1 /*
2 * Copyright (c) 2022 OpenLuat & AirM2M
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy of
5 * this software and associated documentation files (the "Software"), to deal in
6 * the Software without restriction, including without limitation the rights to
7 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
8 * the Software, and to permit persons to whom the Software is furnished to do so,
9 * subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in all
12 * copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
16 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
17 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
18 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 */
21
22 #include "user.h"
23
RNG_Init(void)24 void RNG_Init(void)
25 {
26 TRNG->RNG_ANA = 0;
27 TRNG->RNG_CSR = 0;
28 }
29 /**
30 * @brief 获取随机数
31 *
32 * @param Buf，一次获取4个32bit数据
33 */
RNG_GetData(uint32_t Buf[4])34 void RNG_GetData(uint32_t Buf[4])
35 {
36 if (TRNG->RNG_CSR & TRNG_RNG_CSR_S128_TRNG0_Mask)
37 {
38 ;
39 }
40 else
41 {
42 TRNG->RNG_CSR = 0;
43 while(!(TRNG->RNG_CSR & TRNG_RNG_CSR_S128_TRNG0_Mask)){;}
44 }
45 Buf[0] = TRNG->RNG_DATA[0];
46 Buf[1] = TRNG->RNG_DATA[0];
47 Buf[2] = TRNG->RNG_DATA[0];
48 Buf[3] = TRNG->RNG_DATA[0];
49 TRNG->RNG_CSR = 0;
50
51
52 }
53