MacroRat / MouseCode

Mouse code for the MacroRat

Dependencies:   ITG3200 QEI

mbed-dev/targets/TARGET_ONSEMI/TARGET_NCS36510/ncs36510_trng_api.c@46:b156ef445742, 2017-06-03 (annotated)

Committer:
sahilmgandhi
Date:
Sat Jun 03 00:22:44 2017 +0000
Revision:
46:b156ef445742
Parent:
18:6a4db94011d3 
Final code for internal battlebot competition.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sahilmgandhi 18:6a4db94011d3 1 /**
sahilmgandhi 18:6a4db94011d3 2 ******************************************************************************
sahilmgandhi 18:6a4db94011d3 3 * @file trng_api.c
sahilmgandhi 18:6a4db94011d3 4 * @brief Implementation of TRNG functionality.
sahilmgandhi 18:6a4db94011d3 5 * @internal
sahilmgandhi 18:6a4db94011d3 6 * @author ON Semiconductor.
sahilmgandhi 18:6a4db94011d3 7 * $Rev: $
sahilmgandhi 18:6a4db94011d3 8 * $Date: $
sahilmgandhi 18:6a4db94011d3 9 ******************************************************************************
sahilmgandhi 18:6a4db94011d3 10 * Copyright 2016 Semiconductor Components Industries LLC (d/b/a “ON Semiconductor”).
sahilmgandhi 18:6a4db94011d3 11 * All rights reserved. This software and/or documentation is licensed by ON Semiconductor
sahilmgandhi 18:6a4db94011d3 12 * under limited terms and conditions. The terms and conditions pertaining to the software
sahilmgandhi 18:6a4db94011d3 13 * and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf
sahilmgandhi 18:6a4db94011d3 14 * (“ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software”) and
sahilmgandhi 18:6a4db94011d3 15 * if applicable the software license agreement. Do not use this software and/or
sahilmgandhi 18:6a4db94011d3 16 * documentation unless you have carefully read and you agree to the limited terms and
sahilmgandhi 18:6a4db94011d3 17 * conditions. By using this software and/or documentation, you agree to the limited
sahilmgandhi 18:6a4db94011d3 18 * terms and conditions.
sahilmgandhi 18:6a4db94011d3 19 *
sahilmgandhi 18:6a4db94011d3 20 * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
sahilmgandhi 18:6a4db94011d3 21 * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
sahilmgandhi 18:6a4db94011d3 22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
sahilmgandhi 18:6a4db94011d3 23 * ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL,
sahilmgandhi 18:6a4db94011d3 24 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
sahilmgandhi 18:6a4db94011d3 25 * @endinternal
sahilmgandhi 18:6a4db94011d3 26 *
sahilmgandhi 18:6a4db94011d3 27 * @ingroup TRNG
sahilmgandhi 18:6a4db94011d3 28 *
sahilmgandhi 18:6a4db94011d3 29 */
sahilmgandhi 18:6a4db94011d3 30 #if DEVICE_TRNG
sahilmgandhi 18:6a4db94011d3 31
sahilmgandhi 18:6a4db94011d3 32 /*************************************************************************************************
sahilmgandhi 18:6a4db94011d3 33 * *
sahilmgandhi 18:6a4db94011d3 34 * Header files *
sahilmgandhi 18:6a4db94011d3 35 * *
sahilmgandhi 18:6a4db94011d3 36 *************************************************************************************************/
sahilmgandhi 18:6a4db94011d3 37 #include "trng_api.h"
sahilmgandhi 18:6a4db94011d3 38 #include "memory_map.h"
sahilmgandhi 18:6a4db94011d3 39 #include "ncs36510_trng.h"
sahilmgandhi 18:6a4db94011d3 40 #include "clock.h"
sahilmgandhi 18:6a4db94011d3 41 #include "mbed_wait_api.h"
sahilmgandhi 18:6a4db94011d3 42
sahilmgandhi 18:6a4db94011d3 43 /*************************************************************************************************
sahilmgandhi 18:6a4db94011d3 44 * *
sahilmgandhi 18:6a4db94011d3 45 * Functions *
sahilmgandhi 18:6a4db94011d3 46 * *
sahilmgandhi 18:6a4db94011d3 47 *************************************************************************************************/
sahilmgandhi 18:6a4db94011d3 48
sahilmgandhi 18:6a4db94011d3 49
sahilmgandhi 18:6a4db94011d3 50 void trng_init(trng_t *obj)
sahilmgandhi 18:6a4db94011d3 51 {
sahilmgandhi 18:6a4db94011d3 52 /* Enable TRNG */
sahilmgandhi 18:6a4db94011d3 53 CLOCK_ENABLE(CLOCK_RAND);
sahilmgandhi 18:6a4db94011d3 54
sahilmgandhi 18:6a4db94011d3 55 /* Initialize TRNG */
sahilmgandhi 18:6a4db94011d3 56 RANDREG->CONTROL.WORD = False;
sahilmgandhi 18:6a4db94011d3 57
sahilmgandhi 18:6a4db94011d3 58 return;
sahilmgandhi 18:6a4db94011d3 59 }
sahilmgandhi 18:6a4db94011d3 60 void trng_free(trng_t *obj)
sahilmgandhi 18:6a4db94011d3 61 {
sahilmgandhi 18:6a4db94011d3 62 /* Stop TRNG */
sahilmgandhi 18:6a4db94011d3 63 RANDREG->CONTROL.WORD = False;
sahilmgandhi 18:6a4db94011d3 64
sahilmgandhi 18:6a4db94011d3 65 /* Disable TRNG */
sahilmgandhi 18:6a4db94011d3 66 CLOCK_DISABLE(CLOCK_RAND);
sahilmgandhi 18:6a4db94011d3 67
sahilmgandhi 18:6a4db94011d3 68 return;
sahilmgandhi 18:6a4db94011d3 69 }
sahilmgandhi 18:6a4db94011d3 70
sahilmgandhi 18:6a4db94011d3 71 int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length)
sahilmgandhi 18:6a4db94011d3 72 {
sahilmgandhi 18:6a4db94011d3 73 uint32_t MSLRandom = 0, Index, TempLen, *TempPtr = (uint32_t*)output;
sahilmgandhi 18:6a4db94011d3 74
sahilmgandhi 18:6a4db94011d3 75 RANDREG->CONTROL.BITS.METASTABLE_LATCH_EN = TRNG_ENABLE; /* ENable MSL TRNG */
sahilmgandhi 18:6a4db94011d3 76 RANDREG->CONTROL.BITS.MEATSTABLE_SPEED = TRNG_FAST_MODE; /* Meta-stable Latch TRNG Speed Control */
sahilmgandhi 18:6a4db94011d3 77 RANDREG->CONTROL.BITS.MODE = TRNG_ON_READ_EVENT; /* TRNG is only updated on a read event of the TRNG register */
sahilmgandhi 18:6a4db94011d3 78
sahilmgandhi 18:6a4db94011d3 79 wait_us(1); /* Wait till MSL generates random number after enable for the first time */
sahilmgandhi 18:6a4db94011d3 80
sahilmgandhi 18:6a4db94011d3 81 TempLen = length / 4;
sahilmgandhi 18:6a4db94011d3 82
sahilmgandhi 18:6a4db94011d3 83 for(Index = 0; Index < TempLen; Index++)
sahilmgandhi 18:6a4db94011d3 84 {
sahilmgandhi 18:6a4db94011d3 85 MSLRandom = RANDREG->METASTABLE_LATCH_VAL;
sahilmgandhi 18:6a4db94011d3 86 *TempPtr++ = MSLRandom ;
sahilmgandhi 18:6a4db94011d3 87 }
sahilmgandhi 18:6a4db94011d3 88
sahilmgandhi 18:6a4db94011d3 89 TempLen = length % 4;
sahilmgandhi 18:6a4db94011d3 90 Index *= 4;
sahilmgandhi 18:6a4db94011d3 91
sahilmgandhi 18:6a4db94011d3 92 if(TempLen-- > 0)
sahilmgandhi 18:6a4db94011d3 93 {
sahilmgandhi 18:6a4db94011d3 94 MSLRandom = RANDREG->METASTABLE_LATCH_VAL;
sahilmgandhi 18:6a4db94011d3 95 *(output + Index++) = (MSLRandom >> 0) & 0xFF;
sahilmgandhi 18:6a4db94011d3 96 if(TempLen-- > 0)
sahilmgandhi 18:6a4db94011d3 97 {
sahilmgandhi 18:6a4db94011d3 98 *(output + Index++) = (MSLRandom >> 8) & 0xFF;
sahilmgandhi 18:6a4db94011d3 99 if(TempLen-- > 0)
sahilmgandhi 18:6a4db94011d3 100 {
sahilmgandhi 18:6a4db94011d3 101 *(output + Index++) = (MSLRandom >> 16) & 0xFF;
sahilmgandhi 18:6a4db94011d3 102 }
sahilmgandhi 18:6a4db94011d3 103 }
sahilmgandhi 18:6a4db94011d3 104 }
sahilmgandhi 18:6a4db94011d3 105
sahilmgandhi 18:6a4db94011d3 106 RANDREG->CONTROL.BITS.METASTABLE_LATCH_EN = TRNG_DISABLE; /* Disable MSL */
sahilmgandhi 18:6a4db94011d3 107
sahilmgandhi 18:6a4db94011d3 108 *output_length = Index;
sahilmgandhi 18:6a4db94011d3 109
sahilmgandhi 18:6a4db94011d3 110 return 0; /* Success */
sahilmgandhi 18:6a4db94011d3 111 }
sahilmgandhi 18:6a4db94011d3 112
sahilmgandhi 18:6a4db94011d3 113 #endif /* DEVICE_TRNG */