ma_wdt.c

NXP LPC系列AMR7的开发程序源码（LCD

/*
*****************************************************************************
**
**      Project     : My project
**
**      Component   : LPC2106 (LPC2106)
**
**      Modulename  : WDT
**
**      Filename    : ma_wdt.c
**
**      Abstract    : This file implements a device driver for the WDT 
**                    module.
**
**      Compiler    : IAR C compiler
**
**      Date        : 2004-05-26 17:21:26
**
**      License no. : 9503-663-863-6224     Ivan
**
**      Warning     : This file has been automatically generated.
**                    Do not edit this file if you intend to regenerate it.
**
**      This device driver was created by IAR MakeApp version 
**      4.02A (NXP LPC210x: 4.00C) for the NXP LPC210x series of
**      microcontrollers.
**
**      (c)Copyright 2004 IAR Systems.
**      Your rights to this file are explained in the IAR MakeApp 
**      License Agreement. All other rights reserved.
**
*****************************************************************************
*/

/*
**===========================================================================
**  1       GENERAL
**  1.1     Revisions
**
**  Please read the IAR MakeApp for NXP LPC210x readme file 
**  
**
**===========================================================================
*/

/*
**===========================================================================
**  1.2     References
** 
**  No   Identification          Name or Description
**  ==   ===================     ================================
**
**  1    02/Oct/2003             NXP LPC210x Hardware Manual
** 
**===========================================================================
*/

/*
**===========================================================================
**  2.      INCLUDE FILES
**  2.1     Standard include files
**===========================================================================
*/

/*
**===========================================================================
**  2.2     Application include files
**===========================================================================
*/

#include "usercode.h"   /* Usercode macros (see <template.h>) */
#include "ma_tgt.h"     /* Target specific header file */
#include "ma_sfr.h"     /* Special function register bitfield macros */
#include "iolpc210x.h"  /* Defines Special function registers */


#include "ma_wdt.h"     /* WDT Module driver header file */

/*
**===========================================================================
**  3.      DECLARATIONS
**  3.1     Internal constants
**===========================================================================
*/

#define MA_WDMOD_WDT           0x00000000  /* Watchdog Mode Register */
#define MA_WDMOD_WDT_MASK      0x0000000F  /* Used bits */
#define MA_WDTC_WDT            0x000000FF  /* Watchdog Timer Constant Register */
#define MA_WDTC_WDT_MASK       0xFFFFFFFF  /* Used bits */
#define MA_WDFEED_WDT          0x00000000  /* Watchdog Feed Sequence Register */
#define MA_WDFEED_WDT_MASK     0x000000FF  /* Used bits */
#define MA_WDTV_WDT            0x000000FF  /* Watchdog Timer Value Register */
#define MA_WDTV_WDT_MASK       0xFFFFFFFF  /* Used bits */

/*
**===========================================================================
**  3.2     Internal macros
**===========================================================================
*/


/*
**===========================================================================
**  3.3     Internal type definitions
**===========================================================================
*/

/*
**===========================================================================
**  3.4     Global variables (declared as 'extern' in some header file)
**===========================================================================
*/


/*
**===========================================================================
**  3.5     Internal function prototypes (defined in Section 5)
**===========================================================================
*/

/*
**===========================================================================
**  3.6     Internal variables
**===========================================================================
*/

/*
**===========================================================================
**  4.      GLOBAL FUNCTIONS (declared as 'extern' in some header file)
**===========================================================================
*/





void MA_Init_WDT( void ) 
/*
**---------------------------------------------------------------------------
**
**  Abstract:
**      Initialises the WDT module. Only sets those registers with values 
**      not equal to the power-on reset values. 
**
**  Parameters:
**      None
**
**  Returns:
**      None
**
**---------------------------------------------------------------------------
*/
{
    /*--- Handle user code on function entry ---*/
    ENTER_MA_INIT_WDT;
            
    /*--- Initialize registers ---*/

    /*--- Handle user code on function exit ---*/
    EXIT_MA_INIT_WDT;
    
} /* MA_Init_WDT */





void MA_Reset_WDT( void ) 
/*
**---------------------------------------------------------------------------
**
**  Abstract:
**      Resets the WDT module. Sets all registers. 
**
**  Parameters:
**      None
**
**  Returns:
**      None
**
**---------------------------------------------------------------------------
*/
{    
    /*--- Handle user code on function entry ---*/
    ENTER_MA_RESET_WDT;
    
    /*--- Reset registers ---*/
    WDTC     = MA_WDTC_WDT;
    WDMOD    = ( WDMOD & ~MA_WDMOD_WDT_MASK ) | MA_WDMOD_WDT;

    /*--- Handle user code on function exit ---*/
    EXIT_MA_RESET_WDT;
       
} /* MA_Reset_WDT */




void MA_Start_WDT( void ) 
/*
**---------------------------------------------------------------------------
**
**  Abstract:
**      Starts the watchdog if enabled in MakeApp. Once started it requires
**      a hardware reset or a Watchdog reset/interrupt to be disabled. 
**      
**
**  Parameters:
**      None
**
**  Returns:
**      None
**
**---------------------------------------------------------------------------
*/
{
    /*--- Handle user code on function entry ---*/
    ENTER_MA_START_WDT;

    /*--- This will start the watchdog ---*/
    WDFEED = 0xAA;
    WDFEED = 0x55;
    
    /*--- Handle user code on function exit ---*/
    EXIT_MA_START_WDT;

} /* MA_Start_WDT */





void MA_Trig_WDT( void ) 
/*
**---------------------------------------------------------------------------
**
**  Abstract:
**      Reloads the watchdog with the time-out value. The watchdog should be 
**      fed within the time period determined by the time-out value to prevent
**      reset.
**
**  Parameters:
**      None
**
**  Returns:
**      None
**
**---------------------------------------------------------------------------
*/
{
    /*--- Handle user code on function entry ---*/
    ENTER_MA_TRIG_WDT;

    /*--- Reload time-out value to prevent reset ---*/
    WDFEED = 0xAA;
    WDFEED = 0x55;

    /*--- Handle user code on function exit ---*/
    EXIT_MA_TRIG_WDT;

} /* MA_Trig_WDT */





U8 MA_Check_WDT( void ) 
/*
**---------------------------------------------------------------------------
**
**  Abstract:
**      Check the watchdog status. 
**
**  Parameters:
**      None
**
**  Returns:
**      TRUE  if watchdog has expired. (WDTOF is set)
**      FALSE if not. 
**
**---------------------------------------------------------------------------
*/
{
    U8 Status;
    
    /*--- Handle user code on function entry ---*/
    ENTER_MA_CHECK_WDT;

    /*--- Check the watchdog status bit ---*/
    if(         WDMOD_bit.WDTOF         )
    {
        Status = TRUE;
        WDMOD_bit.WDTOF = 1;        /* Clear flag */ 
    }
    else
    {
        Status = FALSE;
    }

    /*--- Handle user code on function exit ---*/
    EXIT_MA_CHECK_WDT;
    
    return  Status;

} /* MA_Check_WDT */




/*
**===========================================================================
**  5.      INTERNAL FUNCTIONS (declared in Section 3.5)
**===========================================================================
*/

/*
**===========================================================================
** END OF FILE
**===========================================================================
*/