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/*******************************************************************************
* Copyright (C) 2020, Huada Semiconductor Co., Ltd. All rights reserved.
*
* This software component is licensed by HDSC under BSD 3-Clause license
* (the "License"); You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*/
/******************************************************************************/
/** \file hc32f460_trng.c
**
** A detailed description is available at
** @link TrngGroup Trng description @endlink
**
** - 2018-10-20 CDT First version for Device Driver Library of Trng.
**
******************************************************************************/
/*******************************************************************************
* Include files
******************************************************************************/
#include "hc32f460_trng.h"
#include "hc32f460_utility.h"
#include <system_hc32f460.h>
/**
*******************************************************************************
** \addtogroup TrngGroup
******************************************************************************/
//@{
/*******************************************************************************
* Local type definitions ('typedef')
******************************************************************************/
/*******************************************************************************
* Local pre-processor symbols/macros ('#define')
******************************************************************************/
/*! Parameter validity check for TRNG load control. */
#define IS_TRNG_LOAD_CTRL(CTRL) \
( ((CTRL) == TrngLoadNewInitValue_Enable) || \
((CTRL) == TrngLoadNewInitValue_Disable))
/*! Parameter validity check for TRNG shift count. */
#define IS_TRNG_SHIFT_COUNT(COUNT) \
( ((COUNT) == TrngShiftCount_32) || \
((COUNT) == TrngShiftCount_64) || \
((COUNT) == TrngShiftCount_128) || \
((COUNT) == TrngShiftCount_256))
#define RANDOM_NUM_LENGTH (2u)
/*******************************************************************************
* Global variable definitions (declared in header file with 'extern')
******************************************************************************/
/*******************************************************************************
* Local function prototypes ('static')
******************************************************************************/
/*******************************************************************************
* Local variable definitions ('static')
******************************************************************************/
/*******************************************************************************
* Function implementation - global ('extern') and local ('static')
******************************************************************************/
/**
*******************************************************************************
** \brief Initializes the TRNG.
**
** \param [in] pstcInit Pointer to TRNG initialization structure.
** \arg enLoadCtrl
** \- TrngLoadNewInitValue_Enable Data register load new initial value before
** random number is generated.
** \- TrngLoadNewInitValue_Disable Data register do not load new initial value
** before random number is generated.
**
** \arg enShiftCount Shift count control bit when capturing random noise.
** \- TrngShiftCount_32 Shift 32 times.
** \- TrngShiftCount_64 Shift 64 times.
** \- TrngShiftCount_128 Shift 128 times.
** \- TrngShiftCount_256 Shift 256 times.
**
** \retval Ok No error occurred.
** \retval ErrorInvalidParameter Parameter error.
**
******************************************************************************/
en_result_t TRNG_Init(const stc_trng_init_t *pstcInit)
{
en_result_t enRet = ErrorInvalidParameter;
if (NULL != pstcInit)
{
/* Parameter validity check */
DDL_ASSERT(IS_TRNG_LOAD_CTRL(pstcInit->enLoadCtrl));
DDL_ASSERT(IS_TRNG_SHIFT_COUNT(pstcInit->enShiftCount));
/* Stop TRNG generating*/
bM4_TRNG_CR_RUN = 0u;
/* Turn off TRNG circuit */
bM4_TRNG_CR_EN = 0u;
M4_TRNG->MR_f.LOAD = pstcInit->enLoadCtrl;
M4_TRNG->MR_f.CNT = pstcInit->enShiftCount;
enRet = Ok;
}
return enRet;
}
/**
*******************************************************************************
** \brief Deinitializes the TRNG.
**
** \param None.
**
** \retval None.
**
******************************************************************************/
void TRNG_DeInit(void)
{
/* Stop TRNG generating*/
bM4_TRNG_CR_RUN = 0u;
/* Turn off TRNG circuit */
bM4_TRNG_CR_EN = 0u;
/* Set the value of all registers to the reset value. */
M4_TRNG->CR = 0u;
M4_TRNG->MR = 0x12ul;
M4_TRNG->DR0 = 0x08000000ul;
M4_TRNG->DR0 = 0x08000200ul;
}
/**
*******************************************************************************
** \brief Start TRNG and generate random number.
**
** \param [out] pu32Random The destination address where the random
** number will be stored.
** \param [in] u8Length Random number length(in word).
** TRNG generates two random numbers(2 words) at one time.
** u8Length >= 2, both random numbers will be read.
** u8Length < 2, only one random number will be read.
** \param [in] u32Timeout Timeout value.
**
** \retval Ok No error occurred.
** \retval ErrorTimeout TRNG works timeout.
** \retval ErrorInvalidParameter Parameter error.
**
******************************************************************************/
en_result_t TRNG_Generate(uint32_t *pu32Random, uint8_t u8Length, uint32_t u32Timeout)
{
en_result_t enRet = ErrorInvalidParameter;
uint32_t u32TrngTimeout;
__IO uint32_t u32TimeCount;
if ((NULL != pu32Random) && (0u != u32Timeout) && (0u != u8Length))
{
/* 10 is the number of required instructions cycles for the below loop statement. */
u32TrngTimeout = u32Timeout * (SystemCoreClock / 10u / 1000u);
/* Turn on TRNG circuit. */
bM4_TRNG_CR_EN = 1u;
/* Start TRNG to generate random number. */
bM4_TRNG_CR_RUN = 1u;
/* wait generation done and check if timeout. */
u32TimeCount = 0u;
enRet = ErrorTimeout;
while (u32TimeCount < u32TrngTimeout)
{
if (bM4_TRNG_CR_RUN == 0u)
{
enRet = Ok;
break;
}
u32TimeCount++;
}
if (Ok == enRet)
{
/* read the random number. */
pu32Random[0u] = M4_TRNG->DR0;
if (u8Length >= RANDOM_NUM_LENGTH)
{
pu32Random[1u] = M4_TRNG->DR1;
}
}
/* Stop TRNG generating. */
bM4_TRNG_CR_RUN = 0u;
/* Turn off TRNG circuit. */
bM4_TRNG_CR_EN = 0u;
}
return enRet;
}
/**
*******************************************************************************
** \brief Start TRNG only.
**
** \param None.
**
** \retval None.
**
******************************************************************************/
void TRNG_StartIT(void)
{
/* Turn on TRNG circuit. */
bM4_TRNG_CR_EN = 1u;
/* Start TRNG to generate random number. */
bM4_TRNG_CR_RUN = 1u;
}
/**
*******************************************************************************
** \brief Get random number.
**
** \param [out] pu32Random The destination address where the random
** number will be stored.
** \param [in] u8Length Random number length(in word).
** TRNG generates two random numbers(2 words) at one time.
** u8Length >= 2, both random numbers will be read.
** u8Length < 2, only one random number will be read.
**
** \retval None.
**
******************************************************************************/
void TRNG_GetRandomNum(uint32_t *pu32Random, uint8_t u8Length)
{
if ((NULL != pu32Random) && (0u != u8Length))
{
pu32Random[0u] = M4_TRNG->DR0;
if (u8Length >= RANDOM_NUM_LENGTH)
{
pu32Random[1u] = M4_TRNG->DR1;
}
/* Stop TRNG generating */
bM4_TRNG_CR_RUN = 0u;
/* Turn off TRNG circuit */
bM4_TRNG_CR_EN = 0u;
}
}
//@} // TrngGroup
/*******************************************************************************
* EOF (not truncated)
******************************************************************************/
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