STM32 Real-time clock as a timer, via serial cable connected to the computer, the computer terminal prints the current time information is updated once every second.

实时时钟
........\boot
........\....\cortexm3_macro.s
........\....\stm32f10x_vector.c
........\Debug
........\.....\Exe
........\.....\...\RTC.out
........\.....\List
........\.....\Obj
........\.....\...\main.o
........\.....\...\RTC.pbd
........\.....\...\stm32f10x_adc.o
........\.....\...\stm32f10x_bkp.o
........\.....\...\stm32f10x_can.o
........\.....\...\stm32f10x_crc.o
........\.....\...\stm32f10x_dac.o
........\.....\...\stm32f10x_dbgmcu.o
........\.....\...\stm32f10x_dma.o
........\.....\...\stm32f10x_exti.o
........\.....\...\stm32f10x_flash.o
........\.....\...\stm32f10x_fsmc.o
........\.....\...\stm32f10x_gpio.o
........\.....\...\stm32f10x_i2c.o
........\.....\...\stm32f10x_it.o
........\.....\...\stm32f10x_iwdg.o
........\.....\...\stm32f10x_lib.o
........\.....\...\stm32f10x_nvic.o
........\.....\...\stm32f10x_pwr.o
........\.....\...\stm32f10x_rcc.o
........\.....\...\stm32f10x_rtc.o
........\.....\...\stm32f10x_sdio.o
........\.....\...\stm32f10x_spi.o
........\.....\...\stm32f10x_systick.o
........\.....\...\stm32f10x_tim.o
........\.....\...\stm32f10x_usart.o
........\.....\...\stm32f10x_vector.o
........\.....\...\stm32f10x_wwdg.o
........\interrupt
........\.........\stm32f10x_it.c
........\.........\stm32f10x_it.h
........\library
........\.......\inc
........\.......\...\cortexm3_macro.h
........\.......\...\stm32f10x_adc.h
........\.......\...\stm32f10x_bkp.h
........\.......\...\stm32f10x_can.h
........\.......\...\stm32f10x_crc.h
........\.......\...\stm32f10x_dac.h
........\.......\...\stm32f10x_dbgmcu.h
........\.......\...\stm32f10x_dma.h
........\.......\...\stm32f10x_exti.h
........\.......\...\stm32f10x_flash.h
........\.......\...\stm32f10x_fsmc.h
........\.......\...\stm32f10x_gpio.h
........\.......\...\stm32f10x_i2c.h
........\.......\...\stm32f10x_iwdg.h
........\.......\...\stm32f10x_lib.h
........\.......\...\stm32f10x_map.h
........\.......\...\stm32f10x_nvic.h
........\.......\...\stm32f10x_pwr.h
........\.......\...\stm32f10x_rcc.h
........\.......\...\stm32f10x_rtc.h
........\.......\...\stm32f10x_sdio.h
........\.......\...\stm32f10x_spi.h
........\.......\...\stm32f10x_systick.h
........\.......\...\stm32f10x_tim.h
........\.......\...\stm32f10x_type.h
........\.......\...\stm32f10x_usart.h
........\.......\...\stm32f10x_wwdg.h
........\.......\src
........\.......\...\stm32f10x_adc.c
........\.......\...\stm32f10x_bkp.c
........\.......\...\stm32f10x_can.c
........\.......\...\stm32f10x_crc.c
........\.......\...\stm32f10x_dac.c
........\.......\...\stm32f10x_dbgmcu.c
........\.......\...\stm32f10x_dma.c
........\.......\...\stm32f10x_exti.c
........\.......\...\stm32f10x_flash.c
........\.......\...\stm32f10x_fsmc.c
........\.......\...\stm32f10x_gpio.c
........\.......\...\stm32f10x_i2c.c
........\.......\...\stm32f10x_iwdg.c
........\.......\...\stm32f10x_lib.c
........\.......\...\stm32f10x_nvic.c
........\.......\...\stm32f10x_pwr.c
........\.......\...\stm32f10x_rcc.c
........\.......\...\stm32f10x_rtc.c
........\.......\...\stm32f10x_sdio.c
........\.......\...\stm32f10x_spi.c
........\.......\...\stm32f10x_systick.c
........\.......\...\stm32f10x_tim.c
........\.......\...\stm32f10x_usart.c
........\.......\...\stm32f10x_wwdg.c
........\RTC.dep
........\RTC.ewd
........\RTC.ewp
........\RTC.eww
........\settings
........\........\RTC.cspy.bat

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