#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <stdbool.h>// 定义常量
#define LOW_COOK_WINDOW_SIZE 20                        // 滑动窗口大小，10个样本点（10秒）
#define LOW_COOK_SLOPE_THRESHOLD 0.12f                 // 斜率平缓的阈值
#define LOW_COOK_SAMPLE_INTERVAL 10                    // 采样间隔，单位为100ms
#define LOW_COOK_DEFAULT_TIME_DIFFERENCE 10.0f         // 默认时间间隔为10秒
#define MIN_TIME_DIFFERENCE 1.0f                       // 最小时间间隔为1秒
#define MAX_TIME_DIFFERENCE (LOW_COOK_WINDOW_SIZE - 1) // 最大时间间隔为窗口大小减1// 定义加热系统结构
typedef struct
{float slope;float data[LOW_COOK_WINDOW_SIZE]; // 滑动窗口数据unsigned char count;              // 当前样本数量bool slope_event;                 // 斜率事件unsigned char tim_count;          // 时间片计数器unsigned char state;              // 状态机unsigned char slope_status;       // 状态
} low_cook_heating_system_t;// 全局变量
low_cook_heating_system_t low_cooksystem;// 初始化加热系统
void low_cook_init_heating_system(low_cook_heating_system_t *system)
{system->slope = 0.0f;system->tim_count = 0;system->state = 0;system->count = 0;system->slope_event = false;system->slope_status = 1; // 样本不足for (unsigned char i = 0; i < LOW_COOK_WINDOW_SIZE; i++){system->data[i] = 0.0f;}
}// 添加样本点到滑动窗口，100ms调用一次，1S存数据一次
void low_cook_add_sample(low_cook_heating_system_t *system, float temperature)
{if (++system->tim_count < LOW_COOK_SAMPLE_INTERVAL){return;}system->tim_count = 0;if (system->count < LOW_COOK_WINDOW_SIZE){// 如果窗口未满，直接添加到末尾system->data[system->count++] = temperature;}else{// 如果窗口已满，丢弃最旧的数据，将最新的数据添加到最后的位置for (unsigned char i = 1; i < LOW_COOK_WINDOW_SIZE; i++){system->data[i - 1] = system->data[i];}system->data[LOW_COOK_WINDOW_SIZE - 1] = temperature;}
}// 计算温度斜率
float low_cook_calculate_slope(low_cook_heating_system_t *system, float time_difference)
{// 限制 time_difference 在合理范围内if (time_difference < MIN_TIME_DIFFERENCE || time_difference > MAX_TIME_DIFFERENCE){system->slope_status = 2; // 时间间隔超出范围return 0.0f;}unsigned char interval_samples = (unsigned char)(time_difference); // 计算需要的样本间隔if (system->count < LOW_COOK_WINDOW_SIZE || interval_samples >= system->count){system->slope_status = 1; // 样本不足return 0.0f;}// 获取最新样本点和 interval_samples 前的样本点float current = system->data[system->count - 1];float previous = system->data[system->count - 1 - interval_samples];system->slope_status = 0; // 成功计算斜率// 计算并返回斜率return (current - previous) / time_difference;
}void low_cook_update_slope(float time_difference)
{// 添加新的温度数据到系统中low_cook_add_sample(&low_cooksystem, stheat.temperature);// 计算斜率low_cooksystem.slope = low_cook_calculate_slope(&low_cooksystem, time_difference);if ((low_cooksystem.slope_status == 0) && (stheat.temperature > 35)){// 判断斜率是否平缓low_cooksystem.slope_event = (fabsf(low_cooksystem.slope) < LOW_COOK_SLOPE_THRESHOLD);}
}