usb-firewall-firmware/RISC-V/Firmware/GD32VF103_standard_peripheral/Source/gd32vf103_bkp.c

/*!
    \file    gd32vf103_bkp.c
    \brief   BKP driver

    \version 2019-06-05, V1.0.0, firmware for GD32VF103
*/

/*
    Copyright (c) 2019, GigaDevice Semiconductor Inc.

    Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice, this 
       list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright notice, 
       this list of conditions and the following disclaimer in the documentation 
       and/or other materials provided with the distribution.
    3. Neither the name of the copyright holder nor the names of its contributors 
       may be used to endorse or promote products derived from this software without 
       specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.
*/

#include "gd32vf103_bkp.h"

/* BKP register bits offset */
#define BKP_TAMPER_BITS_OFFSET          ((uint32_t)8U)

/*!
    \brief      reset BKP registers
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_deinit(void)
{
    /* reset BKP domain register*/
    rcu_bkp_reset_enable();
    rcu_bkp_reset_disable();
}

/*!
    \brief      write BKP data register
    \param[in]  register_number: refer to bkp_data_register_enum
                only one parameter can be selected which is shown as below:
      \arg        BKP_DATA_x(x = 0..41): bkp data register number x
    \param[in]  data: the data to be write in BKP data register
    \param[out] none
    \retval     none
*/
void bkp_data_write(bkp_data_register_enum register_number, uint16_t data)
{
    if((register_number >= BKP_DATA_10) && (register_number <= BKP_DATA_41)){
        BKP_DATA10_41(register_number - 1U) = data;
    }else if((register_number >= BKP_DATA_0) && (register_number <= BKP_DATA_9)){
        BKP_DATA0_9(register_number - 1U) = data;
    }else{
        /* illegal parameters */
    }
}

/*!
    \brief      read BKP data register
    \param[in]  register_number: refer to bkp_data_register_enum
                only one parameter can be selected which is shown as below:
      \arg        BKP_DATA_x(x = 0..41): bkp data register number x
    \param[out] none
    \retval     data of BKP data register
*/
uint16_t bkp_data_read(bkp_data_register_enum register_number)
{
    uint16_t data = 0U;
    
    /* get the data from the BKP data register */
    if((register_number >= BKP_DATA_10) && (register_number <= BKP_DATA_41)){
        data = BKP_DATA10_41(register_number - 1U);
    }else if((register_number >= BKP_DATA_0) && (register_number <= BKP_DATA_9)){
        data = BKP_DATA0_9(register_number - 1U);
    }else{
        /* illegal parameters */
    }
    return data;
}

/*!
    \brief      enable RTC clock calibration output
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_rtc_calibration_output_enable(void)
{
    BKP_OCTL |= (uint16_t)BKP_OCTL_COEN;
}

/*!
    \brief      disable RTC clock calibration output
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_rtc_calibration_output_disable(void)
{
    BKP_OCTL &= (uint16_t)~BKP_OCTL_COEN;
}

/*!
    \brief      enable RTC alarm or second signal output
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_rtc_signal_output_enable(void)
{
    BKP_OCTL |= (uint16_t)BKP_OCTL_ASOEN;
}

/*!
    \brief      disable RTC alarm or second signal output
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_rtc_signal_output_disable(void)
{
    BKP_OCTL &= (uint16_t)~BKP_OCTL_ASOEN;
}

/*!
    \brief      select RTC output
    \param[in]  outputsel: RTC output selection
                only one parameter can be selected which is shown as below:
      \arg        RTC_OUTPUT_ALARM_PULSE: RTC alarm pulse is selected as the RTC output
      \arg        RTC_OUTPUT_SECOND_PULSE: RTC second pulse is selected as the RTC output
    \param[out] none
    \retval     none
*/
void bkp_rtc_output_select(uint16_t outputsel)
{
    uint16_t ctl = 0U;
    
    /* configure BKP_OCTL_ROSEL with outputsel */
    ctl = BKP_OCTL;
    ctl &= (uint16_t)~BKP_OCTL_ROSEL;
    ctl |= outputsel;
    BKP_OCTL = ctl;
}

/*!
    \brief      set RTC clock calibration value 
    \param[in]  value: RTC clock calibration value
      \arg        0x00 - 0x7F
    \param[out] none
    \retval     none
*/
void bkp_rtc_calibration_value_set(uint8_t value)
{
    uint16_t ctl;
    
    /* configure BKP_OCTL_RCCV with value */
    ctl = BKP_OCTL;
    ctl &= (uint16_t)~BKP_OCTL_RCCV;
    ctl |= (uint16_t)OCTL_RCCV(value);
    BKP_OCTL = ctl;
}

/*!
    \brief      enable tamper detection
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_tamper_detection_enable(void)
{
    BKP_TPCTL |= (uint16_t)BKP_TPCTL_TPEN;
}

/*!
    \brief      disable tamper detection
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_tamper_detection_disable(void)
{
    BKP_TPCTL &= (uint16_t)~BKP_TPCTL_TPEN;
}

/*!
    \brief      set tamper pin active level
    \param[in]  level: tamper active level
                only one parameter can be selected which is shown as below:
      \arg        TAMPER_PIN_ACTIVE_HIGH: the tamper pin is active high
      \arg        TAMPER_PIN_ACTIVE_LOW: the tamper pin is active low
    \param[out] none
    \retval     none
*/
void bkp_tamper_active_level_set(uint16_t level)
{
    uint16_t ctl = 0U;
    
    /* configure BKP_TPCTL_TPAL with level */
    ctl = BKP_TPCTL;
    ctl &= (uint16_t)~BKP_TPCTL_TPAL;
    ctl |= level;
    BKP_TPCTL = ctl;
}

/*!
    \brief      enable tamper interrupt
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_interrupt_enable(void)
{
    BKP_TPCS |= (uint16_t)BKP_TPCS_TPIE;
}

/*!
    \brief      disable tamper interrupt
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_interrupt_disable(void)
{
    BKP_TPCS &= (uint16_t)~BKP_TPCS_TPIE;
}

/*!
    \brief      get tamper flag state
    \param[in]  none
    \param[out] none
    \retval     FlagStatus: SET or RESET
*/
FlagStatus bkp_flag_get(void)
{
    if(RESET != (BKP_TPCS & BKP_FLAG_TAMPER)){
        return SET;
    }else{
        return RESET;
    }
}

/*!
    \brief      clear tamper flag state
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_flag_clear(void)
{
    BKP_TPCS |= (uint16_t)(BKP_FLAG_TAMPER >> BKP_TAMPER_BITS_OFFSET);
}

/*!
    \brief      get tamper interrupt flag state
    \param[in]  none
    \param[out] none
    \retval     FlagStatus: SET or RESET
*/
FlagStatus bkp_interrupt_flag_get(void)
{
    if(RESET != (BKP_TPCS & BKP_INT_FLAG_TAMPER)){
        return SET;
    }else{
        return RESET;
    }
}

/*!
    \brief      clear tamper interrupt flag state
    \param[in]  none
    \param[out] none
    \retval     none
*/
void bkp_interrupt_flag_clear(void)
{
    BKP_TPCS |= (uint16_t)(BKP_INT_FLAG_TAMPER >> BKP_TAMPER_BITS_OFFSET);
}