rt-thread/bsp/apm32/libraries/APM32E10x_Library/APM32E10x_StdPeriphDriver/src/apm32e10x_pmu.c

/*!
 * @file       apm32e10x_pmu.c
 *
 * @brief      This file provides all the PMU firmware functions.
 *
 * @version     V1.0.2
 *
 * @date        2022-12-31
 *
 * @attention
 *
 *  Copyright (C) 2021-2023 Geehy Semiconductor
 *
 *  You may not use this file except in compliance with the
 *  GEEHY COPYRIGHT NOTICE (GEEHY SOFTWARE PACKAGE LICENSE).
 *
 *  The program is only for reference, which is distributed in the hope
 *  that it will be useful and instructional for customers to develop
 *  their software. Unless required by applicable law or agreed to in
 *  writing, the program is distributed on an "AS IS" BASIS, WITHOUT
 *  ANY WARRANTY OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the GEEHY SOFTWARE PACKAGE LICENSE for the governing permissions
 *  and limitations under the License.
 */

#include "apm32e10x_pmu.h"
#include "apm32e10x_rcm.h"

/** @addtogroup APM32E10x_StdPeriphDriver
  @{
*/

/** @addtogroup PMU_Driver
  * @brief PMU driver modules
  @{
*/

/** @defgroup  PMU_Functions Functions
  @{
*/

/*!
 * @brief     Reset the PMU peripheral register.
 *
 * @param     None
 *
 * @retval    None
 */
void PMU_Reset(void)
{
    RCM_EnableAPB1PeriphReset(RCM_APB1_PERIPH_PMU);
    RCM_DisableAPB1PeriphReset(RCM_APB1_PERIPH_PMU);
}

/*!
 * @brief     Enables access to the RTC and backup registers.
 *
 * @param     None
 *
 * @retval    None
 */
void PMU_EnableBackupAccess(void)
{
    PMU->CTRL_B.BPWEN = ENABLE ;
}

/*!
 * @brief     Disables access to the RTC and backup registers.
 *
 * @param     None
 *
 * @retval    None
 */
void PMU_DisableBackupAccess(void)
{
    PMU->CTRL_B.BPWEN = DISABLE;
}

/*!
 * @brief     Enables the Power Voltage Detector(PVD).
 *
 * @param     None
 *
 * @retval    None
 */
void PMU_EnablePVD(void)
{
    PMU->CTRL_B.PVDEN = ENABLE;
}

/*!
 * @brief     Disables the Power Voltage Detector(PVD).
 *
 * @param     None
 *
 * @retval    None
 */
void PMU_DisablePVD(void)
{
    PMU->CTRL_B.PVDEN = DISABLE;
}

/*!
 * @brief     Configure a voltage threshold detected by a power supply voltage detector (PVD).
 *
 * @param     level: specifies the PVD detection level
 *                   This parameter can be one of the following values:
 *                   @arg PMU_PVD_LEVEL_2V2 : Config PVD detection level to 2.2V
 *                   @arg PMU_PVD_LEVEL_2V3 : Config PVD detection level to 2.3V
 *                   @arg PMU_PVD_LEVEL_2V4 : Config PVD detection level to 2.4V
 *                   @arg PMU_PVD_LEVEL_2V5 : Config PVD detection level to 2.5V
 *                   @arg PMU_PVD_LEVEL_2V6 : Config PVD detection level to 2.6V
 *                   @arg PMU_PVD_LEVEL_2V7 : Config PVD detection level to 2.7V
 *                   @arg PMU_PVD_LEVEL_2V8 : Config PVD detection level to 2.8V
 *                   @arg PMU_PVD_LEVEL_2V9 : Config PVD detection level to 2.9V
 *
 * @retval    None
 */
void PMU_ConfigPVDLevel(PMU_PVD_LEVEL_T level)
{

    /* Clear PLS[7:5] bits */
    PMU->CTRL_B.PLSEL = 0x0000;
    /* Store the new value */
    PMU->CTRL_B.PLSEL = level;
}

/*!
 * @brief     Enables the WakeUp Pin functionality.
 *
 * @param     None
 *
 * @retval    None
 */
void PMU_EnableWakeUpPin(void)
{
    PMU->CSTS_B.WKUPCFG = ENABLE ;
}

/*!
 * @brief     Diaables the WakeUp Pin functionality.
 *
 * @param     None
 *
 * @retval    None
 */
void PMU_DisableWakeUpPin(void)
{
    PMU->CSTS_B.WKUPCFG = DISABLE ;
}

/*!
 * @brief     Enters STOP mode.
 *
 * @param     regulator: specifies the regulator state in STOP mode.
 *                       This parameter can be one of the following values:
 *                         @arg PMU_REGULATOR_ON      : STOP mode with regulator ON
 *                         @arg PMU_REGULATOR_LOWPOWER: STOP mode with regulator in low power mode
 *
 * @param     entry: specifies if STOP mode in entered with WFI or WFE instruction.
 *                   This parameter can be one of the following values:
 *                     @arg PMU_STOP_ENTRY_WFI: Enter STOP mode with WFI instruction
 *                     @arg PMU_STOP_ENTRY_WFE: Enter STOP mode with WFE instruction
 *
 * @retval    None
 */
void PMU_EnterSTOPMode(PMU_REGULATOR_T regulator, PMU_STOP_ENTRY_T entry)
{
    /** Clear PDDSCFG and LPDSCFG bits */
    PMU->CTRL_B.PDDSCFG = 0x00;
    PMU->CTRL_B.LPDSCFG = 0x00;
    /** Set LPDSCFG bit according to regulator value */
    PMU->CTRL_B.LPDSCFG = regulator;
    /** Set Cortex System Control Register */
    SCB->SCR |= (uint32_t )0x04;
    /** Select STOP mode entry*/
    if(entry == PMU_STOP_ENTRY_WFI)
    {
        /** Request Wait For Interrupt */
        __WFI();
    }
    else
    {
        /** Request Wait For Event */
        __WFE();
    }

    /** Reset SLEEPDEEP bit of Cortex System Control Register */
    SCB->SCR &= (uint32_t)~((uint32_t)0x04);

}

/*!
 * @brief     Enters STANDBY mode.
 *
 * @param     None
 *
 * @retval    None
 */
void PMU_EnterSTANDBYMode(void)
{
    /* Clear Wake-up flag */
    PMU->CTRL_B.WUFLGCLR = BIT_SET;
    /* Select STANDBY mode */
    PMU->CTRL_B.PDDSCFG = BIT_SET;
    /* Set Cortex System Control Register */
    SCB->SCR |= (uint32_t )0x04;
#if defined ( __CC_ARM   )
    __force_stores();
#endif
    /* Request Wait For Interrupt */
    __WFI();

}

/*!
 * @brief     Read the specified PWR flag is set or not.
 *
 * @param     flag: Reads the status of specifies the flag.
 *                  This parameter can be one of the following values:
 *                    @arg PMU_FLAG_WUE : Wake Up flag
 *                    @arg PMU_FLAG_SB  : StandBy flag
 *                    @arg PMU_FLAG_PVDO: PVD Output flag
 *
 * @retval    The new state of PMU_FLAG (SET or RESET).
 */
uint8_t PMU_ReadStatusFlag(PMU_FLAG_T flag)
{
    uint8_t BitStatus = BIT_RESET;

    if(flag == PMU_FLAG_WUE)
    {
        BitStatus = PMU->CSTS_B.WUEFLG;
    }
    else if(flag == PMU_FLAG_SB)
    {
        BitStatus = PMU->CSTS_B.SBFLG;
    }
    else if(flag == PMU_FLAG_PVDO)
    {
        BitStatus = PMU->CSTS_B.PVDOFLG;
    }
    return BitStatus;
}

/*!
 * @brief     Clears the PWR's pending flags.
 *
 * @param     flag: Clears the status of specifies the flag.
 *                  This parameter can be one of the following values:
 *                    @arg PMU_FLAG_WUE : Wake Up flag
 *                    @arg PMU_FLAG_SB  : StandBy flag
 *
 * @retval    None
 */
void PMU_ClearStatusFlag(PMU_FLAG_T flag)
{
    if(flag == PMU_FLAG_WUE)
    {
        PMU->CTRL_B.WUFLGCLR = BIT_SET;
    }
    else if(flag == PMU_FLAG_SB)
    {
        PMU->CTRL_B.SBFLGCLR = BIT_SET;
    }
}

/**@} end of group PMU_Functions */
/**@} end of group PMU_Driver */
/**@} end of group APM32E10x_StdPeriphDriver */