Stm32cubemx (8): RTC and RTC wake-up interrupt

Real time clock （RTC）：
it It's an independent BCD Timer / Counter .RTC Provide A calendar clock 、 Two programmable The alarm clock is broken , And one A periodic programmable wake-up flag with interrupt function .RTC Also included for managing low power mode Automatic wake-up unit .
Two 32 Bit registers contain binary decimal format (BCD) Seconds of 、 minute 、 Hours （12 or 24 hourly ）、 star
Period 、 date 、 Month and year . Besides , Sub second values in binary format are also available .
The system can automatically compensate the days of the month to 28、29（ Leap year ）、30 and 31 God . And you can have daylight saving time
compensate .
Other 32 The bit register also contains programmable alarm sub seconds 、 second 、 minute 、 Hours 、 What day and date of the week .
block diagram ：

According to the picture above ： Work out RTC clock frequency ：32.768kHZ/128/256=1HZ
interrupt ：

choice LSE As RTC Clock source ：

Code ：


RTC Wake up interrupt ：
There is more configuration in the following step ：

Code ：

Callback function ：