rt-thread/bsp/mm32f103x/Libraries/MM32F103/HAL_lib/src/HAL_flash.c

/**
******************************************************************************
* @file    HAL_flash.c
* @author  AE Team
* @version V1.1.0
* @date    28/08/2019
* @brief   This file provides all the FLASH firmware functions.
******************************************************************************
* @copy
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, MindMotion SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>&copy; COPYRIGHT 2019 MindMotion</center></h2>
*/

/* Includes ------------------------------------------------------------------*/
#include "HAL_flash.h"

/** @addtogroup StdPeriph_Driver
* @{
*/

/** @defgroup FLASH
* @brief FLASH driver modules
* @{
*/

/** @defgroup FLASH_Private_TypesDefinitions
* @{
*/

/**
* @}
*/

/** @defgroup FLASH_Private_Defines
* @{
*/

/* Flash Access Control Register bits */
#define ACR_LATENCY_Mask         ((uint32_t)0x00000038)
#define ACR_HLFCYA_Mask          ((uint32_t)0xFFFFFFF7)
#define ACR_PRFTBE_Mask          ((uint32_t)0xFFFFFFEF)

/* Flash Access Control Register bits */
#define ACR_PRFTBS_Mask          ((uint32_t)0x00000020)

/* Flash Control Register bits */
#define CR_PG_Set                ((uint32_t)0x00000001)
#define CR_PG_Reset              ((uint32_t)0x00001FFE)
#define CR_PER_Set               ((uint32_t)0x00000002)
#define CR_PER_Reset             ((uint32_t)0x00001FFD)
#define CR_MER_Set               ((uint32_t)0x00000004)
#define CR_MER_Reset             ((uint32_t)0x00001FFB)
#define CR_OPTPG_Set             ((uint32_t)0x00000010)
#define CR_OPTPG_Reset           ((uint32_t)0x00001FEF)
#define CR_OPTER_Set             ((uint32_t)0x00000020)
#define CR_OPTER_Reset           ((uint32_t)0x00001FDF)
#define CR_STRT_Set              ((uint32_t)0x00000040)
#define CR_LOCK_Set              ((uint32_t)0x00000080)

/* FLASH Mask */
#define RDPRT_Mask               ((uint32_t)0x00000002)
#define WRP0_Mask                ((uint32_t)0x000000FF)
#define WRP1_Mask                ((uint32_t)0x0000FF00)
#define WRP2_Mask                ((uint32_t)0x00FF0000)
#define WRP3_Mask                ((uint32_t)0xFF000000)

/* FLASH Keys */
#define RDP_Key                  ((uint16_t)0x00A5)
#define FLASH_KEY1               ((uint32_t)0x45670123)
#define FLASH_KEY2               ((uint32_t)0xCDEF89AB)

/* Delay definition */
#define EraseTimeout             ((uint32_t)0x00000FFF)
#define ProgramTimeout           ((uint32_t)0x0000000F)

/**
* @}
*/

/** @defgroup FLASH_Private_Macros
* @{
*/

/**
* @}
*/

/** @defgroup FLASH_Private_Variables
* @{
*/

/**
* @}
*/

/** @defgroup FLASH_Private_FunctionPrototypes
* @{
*/

static void delay(void);
/**
* @}
*/

/** @defgroup FLASH_Private_Functions
* @{
*/

/**
* @brief  Sets the code latency value.
* @param FLASH_Latency: specifies the FLASH Latency value.
*   This parameter can be one of the following values:
* @arg FLASH_Latency_0: FLASH Zero Latency cycle
* @arg FLASH_Latency_1: FLASH One Latency cycle
* @arg FLASH_Latency_2: FLASH Two Latency cycles
* @arg FLASH_Latency_3: FLASH Three Latency cycles
* @retval : None
*/
void FLASH_SetLatency(uint32_t FLASH_Latency)
{
    uint32_t tmpreg = 0;

    /* Check the parameters */
    assert_param(IS_FLASH_LATENCY(FLASH_Latency));

    /* Read the ACR register */
    tmpreg = FLASH->ACR;

    /* Sets the Latency value */
    tmpreg &= ACR_LATENCY_Mask;
    tmpreg |= FLASH_Latency;

    /* Write the ACR register */
    FLASH->ACR = tmpreg;
}

/**
* @brief  Enables or disables the Half cycle flash access.
* @param FLASH_HalfCycleAccess: specifies the FLASH Half cycle Access mode.
*   This parameter can be one of the following values:
* @arg FLASH_HalfCycleAccess_Enable: FLASH Half Cycle Enable
* @arg FLASH_HalfCycleAccess_Disable: FLASH Half Cycle Disable
* @retval : None
*/
void FLASH_HalfCycleAccessCmd(uint32_t FLASH_HalfCycleAccess)
{
    /* Check the parameters */
    assert_param(IS_FLASH_HALFCYCLEACCESS_STATE(FLASH_HalfCycleAccess));

    /* Enable or disable the Half cycle access */
    FLASH->ACR &= ACR_HLFCYA_Mask;
    FLASH->ACR |= FLASH_HalfCycleAccess;
}

/**
* @brief  Enables or disables the Prefetch Buffer.
* @param FLASH_PrefetchBuffer: specifies the Prefetch buffer status.
*   This parameter can be one of the following values:
* @arg FLASH_PrefetchBuffer_Enable: FLASH Prefetch Buffer Enable
* @arg FLASH_PrefetchBuffer_Disable: FLASH Prefetch Buffer Disable
* @retval : None
*/
void FLASH_PrefetchBufferCmd(uint32_t FLASH_PrefetchBuffer)
{
    /* Check the parameters */
    assert_param(IS_FLASH_PREFETCHBUFFER_STATE(FLASH_PrefetchBuffer));

    /* Enable or disable the Prefetch Buffer */
    FLASH->ACR &= ACR_PRFTBE_Mask;
    FLASH->ACR |= FLASH_PrefetchBuffer;
}

/**
* @brief  Unlocks the FLASH Program Erase Controller.
* @param  None
* @retval : None
*/
void FLASH_Unlock(void)
{
    /* Authorize the FPEC Access */
    FLASH->KEYR = FLASH_KEY1;
    FLASH->KEYR = FLASH_KEY2;
}

/**
* @brief  Locks the FLASH Program Erase Controller.
* @param  None
* @retval : None
*/
void FLASH_Lock(void)
{
    /* Set the Lock Bit to lock the FPEC and the FCR */
    FLASH->CR |= CR_LOCK_Set;
}

/**
* @brief  Erases a specified FLASH page.
* @param Page_Address: The page address to be erased.
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
*   FLASH_TIMEOUT.
*/
FLASH_Status FLASH_ErasePage(uint32_t Page_Address)
{
    FLASH_Status status = FLASH_COMPLETE;
    /* Check the parameters */
    assert_param(IS_FLASH_ADDRESS(Page_Address));

    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(EraseTimeout);

    if(status == FLASH_COMPLETE)
    {
        /* if the previous operation is completed, proceed to erase the page */
        FLASH->CR |= CR_PER_Set;
        FLASH->AR = Page_Address;
        FLASH->CR |= CR_STRT_Set;

        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(EraseTimeout);
        if(status != FLASH_BUSY)
        {
            /* if the erase operation is completed, disable the PER Bit */
            FLASH->CR &= CR_PER_Reset;
        }
    }

    /* Return the Erase Status */
    return status;
}

/**
* @brief  Erases all FLASH pages.
* @param  None
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
*   FLASH_TIMEOUT.
*/
FLASH_Status FLASH_EraseAllPages(void)
{
    FLASH_Status status = FLASH_COMPLETE;

    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(EraseTimeout);

    if(status == FLASH_COMPLETE)
    {
        /* if the previous operation is completed, proceed to erase all pages */
        FLASH->AR = 0x08000000;
        FLASH->CR |= CR_MER_Set;
        FLASH->CR |= CR_STRT_Set;

        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(EraseTimeout);
        if(status != FLASH_BUSY)
        {
            /* if the erase operation is completed, disable the MER Bit */
            FLASH->CR &= CR_MER_Reset;
        }
    }

    /* Return the Erase Status */
    return status;
}

/**
* @brief  Erases the FLASH option bytes.
* @param  None
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
*   FLASH_TIMEOUT.
*/
FLASH_Status FLASH_EraseOptionBytes(void)
{
    FLASH_Status status = FLASH_COMPLETE;

    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(EraseTimeout);
    if(status == FLASH_COMPLETE)
    {
        /* Authorize the small information block programming */
        FLASH->OPTKEYR = FLASH_KEY1;
        FLASH->OPTKEYR = FLASH_KEY2;

        /* if the previous operation is completed, proceed to erase the option bytes */
        FLASH->CR |= CR_OPTER_Set;
        FLASH->AR = 0x1FFFF800;
        FLASH->CR |= CR_STRT_Set;
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(EraseTimeout);

        if(status == FLASH_COMPLETE)
        {
            /* if the erase operation is completed, disable the OPTER Bit */
            FLASH->CR &= CR_OPTER_Reset;

            /* Enable the Option Bytes Programming operation */
            FLASH->CR |= CR_OPTPG_Set;

            /* Enable the readout access */
            OB->RDP = RDP_Key;

            /* Wait for last operation to be completed */
            status = FLASH_WaitForLastOperation(ProgramTimeout);

            if(status != FLASH_BUSY)
            {
                /* if the program operation is completed, disable the OPTPG Bit */
                FLASH->CR &= CR_OPTPG_Reset;
            }
        }
        else
        {
            if (status != FLASH_BUSY)
            {
                /* Disable the OPTPG Bit */
                FLASH->CR &= CR_OPTPG_Reset;
            }
        }
    }
    /* Return the erase status */
    return status;
}

/**
* @brief  Programs a word at a specified address.
* @param Address: specifies the address to be programmed.
* @param Data: specifies the data to be programmed.
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
*   FLASH_TIMEOUT.
*/
FLASH_Status FLASH_ProgramWord(uint32_t Address, uint32_t Data)
{
    FLASH_Status status = FLASH_COMPLETE;
    /* Check the parameters */
    assert_param(IS_FLASH_ADDRESS(Address));




    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(ProgramTimeout);

    if(status == FLASH_COMPLETE)
    {
        /* if the previous operation is completed, proceed to program the new first
        half word */
        FLASH->CR |= CR_PG_Set;

        *(__IO uint16_t*)Address = (uint16_t)Data;
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(ProgramTimeout);

        if(status == FLASH_COMPLETE)
        {
            /* if the previous operation is completed, proceed to program the new second
            half word */
            *(__IO uint16_t*)(Address + 2) = Data >> 16;

            /* Wait for last operation to be completed */
            status = FLASH_WaitForLastOperation(ProgramTimeout);

            if(status != FLASH_BUSY)
            {
                /* Disable the PG Bit */
                FLASH->CR &= CR_PG_Reset;
            }
        }
        else
        {
            if (status != FLASH_BUSY)
            {
                /* Disable the PG Bit */
                FLASH->CR &= CR_PG_Reset;
            }
        }
    }


    /* Return the Program Status */
    return status;
}

/**
* @brief  Programs a half word at a specified address.
* @param Address: specifies the address to be programmed.
* @param Data: specifies the data to be programmed.
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
*   FLASH_TIMEOUT.
*/
FLASH_Status FLASH_ProgramHalfWord(uint32_t Address, uint16_t Data)
{
    FLASH_Status status = FLASH_COMPLETE;
    /* Check the parameters */
    assert_param(IS_FLASH_ADDRESS(Address));



    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(ProgramTimeout);

    if(status == FLASH_COMPLETE)
    {
        /* if the previous operation is completed, proceed to program the new data */
        FLASH->CR |= CR_PG_Set;

        *(__IO uint16_t*)Address = Data;
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(ProgramTimeout);
        if(status != FLASH_BUSY)
        {
            /* if the program operation is completed, disable the PG Bit */
            FLASH->CR &= CR_PG_Reset;
        }
    }


    /* Return the Program Status */
    return status;
}

/**
* @brief  Programs a half word at a specified Option Byte Data address.
* @param Address: specifies the address to be programmed.
*   This parameter can be 0x1FFFF804 or 0x1FFFF806.
* @param Data: specifies the data to be programmed.
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
*   FLASH_TIMEOUT.
*/
FLASH_Status FLASH_ProgramOptionByteData(uint32_t Address, uint8_t Data)
{
    FLASH_Status status = FLASH_COMPLETE;
    /* Check the parameters */
    assert_param(IS_OB_DATA_ADDRESS(Address));



    status = FLASH_WaitForLastOperation(ProgramTimeout);
    if(status == FLASH_COMPLETE)
    {
        /* Authorize the small information block programming */
        FLASH->OPTKEYR = FLASH_KEY1;
        FLASH->OPTKEYR = FLASH_KEY2;
        /* Enables the Option Bytes Programming operation */
        FLASH->CR |= CR_OPTPG_Set;
        *(__IO uint16_t*)Address = Data;

        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(ProgramTimeout);
        if(status != FLASH_BUSY)
        {
            /* if the program operation is completed, disable the OPTPG Bit */
            FLASH->CR &= CR_OPTPG_Reset;
        }
    }



    /* Return the Option Byte Data Program Status */
    return status;
}

/**
* @brief  Write protects the desired pages
* @param FLASH_Pages: specifies the address of the pages to be
*   write protected. This parameter can be:
* @arg For microcontroller Medium-density devices (FLASH page size equal to 1 KB)
* A value between FLASH_WRProt_Pages0to3 and FLASH_WRProt_Pages124to127
* @arg For microcontroller High-density devices (FLASH page size equal to 2 KB)
* A value between FLASH_WRProt_Pages0to1 and  FLASH_WRProt_Pages60to61
* or FLASH_WRProt_Pages62to255
* @arg FLASH_WRProt_AllPages
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
*   FLASH_TIMEOUT.
*/
FLASH_Status FLASH_EnableWriteProtection(uint32_t FLASH_Pages)
{
    uint16_t WRP0_Data = 0xFFFF, WRP1_Data = 0xFFFF, WRP2_Data = 0xFFFF, WRP3_Data = 0xFFFF;

    FLASH_Status status = FLASH_COMPLETE;

    /* Check the parameters */
    assert_param(IS_FLASH_WRPROT_PAGE(FLASH_Pages));



    FLASH_Pages = (uint32_t)(~FLASH_Pages);
    WRP0_Data = (uint16_t)(FLASH_Pages & WRP0_Mask);
    WRP1_Data = (uint16_t)((FLASH_Pages & WRP1_Mask) >> 8);
    WRP2_Data = (uint16_t)((FLASH_Pages & WRP2_Mask) >> 16);
    WRP3_Data = (uint16_t)((FLASH_Pages & WRP3_Mask) >> 24);

    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(ProgramTimeout);

    if(status == FLASH_COMPLETE)
    {
        /* Authorizes the small information block programming */
        FLASH->OPTKEYR = FLASH_KEY1;
        FLASH->OPTKEYR = FLASH_KEY2;
        FLASH->CR |= CR_OPTPG_Set;
        if(WRP0_Data != 0xFF)
        {
            OB->WRP0 = WRP0_Data;

            /* Wait for last operation to be completed */
            status = FLASH_WaitForLastOperation(ProgramTimeout);
        }
        if((status == FLASH_COMPLETE) && (WRP1_Data != 0xFF))
        {
            OB->WRP1 = WRP1_Data;

            /* Wait for last operation to be completed */
            status = FLASH_WaitForLastOperation(ProgramTimeout);
        }
        if((status == FLASH_COMPLETE) && (WRP2_Data != 0xFF))
        {
            OB->WRP2 = WRP2_Data;

            /* Wait for last operation to be completed */
            status = FLASH_WaitForLastOperation(ProgramTimeout);
        }

        if((status == FLASH_COMPLETE) && (WRP3_Data != 0xFF))
        {
            OB->WRP3 = WRP3_Data;

            /* Wait for last operation to be completed */
            status = FLASH_WaitForLastOperation(ProgramTimeout);
        }

        if(status != FLASH_BUSY)
        {
            /* if the program operation is completed, disable the OPTPG Bit */
            FLASH->CR &= CR_OPTPG_Reset;
        }
    }



    /* Return the write protection operation Status */
    return status;
}

/**
* @brief  Enables or disables the read out protection.
*   If the user has already programmed the other option bytes before
*   calling this function, he must re-program them since this
*   function erases all option bytes.
* @param Newstate: new state of the ReadOut Protection.
*   This parameter can be: ENABLE or DISABLE.
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
*   FLASH_TIMEOUT.
*/
FLASH_Status FLASH_ReadOutProtection(FunctionalState NewState)
{
    FLASH_Status status = FLASH_COMPLETE;
    /* Check the parameters */
    assert_param(IS_FUNCTIONAL_STATE(NewState));



    status = FLASH_WaitForLastOperation(EraseTimeout);
    if(status == FLASH_COMPLETE)
    {
        /* Authorizes the small information block programming */
        FLASH->OPTKEYR = FLASH_KEY1;
        FLASH->OPTKEYR = FLASH_KEY2;
        FLASH->AR = 0x1ffff800;
        FLASH->CR |= CR_OPTER_Set;
        FLASH->CR |= CR_STRT_Set;
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(EraseTimeout);
        if(status == FLASH_COMPLETE)
        {
            /* if the erase operation is completed, disable the OPTER Bit */
            FLASH->CR &= CR_OPTER_Reset;
            /* Enable the Option Bytes Programming operation */
            FLASH->CR |= CR_OPTPG_Set;
            if(NewState != DISABLE)
            {
                OB->RDP = 0x00;
            }
            else
            {
                OB->RDP = RDP_Key;
            }
            /* Wait for last operation to be completed */
            status = FLASH_WaitForLastOperation(EraseTimeout);

            if(status != FLASH_BUSY)
            {
                /* if the program operation is completed, disable the OPTPG Bit */
                FLASH->CR &= CR_OPTPG_Reset;
            }
        }
        else
        {
            if(status != FLASH_BUSY)
            {
                /* Disable the OPTER Bit */
                FLASH->CR &= CR_OPTER_Reset;
            }
        }
    }



    /* Return the protection operation Status */
    return status;
}

/**
* @brief  Programs the FLASH User Option Byte: IWDG_SW / RST_STOP /
*   RST_STDBY.
* @param OB_IWDG: Selects the IWDG mode
*   This parameter can be one of the following values:
* @arg OB_IWDG_SW: Software IWDG selected
* @arg OB_IWDG_HW: Hardware IWDG selected
* @param OB_STOP: Reset event when entering STOP mode.
*   This parameter can be one of the following values:
* @arg OB_STOP_NoRST: No reset generated when entering in STOP
* @arg OB_STOP_RST: Reset generated when entering in STOP
* @param OB_STDBY: Reset event when entering Standby mode.
*   This parameter can be one of the following values:
* @arg OB_STDBY_NoRST: No reset generated when entering in STANDBY
* @arg OB_STDBY_RST: Reset generated when entering in STANDBY
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
*   FLASH_TIMEOUT.
*/
FLASH_Status FLASH_UserOptionByteConfig(uint16_t OB_IWDG, uint16_t OB_STOP, uint16_t OB_STDBY)
{
    FLASH_Status status = FLASH_COMPLETE;
    /* Check the parameters */
    assert_param(IS_OB_IWDG_SOURCE(OB_IWDG));
    assert_param(IS_OB_STOP_SOURCE(OB_STOP));
    assert_param(IS_OB_STDBY_SOURCE(OB_STDBY));



    /* Authorize the small information block programming */
    FLASH->OPTKEYR = FLASH_KEY1;
    FLASH->OPTKEYR = FLASH_KEY2;

    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(ProgramTimeout);

    if(status == FLASH_COMPLETE)
    {
        /* Enable the Option Bytes Programming operation */
        FLASH->CR |= CR_OPTPG_Set;

        OB->USER = ( OB_IWDG | OB_STOP | OB_STDBY) | (uint16_t)0xF8;

        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(ProgramTimeout);
        if(status != FLASH_BUSY)
        {
            /* if the program operation is completed, disable the OPTPG Bit */
            FLASH->CR &= CR_OPTPG_Reset;
        }
    }



    /* Return the Option Byte program Status */
    return status;
}

/**
* @brief  Returns the FLASH User Option Bytes values.
* @param  None
* @retval : The FLASH User Option Bytes values:IWDG_SW(Bit0), RST_STOP(Bit1)
*   and RST_STDBY(Bit2).
*/
uint32_t FLASH_GetUserOptionByte(void)
{
    /* Return the User Option Byte */
    return (uint32_t)(FLASH->OBR >> 2);
}

/**
* @brief  Returns the FLASH Write Protection Option Bytes Register value.
* @param  None
* @retval : The FLASH Write Protection  Option Bytes Register value
*/
uint32_t FLASH_GetWriteProtectionOptionByte(void)
{
    /* Return the Falsh write protection Register value */
    return (uint32_t)(FLASH->WRPR);
}

/**
* @brief  Checks whether the FLASH Read Out Protection Status is set
*   or not.
* @param  None
* @retval : FLASH ReadOut Protection Status(SET or RESET)
*/
FlagStatus FLASH_GetReadOutProtectionStatus(void)
{
    FlagStatus readoutstatus = RESET;
    if ((FLASH->OBR & RDPRT_Mask) != (uint32_t)RESET)
    {
        readoutstatus = SET;
    }
    else
    {
        readoutstatus = RESET;
    }
    return readoutstatus;
}

/**
* @brief  Checks whether the FLASH Prefetch Buffer status is set or not.
* @param  None
* @retval : FLASH Prefetch Buffer Status (SET or RESET).
*/
FlagStatus FLASH_GetPrefetchBufferStatus(void)
{
    FlagStatus bitstatus = RESET;

    if ((FLASH->ACR & ACR_PRFTBS_Mask) != (uint32_t)RESET)
    {
        bitstatus = SET;
    }
    else
    {
        bitstatus = RESET;
    }
    /* Return the new state of FLASH Prefetch Buffer Status (SET or RESET) */
    return bitstatus;
}

/**
* @brief  Enables or disables the specified FLASH interrupts.
* @param FLASH_IT: specifies the FLASH interrupt sources to be
*   enabled or disabled.
*   This parameter can be any combination of the following values:
* @arg FLASH_IT_ERROR: FLASH Error Interrupt
* @arg FLASH_IT_EOP: FLASH end of operation Interrupt
* @param NewState: new state of the specified Flash interrupts.
*   This parameter can be: ENABLE or DISABLE.
* @retval : None
*/
void FLASH_ITConfig(uint16_t FLASH_IT, FunctionalState NewState)
{
    /* Check the parameters */
    assert_param(IS_FLASH_IT(FLASH_IT));
    assert_param(IS_FUNCTIONAL_STATE(NewState));
    if(NewState != DISABLE)
    {
        /* Enable the interrupt sources */
        FLASH->CR |= FLASH_IT;
    }
    else
    {
        /* Disable the interrupt sources */
        FLASH->CR &= ~(uint32_t)FLASH_IT;
    }
}

/**
* @brief  Checks whether the specified FLASH flag is set or not.
* @param FLASH_FLAG: specifies the FLASH flag to check.
*   This parameter can be one of the following values:
* @arg FLASH_FLAG_BSY: FLASH Busy flag
* @arg FLASH_FLAG_PGERR: FLASH Program error flag
* @arg FLASH_FLAG_WRPRTERR: FLASH Write protected error flag
* @arg FLASH_FLAG_EOP: FLASH End of Operation flag
* @arg FLASH_FLAG_OPTERR:  FLASH Option Byte error flag
* @retval : The new state of FLASH_FLAG (SET or RESET).
*/
FlagStatus FLASH_GetFlagStatus(uint16_t FLASH_FLAG)
{
    FlagStatus bitstatus = RESET;
    /* Check the parameters */
    assert_param(IS_FLASH_GET_FLAG(FLASH_FLAG)) ;
    if(FLASH_FLAG == FLASH_FLAG_OPTERR)
    {
        if((FLASH->OBR & FLASH_FLAG_OPTERR) != (uint32_t)RESET)
        {
            bitstatus = SET;
        }
        else
        {
            bitstatus = RESET;
        }
    }
    else
    {
        if((FLASH->SR & FLASH_FLAG) != (uint32_t)RESET)
        {
            bitstatus = SET;
        }
        else
        {
            bitstatus = RESET;
        }
    }
    /* Return the new state of FLASH_FLAG (SET or RESET) */
    return bitstatus;
}

/**
* @brief  Clears the FLASH’s pending flags.
* @param FLASH_FLAG: specifies the FLASH flags to clear.
*   This parameter can be any combination of the following values:
* @arg FLASH_FLAG_BSY: FLASH Busy flag
* @arg FLASH_FLAG_PGERR: FLASH Program error flag
* @arg FLASH_FLAG_WRPRTERR: FLASH Write protected error flag
* @arg FLASH_FLAG_EOP: FLASH End of Operation flag
* @retval : None
*/
void FLASH_ClearFlag(uint16_t FLASH_FLAG)
{
    /* Check the parameters */
    assert_param(IS_FLASH_CLEAR_FLAG(FLASH_FLAG)) ;

    /* Clear the flags */
    FLASH->SR = FLASH_FLAG;
}

/**
* @brief  Returns the FLASH Status.
* @param  None
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP or FLASH_COMPLETE
*/
FLASH_Status FLASH_GetStatus(void)
{
    FLASH_Status flashstatus = FLASH_COMPLETE;

    if((FLASH->SR & FLASH_FLAG_BSY) == FLASH_FLAG_BSY)
    {
        flashstatus = FLASH_BUSY;
    }
    else
    {
        if(FLASH->SR & FLASH_FLAG_PGERR)
        {
            flashstatus = FLASH_ERROR_PG;
        }
        else
        {
            if(FLASH->SR & FLASH_FLAG_WRPRTERR)
            {
                flashstatus = FLASH_ERROR_WRP;
            }
            else
            {
                flashstatus = FLASH_COMPLETE;
            }
        }
    }
    /* Return the Flash Status */
    return flashstatus;
}

/**
* @brief  Waits for a Flash operation to complete or a TIMEOUT to occur.
* @param Timeout: FLASH progamming Timeout
* @retval : FLASH Status: The returned value can be: FLASH_BUSY,
*   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
*   FLASH_TIMEOUT.
*/
FLASH_Status FLASH_WaitForLastOperation(uint32_t Timeout)
{
    FLASH_Status status = FLASH_COMPLETE;



    /* Check for the Flash Status */
    status = FLASH_GetStatus();
    /* Wait for a Flash operation to complete or a TIMEOUT to occur */
    while((status == FLASH_BUSY) && (Timeout != 0x00))
    {
        delay();
        status = FLASH_GetStatus();
        Timeout--;
    }
    if(Timeout == 0x00 )
    {
        status = FLASH_TIMEOUT;
    }



    /* Return the operation status */
    return status;
}

/**
* @brief  Inserts a time delay.
* @param  None
* @retval : None
*/
static void delay(void)
{
    __IO uint32_t i = 0;
    for(i = 0xFF; i != 0; i--)
    {
    }
}

/**
* @}
*/

/**
* @}
*/

/**
* @}
*/

/*-------------------------(C) COPYRIGHT 2019 MindMotion ----------------------*/