贡献一个开源的“真随机数”发生函数

test01

1. /* This Source Code Form is subject to the terms of the Mozilla Public
   
2. * License, v. 2.0. If a copy of the MPL was not distributed with this
   
3. * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   
4. 
   
5. #include <stdlib.h>
   
6. 
   
7. void generating_random_seed (uint_fast16_t seed_width, uint16_t seed_bits[])  //Occupied A7 pin. Arduino with the statement.
   
8. {
   
9.   const uint_fast16_t MAX_WIDTH = 256;
   
10.   const uint_fast8_t NOISE_INPIT_PIN = A7;
    
11.   
    
12.   if ((seed_width <= 0) and (seed_width > MAX_WIDTH))
    
13.   {
    
14.     return;
    
15.   }
    
16. 
    
17.   analogReference(INTERNAL);  //Arduino with the statement
    
18.   uint_fast8_t analog_bit_n0, analog_bit_n1;
    
19.   uint16_t analog_bits;
    
20.   int_fast8_t n = 0;
    
21.   analog_bit_n0 = read_bit(analogRead(NOISE_INPIT_PIN), 16, 0);  //Arduino with the statement
    
22.   while (n < 16)
    
23.   {
    
24.     analog_bit_n1 = read_bit(analogRead(NOISE_INPIT_PIN), 16, 0);  //Arduino with the statement
    
25.     if (analog_bit_n0 not_eq analog_bit_n1)
    
26.     {
    
27.       analog_bits = xor_bit(analog_bits, 16, n, (analog_bit_n0 > analog_bit_n1) ? 0 : 1);
    
28.       analog_bit_n0 = read_bit(analogRead(NOISE_INPIT_PIN), 16, 0);  //Arduino with the statement
    
29.       ++n;
    
30.     }
    
31.     else
    
32.     {
    
33.       analog_bit_n0 = analog_bit_n1;
    
34.     }
    
35.   }
    
36.   srand(analog_bits);
    
37.   
    
38.   const uint16_t WORD_10 = (((uint16_t)B10101010) << 8) | B10101010;
    
39.   const uint16_t WORD_01 = compl WORD_10;
    
40.   const uint16_t WORD_11 = compl((uint16_t)0);
    
41.   div_t array_length = div(seed_width - 1, 16);
    
42.   uint16_t initialization_bits;
    
43.   ((rand() % 2) == 0) ? initialization_bits = WORD_10 : initialization_bits = WORD_01;
    
44.   for (int_fast8_t i = 0; i <= array_length.quot; ++i)
    
45.   {
    
46.     seed_bits[i] = initialization_bits;
    
47.   }
    
48.   seed_bits[array_length.quot] and_eq compl(WORD_11 << (array_length.rem + 1));
    
49.   
    
50.   analog_bit_n0 = read_bit(analogRead(NOISE_INPIT_PIN), 16, 0);  //Arduino with the statement
    
51.   for (int_fast16_t i = (int_fast16_t)seed_width * 3 - 1; i >= 0; --i)
    
52.   {
    
53.     ldiv_t seed_pointer = ldiv((int_fast32_t)seed_width * rand() / ((uint_fast16_t)RAND_MAX + 1), 16);
    
54.     analog_bit_n1 = read_bit(analogRead(NOISE_INPIT_PIN), 16, 0);  //Arduino with the statement
    
55.     if (analog_bit_n0 not_eq analog_bit_n1)
    
56.     {
    
57.       seed_bits[seed_pointer.quot] = xor_bit(seed_bits[seed_pointer.quot], 16, seed_pointer.rem, (analog_bit_n0 > analog_bit_n1) ? 0 : 1);
    
58.       analog_bit_n0 = read_bit(analogRead(NOISE_INPIT_PIN), 16, 0);  //Arduino with the statement
    
59.     }
    
60.     else
    
61.     {
    
62.       analog_bit_n0 = analog_bit_n1;
    
63.     }
    
64.   }
    
65. }

复制代码

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说明：这用了A7模拟输入脚，让A7接一根悬空的长引线效果好
可生成1位到256位的真随机数
注意，受avr里的adc所限，产生的随机数如果要用在质量要求高的应用，一定先行检验是否符合要求
欢迎大家来检验这个发生器的随机性

迷你强

{:soso_e103:}，好东西。。。改天抽样测评下。。

test01

修正一个bug，65行里是ldiv_t和ldiv，不是div_t和div

test01

为更方便大家应用，变更了开源许可证

迷你强

test01

晕死
漏写了#include <stdlib.h>