180 lines
3.4 KiB
C
180 lines
3.4 KiB
C
/**
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******************************************************************************
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* @file
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* @author
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* @version
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* @date
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* @brief 偽隨機數
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* @function List:
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******************************************************************************
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* @attention
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*
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*
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* <h2><center>© COPYRIGHT 2021 </center></h2>
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******************************************************************************
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* @History:
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* @Author:
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* @Data:
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* @Version:
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*/
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#include "common_types.h"
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//#include "error.h"
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#include "crc.h"
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#include "adc.h"
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#include "random_pseudo.h"
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//#include "adc.h"
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#include "service_27.h"
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//#include "common_timer.h"
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#define RAND_SEED_INIT_VAL 1u /* See Note #1a. */
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#define RAND_LCG_PARAM_M 0x7FFFFFFFu /* See Note #1b2B. */
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#define RAND_LCG_PARAM_A 1103515245u /* See Note #1b1A2. */
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#define RAND_LCG_PARAM_B 12345u /* See Note #1b1A3. */
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static u32 random_seed_cur=0; //当前随机数值
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static u32 random_seed_pre=0; //上次随机数值
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static u32 random_input1_count=0;
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static void random_set_seed(u32 seed);
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static u32 random_seed(u32 seed);
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static u32 random_generate_seed(void);
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/**
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* @brief 初始化
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* @param input:
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* @param output:
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* @return none:
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* @calls
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* @calls by
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* @others 注意，不能初始值为一个固定值，应考虙每个单片机的不同；在定时器初始化之后
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*/
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void random_init(void)
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{
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u32 l_random;
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#if 0
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random_set_seed(RAND_SEED_INIT_VAL); //第一次
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#else
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l_random = adc_get_voltage_value(ADC_CHANNEL_SBAT); //定时器0寄存器的计数值
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random_set_seed(l_random); //第一次
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#endif
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}
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static void random_set_seed(u32 seed)
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{
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random_seed_cur = seed;
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}
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/**
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* @brief 算法
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* @param input:
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* @param output:
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* @return none:
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* @calls
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* @calls by
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* @others
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*/
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static u32 random_seed(u32 seed)
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{
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u32 l_random;
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l_random = ( ( (u32)RAND_LCG_PARAM_A * seed) + (u32)RAND_LCG_PARAM_B) % ((u32)RAND_LCG_PARAM_M + 1u);
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return l_random;
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}
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/**
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* @brief 产生随机数
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* @param input:
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* @param output:
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* @return none:
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* @calls
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* @calls by
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* @others
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*/
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static u32 random_generate_seed(void)
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{
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u32 l_random;
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l_random = random_seed_cur;
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random_seed_cur = random_seed(l_random + adc_get_voltage_value(ADC_CHANNEL_SBAT) + random_input1_count);
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return random_seed_cur;
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}
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/**
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* @brief 启动一次随机数的产生；
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* @param input:
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* @param output:
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* @return none:
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* @calls
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* @calls by
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* @others 防止连续两次不重复
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*/
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void random_start(void)
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{
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(void)random_generate_seed();
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if( random_seed_cur == random_seed_pre)
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{
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random_seed_cur++;
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}
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else
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{
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}
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random_seed_pre = random_seed_cur;
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}
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/**
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* @brief 返回当前随机数
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* @param input:
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* @param output:
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* @return none:
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* @calls
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* @calls by
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* @others
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*/
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void random_get(u8 *random_data,u8 random_len)
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{
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//u8 i;
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u8 l_len = random_len;
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if(l_len > SERVICE_SEED_LEN_VALID)
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{
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//l_len =SERVICE_SEED_LEN_VALID;
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}
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random_data[0] = (u8)(random_seed_cur >> 24);
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random_data[1] = (u8)(random_seed_cur >> 16);
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random_data[2] = (u8)(random_seed_cur >> 8);
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random_data[3] = (u8)(random_seed_cur);
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}
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void random_input_count(void)
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{
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random_input1_count++;
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}
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