由杨晓胜原创，转载请注明出处， stm32利用滴答中断的只能延时函数，可以再用户规定时间延时时间内，cpu不空转，进入睡眠状态，而睡眠结束后，cpu自动醒来，工作，从而大大节省了功耗。-YangXiaoSheng by the original, reproduced please indicate the source. Stm32 use ticking interrupt only delay function, can again users set time delay tim