stm32f303如何生成时间戳？

Question

我正在编写代码来生成时间戳，以将其用作执行特定功能的参考。谁能帮我怎么做。我是嵌入式编程新手。

Answer 1

首先，您必须初始化 RTC。希望你知道，如何做这个STM32CubeMX。

然后就是简单的代码：

#include <time.h>

/* Global Vars */
RTC_TimeTypeDef currentTime;
RTC_DateTypeDef currentDate;
time_t timestamp;
struct tm currTime;


/* Code to get timestamp 
*
*  You must call HAL_RTC_GetDate() after HAL_RTC_GetTime() to unlock the values 
*  in the higher-order calendar shadow registers to ensure consistency between the time and date values.
*  Reading RTC current time locks the values in calendar shadow registers until Current date is read
*  to ensure consistency between the time and date values.
*/

HAL_RTC_GetTime(&hrtc, &currentTime, RTC_FORMAT_BIN);
HAL_RTC_GetDate(&hrtc, &currentDate, RTC_FORMAT_BIN);

currTime.tm_year = currentDate.Year + 100;  // In fact: 2000 + 18 - 1900
currTime.tm_mday = currentDate.Date;
currTime.tm_mon  = currentDate.Month - 1;

currTime.tm_hour = currentTime.Hours;
currTime.tm_min  = currentTime.Minutes;
currTime.tm_sec  = currentTime.Seconds;

timestamp = mktime(&currTime);

PS我不检查日期和时间数据是否正确。如果你想 - 自己检查一下数据是否正确。