121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
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/*
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******************************************************************************
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* @file driver_trng.c
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* @author FreqChip Firmware Team
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* @version V1.0.0
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* @date 2023
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* @brief TRNG module driver.
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* This file provides firmware functions to manage the
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* True Random Number Generator (TRNG) peripheral.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2023 FreqChip.
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* All rights reserved.
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******************************************************************************
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*/
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#include "fr30xx.h"
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static int trng_sel_smp_verify(int Rand_sel_index, int Sample_cnt_index)
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{
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int Error;
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TRNG->TRNG_IMR = 0XFFFFFF00;
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TRNG->TRNG_SrcEN = 0;
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TRNG->TRNG_DebugControl = 0;
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/* Selects the number of inverters in the ring oscillator */
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TRNG->TRNG_Config = Rand_sel_index;
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while((TRNG->TRNG_Config & Rand_sel_index) != Rand_sel_index);
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TRNG->TRNG_SAMPLE_CNT1 = Sample_cnt_index;
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while((TRNG->TRNG_SAMPLE_CNT1 & Sample_cnt_index) != Sample_cnt_index);
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TRNG->TRNG_AUTOCORR = 0;
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TRNG->TRNG_SrcEN = 1;
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while(!(TRNG->TRNG_ISR));
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if (TRNG->TRNG_ISR & TRNG_STATUS_EHR_VALID)
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Error = 0;
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else
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Error = 1;
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if (Error)
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{
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TRNG->TRNG_Reset = 1;
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}
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TRNG->TRNG_ICR = 0XFFFFFFFF;
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return !Error;
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}
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/************************************************************************************
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* @fn trng_init
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*
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* @brief trng init.
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*/
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void trng_init(void)
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{
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#define MAX_SAMPLE_CNT_INDX (0xFFFFFF00)
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uint32_t Rand_sel_index;
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uint32_t Sample_cnt_index;
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uint32_t Rand_Sample_Passed;
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for (Rand_sel_index = 1; Rand_sel_index < 4; Rand_sel_index++)
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{
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Rand_Sample_Passed = 0;
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Sample_cnt_index = 33333;
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do{
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Rand_Sample_Passed = trng_sel_smp_verify(Rand_sel_index, Sample_cnt_index);
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Sample_cnt_index += 111;
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} while ((Sample_cnt_index <= (MAX_SAMPLE_CNT_INDX)) && !Rand_Sample_Passed);
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while(TRNG->TRNG_BIST_CNTR0 <= 0);
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while(TRNG->TRNG_BIST_CNTR1 <= 0);
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while(TRNG->TRNG_BIST_CNTR2 <= 0);
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if (Rand_Sample_Passed)
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break;
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}
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TRNG->TRNG_SrcEN = 0;
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}
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/************************************************************************************
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* @fn trng_read_rand_num
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*
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* @brief Read random numbers.
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*
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* @param fp_buffer: random numbers buffer.
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* @param length: random numbers length, max 24 byte.
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*/
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void trng_read_rand_num(uint8_t *fp_buffer, uint8_t length)
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{
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int i;
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uint32_t lu32_buffer[6];
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uint8_t *Point = (uint8_t *)lu32_buffer;
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if (length > 24)
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length = 24;
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/* TRNG enable */
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TRNG->TRNG_SrcEN = 1;
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/* Wait VALID */
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while(!(TRNG->TRNG_ISR & TRNG_STATUS_EHR_VALID));
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for(int i = 0; i < 6; i++)
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lu32_buffer[i] = TRNG->TRNG_Data[i];
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for (int i = 0; i < length; i++)
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fp_buffer[i] = Point[i];
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/* TRNG disable */
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TRNG->TRNG_SrcEN = 0;
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/* Clear status */
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TRNG->TRNG_ICR = TRNG_STATUS_EHR_VALID;
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}
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