDT_SR & 0x3) ;
|
|
}
|
|
|
|
/**
|
|
* \brief Watchdog get period.
|
|
*
|
|
* \param dwMs desired watchdog period in millisecond.
|
|
*/
|
|
extern uint32_t WDT_GetPeriod( uint32_t dwMs )
|
|
{
|
|
if ( (dwMs < 4) || (dwMs > 16000) )
|
|
{
|
|
return 0 ;
|
|
}
|
|
return ((dwMs << 8) / 1000) ;
|
|
}
|