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/********************************** (C) COPYRIGHT *******************************
* File Name : ch32f20x_rng.c
* Author : WCH
* Version : V1.0.0
* Date : 2021/08/08
* Description : This file provides all the RNG firmware functions.
********************************************************************************/
#include "ch32f20x_rng.h"
#include "ch32f20x_rcc.h"
/*******************************************************************************
* Function Name : RNG_Cmd
* Description : Enables or disables the RNG peripheral.
* Input : NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void RNG_Cmd(FunctionalState NewState)
{
if (NewState != DISABLE)
{
RNG->CR |= RNG_CR_RNGEN;
}
else
{
RNG->CR &= ~RNG_CR_RNGEN;
}
}
/*******************************************************************************
* Function Name : RNG_GetRandomNumber
* Description : Returns a 32-bit random number.
* Input : None
* Return : 32-bit random number.
*******************************************************************************/
uint32_t RNG_GetRandomNumber(void)
{
return RNG->DR;
}
/*******************************************************************************
* Function Name : RNG_ITConfig
* Description : Enables or disables the RNG interrupt.
* Input : NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void RNG_ITConfig(FunctionalState NewState)
{
if (NewState != DISABLE)
{
RNG->CR |= RNG_CR_IE;
}
else
{
RNG->CR &= ~RNG_CR_IE;
}
}
/*******************************************************************************
* Function Name : RNG_GetFlagStatus
* Description : Checks whether the specified RNG flag is set or not.
* Input : RNG_FLAG: specifies the RNG flag to check.
* RNG_FLAG_DRDY: Data Ready flag.
* RNG_FLAG_CECS: Clock Error Current flag.
* RNG_FLAG_SECS: Seed Error Current flag.
* Return : bitstatus��SET or RESET.
*******************************************************************************/
FlagStatus RNG_GetFlagStatus(uint8_t RNG_FLAG)
{
FlagStatus bitstatus = RESET;
if ((RNG->SR & RNG_FLAG) != (uint8_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : RNG_ClearFlag
* Description : Clears the RNG flags.
* Input : RNG_FLAG: specifies the flag to clear.
* RNG_FLAG_CECS: Clock Error Current flag.
* RNG_FLAG_SECS: Seed Error Current flag.
* Return : None
*******************************************************************************/
void RNG_ClearFlag(uint8_t RNG_FLAG)
{
RNG->SR = ~(uint32_t)(((uint32_t)RNG_FLAG) << 4);
}
/*******************************************************************************
* Function Name : RNG_GetFlagStatus
* Description : Checks whether the specified RNG interrupt has occurred or not.
* Input : RNG_IT: specifies the RNG interrupt source to check.
* RNG_IT_CEI: Clock Error Interrupt.
* RNG_IT_SEI: Seed Error Interrupt.
* Return : bitstatus��SET or RESET.
*******************************************************************************/
ITStatus RNG_GetITStatus(uint8_t RNG_IT)
{
ITStatus bitstatus = RESET;
if ((RNG->SR & RNG_IT) != (uint8_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : RNG_ClearITPendingBit
* Description : Clears the RNG interrupt pending bit(s).
* Input : RNG_IT: specifies the RNG interrupt pending bit(s) to clear.
* RNG_IT_CEI: Clock Error Interrupt.
* RNG_IT_SEI: Seed Error Interrupt.
* Return : None
*******************************************************************************/
void RNG_ClearITPendingBit(uint8_t RNG_IT)
{
RNG->SR = (uint8_t)~RNG_IT;
}
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