#define	Platform_num  5
uint8_t elevator_current = 0;
uint8_t platform[Platform_num];
uint8_t elevator_i = 0;

for(elevator_i=Platform_num-1; elevator_i>=elevator_current;elevator_i--)
	{
		if(platform[elevator_i]==1)
		{
			elevator_temp = elevator_i;//搜寻最近需求
		}
	}