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/********************************** (C) COPYRIGHT *******************************
* File Name : ch32f20x_crc.c
* Author : WCH
* Version : V1.0.0
* Date : 2021/08/08
* Description : This file provides all the CRC firmware functions.
*******************************************************************************/
#include "ch32f20x_crc.h"
/*******************************************************************************
* Function Name : CRC_ResetDR
* Description : Resets the CRC Data register (DR).
* Input : None
* Return : None
*******************************************************************************/
void CRC_ResetDR(void)
{
CRC->CTLR = CRC_CTLR_RESET;
}
/*******************************************************************************
* Function Name : CRC_CalcCRC
* Description : Computes the 32-bit CRC of a given data word(32-bit).
* Input : Data: data word(32-bit) to compute its CRC.
* Return : 32-bit CRC.
*******************************************************************************/
uint32_t CRC_CalcCRC(uint32_t Data)
{
CRC->DATAR = Data;
return (CRC->DATAR);
}
/*******************************************************************************
* Function Name : CRC_CalcBlockCRC
* Description : Computes the 32-bit CRC of a given buffer of data word(32-bit).
* Input : pBuffer: pointer to the buffer containing the data to be computed.
* BufferLength: length of the buffer to be computed.
* Return : 32-bit CRC.
*******************************************************************************/
uint32_t CRC_CalcBlockCRC(uint32_t pBuffer[], uint32_t BufferLength)
{
uint32_t index = 0;
for(index = 0; index < BufferLength; index++)
{
CRC->DATAR = pBuffer[index];
}
return (CRC->DATAR);
}
/*******************************************************************************
* Function Name : CRC_GetCRC
* Description : Returns the current CRC value.
* Input : None
* Return : 32-bit CRC.
*******************************************************************************/
uint32_t CRC_GetCRC(void)
{
return (CRC->IDATAR);
}
/*******************************************************************************
* Function Name : CRC_SetIDRegister
* Description : Stores a 8-bit data in the Independent Data(ID) register.
* Input : IDValue: 8-bit value to be stored in the ID register.
* Return : None
*******************************************************************************/
void CRC_SetIDRegister(uint8_t IDValue)
{
CRC->IDATAR = IDValue;
}
/*******************************************************************************
* Function Name : CRC_GetIDRegister
* Description : Returns the 8-bit data stored in the Independent Data(ID) register.
* Input : None
* Return : 8-bit value of the ID register.
*******************************************************************************/
uint8_t CRC_GetIDRegister(void)
{
return (CRC->IDATAR);
}
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