CIU32_L051_M307R/Peripheral/CIU32L051_Lib/Source/ciu32l051_std_crc.c

/************************************************************************************************/
/**
* @file               ciu32l051_std_crc.c
* @author             MCU Ecosystem Development Team
* @brief              CRC STD<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*                     ʵ<EFBFBD><EFBFBD>CRC<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>õȹ<EFBFBD><EFBFBD><EFBFBD>API<EFBFBD><EFBFBD>
*                           
*
**************************************************************************************************
* @attention
* Copyright (c) CEC Huada Electronic Design Co.,Ltd. All rights reserved.
*
**************************************************************************************************
*/

/************************************************************************************************/
/**
* @addtogroup CIU32L051_STD_Driver
* @{
*/

/**
* @addtogroup CRC
* @{
*
*/
/************************************************************************************************/


/*------------------------------------------includes--------------------------------------------*/
#include "ciu32l051_std.h"

#ifdef STD_CRC_PERIPHERAL_USED

/*-------------------------------------------functions------------------------------------------*/

/************************************************************************************************/
/**
* @addtogroup CRC_External_Functions 
* @{
*
*/
/************************************************************************************************/
/**
* @brief  CRC<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>
* @param  crc_init_param CRC<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ     
* @retval <EFBFBD><EFBFBD>
*/
void std_crc_init(std_crc_init_t *crc_init_param)
{
    /* <20><><EFBFBD>ö<EFBFBD><C3B6><EFBFBD>ʽ */
    MODIFY_REG(CRC->CSR, CRC_CSR_POLY_SIZE, (crc_init_param->poly_sel));
    
    /* <20><><EFBFBD>ó<EFBFBD>ʼֵ */
    if (crc_init_param->set_iv_flag == CRC_USE_INIT_VALUE)
    {
        std_crc_set_init_value(crc_init_param->init_value);        
    }
    else
    {
        std_crc_set_init_value_invert(crc_init_param->poly_sel, crc_init_param->init_value);
    }                  
}

/**
* @brief  CRCȥ<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>
* @retval <EFBFBD><EFBFBD>
*/
void std_crc_deinit(void)
{
    /* <20><>λCRC */
    std_rcc_ahb_reset(RCC_PERIPH_RESET_CRC); 
    
    /* <20>ر<EFBFBD>CRCʱ<43><CAB1> */
    std_rcc_ahb_clk_disable(RCC_PERIPH_CLK_CRC);
    
}

/**
* @brief  <EFBFBD><EFBFBD><EFBFBD><EFBFBD>CRC<EFBFBD>ṹ<EFBFBD><EFBFBD>ΪĬ<EFBFBD><EFBFBD>ֵ
* @param  crc_init_struct CRC<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ    
* @retval <EFBFBD><EFBFBD>
*/
void std_crc_struct_init(std_crc_init_t *crc_init_struct)
{
    crc_init_struct->poly_sel = CRC_POLY_32;
    crc_init_struct->init_value = CRC_DEFAULT_INIT_VALUE;
    crc_init_struct->set_iv_flag = CRC_USE_INIT_VALUE;       
}


/**
* @brief  <EFBFBD><EFBFBD>CRC<EFBFBD><EFBFBD>ʼֵ<EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD>
* @param  poly_sel   <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽѡ<EFBFBD><EFBFBD>
* @param  init_value <EFBFBD>Զ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼֵ
* @retval <EFBFBD><EFBFBD>
*/
void std_crc_set_init_value_invert(uint32_t poly_sel, uint32_t init_value)
{
    uint32_t index, temp; 
    uint32_t result = 0;
    
    /* <20><>ʼֵ<CABC><D6B5>λ<EFBFBD><CEBB>ת */
    for (index = 0U; index < 4; index++)
    {
        temp = (init_value >> (8U * index));
        temp = (((temp & 0x55) << 1) | ((temp & 0xaa) >> 1));
        temp = (((temp & 0x33) << 2) | ((temp & 0xcc) >> 2));
        temp = (((temp & 0x0f) << 4) | ((temp & 0xf0) >> 4));
        result |= (temp << (8U * (3 - index)));
    }

    if (poly_sel == CRC_POLY_16) 
    {
        result >>= 16;
    }
    CRC->RDR = result;
}

/**
* @}
*/

#endif /* STD_CRC_PERIPHERAL_USED */

/** 
* @} 
*/

/** 
* @} 
*/