/*!
    \file  gd32f4xx_wwdgt.h
    \brief definitions for the WWDGT 
*/

/*
    Copyright (C) 2016 GigaDevice

    2016-08-15, V1.0.0, firmware for GD32F4xx
*/

#ifndef GD32F4XX_WWDGT_H
#define GD32F4XX_WWDGT_H

#include "gd32f4xx.h"

/* WWDGT definitions */
#define WWDGT                       WWDGT_BASE

/* registers definitions */
#define WWDGT_CTL                   REG32((WWDGT) + 0x00U)          /*!< WWDGT control register */
#define WWDGT_CFG                   REG32((WWDGT) + 0x04U)          /*!< WWDGT configuration register */
#define WWDGT_STAT                  REG32((WWDGT) + 0x08U)          /*!< WWDGT status register */

/* bits definitions */
/* WWDGT_CTL */
#define WWDGT_CTL_CNT               BITS(0,6)                       /*!< WWDGT counter value */
#define WWDGT_CTL_WDGTEN            BIT(7)                          /*!< WWDGT counter enable */

/* WWDGT_CFG */
#define WWDGT_CFG_WIN               BITS(0,6)                       /*!< WWDGT counter window value */
#define WWDGT_CFG_PSC               BITS(7,8)                       /*!< WWDGT prescaler divider value */
#define WWDGT_CFG_EWIE              BIT(9)                          /*!< early wakeup interrupt enable */

/* WWDGT_STAT */
#define WWDGT_STAT_EWIF             BIT(0)                          /*!< early wakeup interrupt flag */

/* constants definitions */
#define CFG_PSC(regval)             (BITS(7,8) & ((uint32_t)(regval) << 7))   /*!< write value to WWDGT_CFG_PSC bit field */
#define WWDGT_CFG_PSC_DIV1          CFG_PSC(0)                      /*!< the time base of WWDGT = (PCLK1/4096)/1 */
#define WWDGT_CFG_PSC_DIV2          CFG_PSC(1)                      /*!< the time base of WWDGT = (PCLK1/4096)/2 */
#define WWDGT_CFG_PSC_DIV4          CFG_PSC(2)                      /*!< the time base of WWDGT = (PCLK1/4096)/4 */
#define WWDGT_CFG_PSC_DIV8          CFG_PSC(3)                      /*!< the time base of WWDGT = (PCLK1/4096)/8 */

/* function declarations */
/* reset the window watchdog timer configuration */
void wwdgt_deinit(void);
/* start the window watchdog timer counter */
void wwdgt_enable(void);

/* configure the window watchdog timer counter value */
void wwdgt_counter_update(uint16_t counter_value);
/* configure counter value, window value, and prescaler divider value */
void wwdgt_config(uint16_t counter, uint16_t window, uint32_t prescaler);

/* enable early wakeup interrupt of WWDGT */
void wwdgt_interrupt_enable(void);
/* check early wakeup interrupt state of WWDGT */
FlagStatus wwdgt_flag_get(void);
/* clear early wakeup interrupt state of WWDGT */
void wwdgt_flag_clear(void);

#endif /* GD32F4XX_WWDGT_H */