STM32实时时钟功能的标准库实现首先是bsp驱动，包括初始化函数RTC_Init()和设置时间函数RTC_Set()。

接下来就是<time.h>中的相关函数，我只实现了我认为最重要的函数

time_t time(time_t *time)

time_t mktime(struct tm *timeptr)

struct tm *gmtime(const time_t *timer)

以及辅助函数

static int getTotalDays(int year, int month, int day)

因为gmtime函数需要用到<stdlib.h>中的malloc函数，有时不希望使用该函数，所以我还实现了一个他的变体函数

UINT8 gmtime2(struct tm *time, const time_t *timer) -The standard library STM32 real time clock function to realize the first is the BSP driver, including the initialization function (RTC_Init) and set the time function RTC_Set ().

The next is the correlation function in the <time.h>, I just realized I think the most important function of the

Time_t time (time_t*time)

Time_t mktime (struct TM*timeptr)

Struct TM*gmtime (const time_t*timer)

And the auxiliary function

Static int getTotalDays (int year, int month, int day)

Because the gmtime function need to use malloc function in <stdlib.h>, sometimes do not want to use this function, so I also realized a his variant function

UINT8 gmtime2 (struct TM*time, const time_t*timer)