#include "guangshi.h"
uint8_t bizohi=0;
#define AC_SAMPLE_TIME 100    // 采样时间窗口
#define AC_CHANGE_THRESHOLD 5 // 最小变化次数阈值

static uint8_t last_ac_status = 0;
static uint8_t change_count = 0;
static uint32_t sample_timer = 0;

void Check_Power_Source(void)
{
    uint8_t current_ac = Read_MainPower();
    
    // 检测电平变化
    if(current_ac != last_ac_status)
    {
        change_count++;
        last_ac_status = current_ac;
    }
    
    sample_timer++;
    
    // 采样时间窗口到达后判断
    if(sample_timer >= AC_SAMPLE_TIME)
    {
        // 如果在采样窗口内检测到足够的变化次数，说明交流电存在
        if(change_count >= AC_CHANGE_THRESHOLD)
        {
            bizohi = 1;  // 市电正常
        }
        else
        {
            bizohi = 2;  // 市电断开
        }
        
        // 重置计数器
        change_count = 0;
        sample_timer = 0;
    }
}