计算斜率，判断斜率

#include 
#include 
#include 
#include 
// 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 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 tim_count = 0;
    if (system->count 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 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  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 = 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) 
                
                
                
（图片来源网络，侵删）