wdt_a.h

//*****************************************************************************
//
// wdt_a.h - Driver for the WDT_A Module.
//
//*****************************************************************************

#ifndef __MSP430WARE_WDT_A_H__
#define __MSP430WARE_WDT_A_H__

#include "inc/hw_memmap.h"

#ifdef __MSP430_HAS_WDT_A__

//*****************************************************************************
//
// If building with a C++ compiler, make all of the definitions in this header
// have a C binding.
//
//*****************************************************************************
#ifdef __cplusplus
extern "C"
{
#endif

//*****************************************************************************
//
// The following are values that can be passed to the clockSelect parameter for
// functions: WDT_A_initWatchdogTimer(), and WDT_A_initIntervalTimer().
//
//*****************************************************************************
#define WDT_A_CLOCKSOURCE_SMCLK                                     (WDTSSEL_0)
#define WDT_A_CLOCKSOURCE_ACLK                                      (WDTSSEL_1)
#define WDT_A_CLOCKSOURCE_VLOCLK                                    (WDTSSEL_2)
#define WDT_A_CLOCKSOURCE_XCLK                                      (WDTSSEL_3)

//*****************************************************************************
//
// The following are values that can be passed to the clockDivider parameter
// for functions: WDT_A_initWatchdogTimer(), and WDT_A_initIntervalTimer().
//
//*****************************************************************************
#define WDT_A_CLOCKDIVIDER_2G                                         (WDTIS_0)
#define WDT_A_CLOCKDIVIDER_128M                                       (WDTIS_1)
#define WDT_A_CLOCKDIVIDER_8192K                                      (WDTIS_2)
#define WDT_A_CLOCKDIVIDER_512K                                       (WDTIS_3)
#define WDT_A_CLOCKDIVIDER_32K                                        (WDTIS_4)
#define WDT_A_CLOCKDIVIDER_8192                                       (WDTIS_5)
#define WDT_A_CLOCKDIVIDER_512                                        (WDTIS_6)
#define WDT_A_CLOCKDIVIDER_64                                         (WDTIS_7)

//*****************************************************************************
//
// Prototypes for the APIs.
//
//*****************************************************************************

//*****************************************************************************
//
//! \brief Holds the Watchdog Timer.
//!
//! This function stops the watchdog timer from running, that way no interrupt
//! or PUC is asserted.
//!
//! \param baseAddress is the base address of the WDT_A module.
//!
//! \return None
//
//*****************************************************************************
extern void WDT_A_hold(uint16_t baseAddress);

//*****************************************************************************
//
//! \brief Starts the Watchdog Timer.
//!
//! This function starts the watchdog timer functionality to start counting
//! again.
//!
//! \param baseAddress is the base address of the WDT_A module.
//!
//! \return None
//
//*****************************************************************************
extern void WDT_A_start(uint16_t baseAddress);

//*****************************************************************************
//
//! \brief Resets the timer counter of the Watchdog Timer.
//!
//! This function resets the watchdog timer to 0x0000h.
//!
//! \param baseAddress is the base address of the WDT_A module.
//!
//! \return None
//
//*****************************************************************************
extern void WDT_A_resetTimer(uint16_t baseAddress);

//*****************************************************************************
//
//! \brief Sets the clock source for the Watchdog Timer in watchdog mode.
//!
//! This function sets the watchdog timer in watchdog mode, which will cause a
//! PUC when the timer overflows. When in the mode, a PUC can be avoided with a
//! call to WDT_A_resetTimer() before the timer runs out.
//!
//! \param baseAddress is the base address of the WDT_A module.
//! \param clockSelect is the clock source that the watchdog timer will use.
//!        Valid values are:
//!        - \b WDT_A_CLOCKSOURCE_SMCLK [Default]
//!        - \b WDT_A_CLOCKSOURCE_ACLK
//!        - \b WDT_A_CLOCKSOURCE_VLOCLK
//!        - \b WDT_A_CLOCKSOURCE_XCLK
//!        \n Modified bits are \b WDTSSEL of \b WDTCTL register.
//! \param clockDivider is the divider of the clock source, in turn setting the
//!        watchdog timer interval.
//!        Valid values are:
//!        - \b WDT_A_CLOCKDIVIDER_2G
//!        - \b WDT_A_CLOCKDIVIDER_128M
//!        - \b WDT_A_CLOCKDIVIDER_8192K
//!        - \b WDT_A_CLOCKDIVIDER_512K
//!        - \b WDT_A_CLOCKDIVIDER_32K [Default]
//!        - \b WDT_A_CLOCKDIVIDER_8192
//!        - \b WDT_A_CLOCKDIVIDER_512
//!        - \b WDT_A_CLOCKDIVIDER_64
//!        \n Modified bits are \b WDTIS and \b WDTHOLD of \b WDTCTL register.
//!
//! \return None
//
//*****************************************************************************
extern void WDT_A_initWatchdogTimer(uint16_t baseAddress,
                                    uint8_t clockSelect,
                                    uint8_t clockDivider);

//*****************************************************************************
//
//! \brief Sets the clock source for the Watchdog Timer in timer interval mode.
//!
//! This function sets the watchdog timer as timer interval mode, which will
//! assert an interrupt without causing a PUC.
//!
//! \param baseAddress is the base address of the WDT_A module.
//! \param clockSelect is the clock source that the watchdog timer will use.
//!        Valid values are:
//!        - \b WDT_A_CLOCKSOURCE_SMCLK [Default]
//!        - \b WDT_A_CLOCKSOURCE_ACLK
//!        - \b WDT_A_CLOCKSOURCE_VLOCLK
//!        - \b WDT_A_CLOCKSOURCE_XCLK
//!        \n Modified bits are \b WDTSSEL of \b WDTCTL register.
//! \param clockDivider is the divider of the clock source, in turn setting the
//!        watchdog timer interval.
//!        Valid values are:
//!        - \b WDT_A_CLOCKDIVIDER_2G
//!        - \b WDT_A_CLOCKDIVIDER_128M
//!        - \b WDT_A_CLOCKDIVIDER_8192K
//!        - \b WDT_A_CLOCKDIVIDER_512K
//!        - \b WDT_A_CLOCKDIVIDER_32K [Default]
//!        - \b WDT_A_CLOCKDIVIDER_8192
//!        - \b WDT_A_CLOCKDIVIDER_512
//!        - \b WDT_A_CLOCKDIVIDER_64
//!        \n Modified bits are \b WDTIS and \b WDTHOLD of \b WDTCTL register.
//!
//! \return None
//
//*****************************************************************************
extern void WDT_A_initIntervalTimer(uint16_t baseAddress,
                                    uint8_t clockSelect,
                                    uint8_t clockDivider);

//*****************************************************************************
//
// Mark the end of the C bindings section for C++ compilers.
//
//*****************************************************************************
#ifdef __cplusplus
}
#endif

#endif
#endif // __MSP430WARE_WDT_A_H__