Knight KE / Mbed OS Game_Master

游戏王对战板，目前code还是空的

mbed-os/targets/TARGET_STM/trng_api.c@0:9b3d4731edbb, 2018-06-21 (annotated)

Committer:
WFKnight
Date:
Thu Jun 21 13:51:43 2018 +0000
Revision:
0:9b3d4731edbb
UART, RTOS, LED

Who changed what in which revision?

UserRevisionLine numberNew contents of line
WFKnight 0:9b3d4731edbb 1 /*
WFKnight 0:9b3d4731edbb 2 * Hardware entropy collector for the STM32 families
WFKnight 0:9b3d4731edbb 3 *
WFKnight 0:9b3d4731edbb 4 * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
WFKnight 0:9b3d4731edbb 5 * SPDX-License-Identifier: Apache-2.0
WFKnight 0:9b3d4731edbb 6 *
WFKnight 0:9b3d4731edbb 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
WFKnight 0:9b3d4731edbb 8 * not use this file except in compliance with the License.
WFKnight 0:9b3d4731edbb 9 * You may obtain a copy of the License at
WFKnight 0:9b3d4731edbb 10 *
WFKnight 0:9b3d4731edbb 11 * http://www.apache.org/licenses/LICENSE-2.0
WFKnight 0:9b3d4731edbb 12 *
WFKnight 0:9b3d4731edbb 13 * Unless required by applicable law or agreed to in writing, software
WFKnight 0:9b3d4731edbb 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WFKnight 0:9b3d4731edbb 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
WFKnight 0:9b3d4731edbb 16 * See the License for the specific language governing permissions and
WFKnight 0:9b3d4731edbb 17 * limitations under the License.
WFKnight 0:9b3d4731edbb 18 *
WFKnight 0:9b3d4731edbb 19 */
WFKnight 0:9b3d4731edbb 20
WFKnight 0:9b3d4731edbb 21 #if defined(DEVICE_TRNG)
WFKnight 0:9b3d4731edbb 22
WFKnight 0:9b3d4731edbb 23 #include <stdlib.h>
WFKnight 0:9b3d4731edbb 24 #include "cmsis.h"
WFKnight 0:9b3d4731edbb 25 #include "trng_api.h"
WFKnight 0:9b3d4731edbb 26 #include "mbed_error.h"
WFKnight 0:9b3d4731edbb 27 #include "mbed_critical.h"
WFKnight 0:9b3d4731edbb 28
WFKnight 0:9b3d4731edbb 29 static uint8_t users = 0;
WFKnight 0:9b3d4731edbb 30
WFKnight 0:9b3d4731edbb 31 void trng_init(trng_t *obj)
WFKnight 0:9b3d4731edbb 32 {
WFKnight 0:9b3d4731edbb 33 uint32_t dummy;
WFKnight 0:9b3d4731edbb 34
WFKnight 0:9b3d4731edbb 35 /* We're only supporting a single user of RNG */
WFKnight 0:9b3d4731edbb 36 if (core_util_atomic_incr_u8(&users, 1) > 1 ) {
WFKnight 0:9b3d4731edbb 37 error("Only 1 RNG instance supported\r\n");
WFKnight 0:9b3d4731edbb 38 }
WFKnight 0:9b3d4731edbb 39
WFKnight 0:9b3d4731edbb 40 #if defined(TARGET_STM32L4)
WFKnight 0:9b3d4731edbb 41 RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
WFKnight 0:9b3d4731edbb 42
WFKnight 0:9b3d4731edbb 43 /*Select PLLQ output as RNG clock source */
WFKnight 0:9b3d4731edbb 44 PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RNG;
WFKnight 0:9b3d4731edbb 45 PeriphClkInitStruct.RngClockSelection = RCC_RNGCLKSOURCE_PLL;
WFKnight 0:9b3d4731edbb 46 HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
WFKnight 0:9b3d4731edbb 47 #endif
WFKnight 0:9b3d4731edbb 48
WFKnight 0:9b3d4731edbb 49 /* RNG Peripheral clock enable */
WFKnight 0:9b3d4731edbb 50 __HAL_RCC_RNG_CLK_ENABLE();
WFKnight 0:9b3d4731edbb 51
WFKnight 0:9b3d4731edbb 52 /* Initialize RNG instance */
WFKnight 0:9b3d4731edbb 53 obj->handle.Instance = RNG;
WFKnight 0:9b3d4731edbb 54 obj->handle.State = HAL_RNG_STATE_RESET;
WFKnight 0:9b3d4731edbb 55 obj->handle.Lock = HAL_UNLOCKED;
WFKnight 0:9b3d4731edbb 56
WFKnight 0:9b3d4731edbb 57 HAL_RNG_Init(&obj->handle);
WFKnight 0:9b3d4731edbb 58
WFKnight 0:9b3d4731edbb 59 /* first random number generated after setting the RNGEN bit should not be used */
WFKnight 0:9b3d4731edbb 60 HAL_RNG_GenerateRandomNumber(&obj->handle, &dummy);
WFKnight 0:9b3d4731edbb 61 }
WFKnight 0:9b3d4731edbb 62
WFKnight 0:9b3d4731edbb 63 void trng_free(trng_t *obj)
WFKnight 0:9b3d4731edbb 64 {
WFKnight 0:9b3d4731edbb 65 /*Disable the RNG peripheral */
WFKnight 0:9b3d4731edbb 66 HAL_RNG_DeInit(&obj->handle);
WFKnight 0:9b3d4731edbb 67 /* RNG Peripheral clock disable - assume we're the only users of RNG */
WFKnight 0:9b3d4731edbb 68 __HAL_RCC_RNG_CLK_DISABLE();
WFKnight 0:9b3d4731edbb 69
WFKnight 0:9b3d4731edbb 70 users = 0;
WFKnight 0:9b3d4731edbb 71 }
WFKnight 0:9b3d4731edbb 72
WFKnight 0:9b3d4731edbb 73 int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length)
WFKnight 0:9b3d4731edbb 74 {
WFKnight 0:9b3d4731edbb 75 int ret = 0;
WFKnight 0:9b3d4731edbb 76 volatile uint8_t random[4];
WFKnight 0:9b3d4731edbb 77 *output_length = 0;
WFKnight 0:9b3d4731edbb 78
WFKnight 0:9b3d4731edbb 79 /* Get Random byte */
WFKnight 0:9b3d4731edbb 80 while ((*output_length < length) && (ret ==0)) {
WFKnight 0:9b3d4731edbb 81 if ( HAL_RNG_GenerateRandomNumber(&obj->handle, (uint32_t *)random ) != HAL_OK) {
WFKnight 0:9b3d4731edbb 82 ret = -1;
WFKnight 0:9b3d4731edbb 83 } else {
WFKnight 0:9b3d4731edbb 84 for (uint8_t i =0; (i < 4) && (*output_length < length) ; i++) {
WFKnight 0:9b3d4731edbb 85 *output++ = random[i];
WFKnight 0:9b3d4731edbb 86 *output_length += 1;
WFKnight 0:9b3d4731edbb 87 random[i] = 0;
WFKnight 0:9b3d4731edbb 88 }
WFKnight 0:9b3d4731edbb 89 }
WFKnight 0:9b3d4731edbb 90 }
WFKnight 0:9b3d4731edbb 91
WFKnight 0:9b3d4731edbb 92 /* Just be extra sure that we didn't do it wrong */
WFKnight 0:9b3d4731edbb 93 if( ( __HAL_RNG_GET_FLAG(&obj->handle, (RNG_FLAG_CECS | RNG_FLAG_SECS)) ) != 0 ) {
WFKnight 0:9b3d4731edbb 94 ret = -1;
WFKnight 0:9b3d4731edbb 95 }
WFKnight 0:9b3d4731edbb 96
WFKnight 0:9b3d4731edbb 97 return( ret );
WFKnight 0:9b3d4731edbb 98 }
WFKnight 0:9b3d4731edbb 99
WFKnight 0:9b3d4731edbb 100 #endif