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/*!
* @file apm32f4xx_rng.c
*
* @brief This file provides all the RNG firmware functions
*
* @version V1.0.2
*
* @date 2022-06-23
*
* @attention
*
* Copyright (C) 2021-2022 Geehy Semiconductor
*
* You may not use this file except in compliance with the
* GEEHY COPYRIGHT NOTICE (GEEHY SOFTWARE PACKAGE LICENSE).
*
* The program is only for reference, which is distributed in the hope
* that it will be usefull and instructional for customers to develop
* their software. Unless required by applicable law or agreed to in
* writing, the program is distributed on an "AS IS" BASIS, WITHOUT
* ANY WARRANTY OR CONDITIONS OF ANY KIND, either express or implied.
* See the GEEHY SOFTWARE PACKAGE LICENSE for the governing permissions
* and limitations under the License.
*/
#include "apm32f4xx_rng.h"
#include "apm32f4xx_rcm.h"
/** @addtogroup APM32F4xx_StdPeriphDriver
@{
*/
/** @defgroup RNG_Driver
* @brief RNG driver modules
@{
*/
/** @defgroup RNG_Functions
@{
*/
/*!
* @brief Reset RNG peripheral registers to their default reset values.
*
* @param None
*
* @retval None
*/
void RNG_Reset(void)
{
RCM_EnableAHB2PeriphReset(RCM_AHB2_PERIPH_RNG);
RCM_DisableAHB2PeriphReset(RCM_AHB2_PERIPH_RNG);
}
/*!
* @brief Enable the RNG peripheral.
*
* @param None
*
* @retval None
*/
void RNG_Enable(void)
{
RNG->CTRL_B.RNGEN = BIT_SET;
}
/*!
* @brief Disable the RNG peripheral.
*
* @param None
*
* @retval None
*/
void RNG_Disable(void)
{
RNG->CTRL_B.RNGEN = BIT_RESET;
}
/*!
* @brief Read the 32-bit random number.
*
* @param None
*
* @retval a 32-bit random number.
*/
uint32_t RNG_ReadRandomNumber(void)
{
return RNG->DATA;
}
/*!
* @brief Enable the RNG interrupt.
*
* @param None
*
* @retval None
*/
void EnableInterrupt(void)
{
RNG->CTRL_B.INTEN = BIT_SET;
}
/*!
* @brief Disable the RNG interrupt.
*
* @param None
*
* @retval None
*/
void DisableInterrupt(void)
{
RNG->CTRL_B.INTEN = BIT_RESET;
}
/*!
* @brief Read the specified RNG flag.
*
* @param flag: specifies the RNG flag to check.
* This parameter can be one of the following values:
* @arg RNG_FLAG_DATARDY : Data Ready flag.
* @arg RNG_FLAG_CLKERCSTS: RNG clock error flag.
* @arg RNG_FLAG_FSCSTS : Faulty sequence flag.
*
* @retval SET or RESET
*/
uint8_t RNG_ReadStatusFlag(RNG_FLAG_T flag)
{
if ((RNG->STS & flag) != RESET)
{
return SET;
}
else
{
return RESET;
}
}
/*!
* @brief Clears the RNG flags.
*
* @param flag: specifies the flag to clear.
* This parameter can be any combination of the following values:
* @arg RNG_FLAG_CLKERCSTS: RNG clock error flag.
* @arg RNG_FLAG_FSCSTS : Faulty sequence flag.
*
* @note RNG_FLAG_DATARDY can not be cleared only by reading the Random data
* (using RNG_ReadRandomNumber() function).
*
* @retval None
*/
void RNG_ClearStatusFlag(uint8_t flag)
{
RNG->STS = ~(uint32_t)(((uint32_t)flag) << 4);
}
/*!
* @brief Read the specified RNG interrupt flag.
*
* @param flag: check status of specifies the RNG interrupt source.
* This parameter can be one of the following values:
* @arg RNG_INT_FLAG_CLKERINT: RNGCLK Error Interrupt.
* @arg RNG_INT_FLAG_FSINT : Faulty Sequence Interrupt.
*
* @retval SET or RESET
*/
uint8_t RNG_ReadIntFlag(RNG_INT_FLAG_T flag)
{
if ((RNG->STS & flag) != RESET)
{
return SET;
}
else
{
return RESET;
}
}
/*!
* @brief Clears the RNG interrupt flags.
*
* @param flag: clear flag specifies the RNG interrupt flag.
* This parameter can be any combination of the following values:
* @arg RNG_INT_FLAG_CLKERINT: RNGCLK Error Interrupt flag.
* @arg RNG_INT_FLAG_FSINT : Faulty Sequence Interrupt flag.
*
* @retval None
*/
void RNG_ClearIntFlag(uint8_t flag)
{
RNG->STS = (uint8_t)~flag;
}
/**@} end of group RNG_Functions */
/**@} end of group RNG_Driver */
/**@} end of group APM32F4xx_StdPeriphDriver */
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