153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : ch32v30x_rng.c
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* Author : WCH
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* Version : V1.0.0
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* Date : 2021/06/06
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* Description : This file provides all the RNG firmware functions.
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* SPDX-License-Identifier: Apache-2.0
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********************************************************************************/
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#include "ch32v30x_rng.h"
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#include "ch32v30x_rcc.h"
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/*********************************************************************
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* @fn RNG_Cmd
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*
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* @brief Enables or disables the RNG peripheral.
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*
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* @param NewState - ENABLE or DISABLE.
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*
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* @return none
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*/
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void RNG_Cmd(FunctionalState NewState)
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{
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if(NewState != DISABLE)
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{
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RNG->CR |= RNG_CR_RNGEN;
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}
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else
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{
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RNG->CR &= ~RNG_CR_RNGEN;
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}
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}
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/*********************************************************************
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* @fn RNG_GetRandomNumber
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*
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* @brief Returns a 32-bit random number.
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*
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* @return 32-bit random number.
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*/
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uint32_t RNG_GetRandomNumber(void)
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{
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return RNG->DR;
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}
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/*********************************************************************
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* @fn RNG_ITConfig
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*
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* @brief Enables or disables the RNG interrupt.
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*
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* @param NewState - ENABLE or DISABLE.
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*
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* @return 32-bit random number.
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*/
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void RNG_ITConfig(FunctionalState NewState)
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{
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if(NewState != DISABLE)
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{
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RNG->CR |= RNG_CR_IE;
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}
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else
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{
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RNG->CR &= ~RNG_CR_IE;
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}
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}
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/*********************************************************************
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* @fn RNG_GetFlagStatus
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*
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* @brief Checks whether the specified RNG flag is set or not.
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*
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* @param RNG_FLAG - specifies the RNG flag to check.
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* RNG_FLAG_DRDY - Data Ready flag.
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* RNG_FLAG_CECS - Clock Error Current flag.
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* RNG_FLAG_SECS - Seed Error Current flag.
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*
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* @return 32-bit random number.
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*/
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FlagStatus RNG_GetFlagStatus(uint8_t RNG_FLAG)
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{
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FlagStatus bitstatus = RESET;
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if((RNG->SR & RNG_FLAG) != (uint8_t)RESET)
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{
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bitstatus = SET;
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}
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else
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{
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bitstatus = RESET;
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}
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return bitstatus;
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}
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/*********************************************************************
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* @fn RNG_ClearFlag
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*
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* @brief Clears the RNG flags.
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*
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* @param RNG_FLAG - specifies the flag to clear.
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* RNG_FLAG_CECS - Clock Error Current flag.
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* RNG_FLAG_SECS - Seed Error Current flag.
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*
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* @return 32-bit random number.
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*/
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void RNG_ClearFlag(uint8_t RNG_FLAG)
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{
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RNG->SR = ~(uint32_t)(((uint32_t)RNG_FLAG) << 4);
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}
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/*********************************************************************
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* @fn RNG_GetFlagStatus
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*
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* @brief Checks whether the specified RNG interrupt has occurred or not.
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*
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* @param RNG_IT - specifies the RNG interrupt source to check.
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* RNG_IT_CEI - Clock Error Interrupt.
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* RNG_IT_SEI - Seed Error Interrupt.
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*
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* @return bitstatus<75><73>SET or RESET.
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*/
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ITStatus RNG_GetITStatus(uint8_t RNG_IT)
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{
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ITStatus bitstatus = RESET;
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if((RNG->SR & RNG_IT) != (uint8_t)RESET)
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{
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bitstatus = SET;
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}
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else
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{
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bitstatus = RESET;
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}
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return bitstatus;
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}
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/*********************************************************************
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* @fn RNG_ClearITPendingBit
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*
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* @brief Clears the RNG interrupt pending bit(s).
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*
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* @param RNG_IT - specifies the RNG interrupt pending bit(s) to clear.
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* RNG_IT_CEI - Clock Error Interrupt.
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* RNG_IT_SEI - Seed Error Interrupt.
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*
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* @return None
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*/
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void RNG_ClearITPendingBit(uint8_t RNG_IT)
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{
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RNG->SR = (uint8_t)~RNG_IT;
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}
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