The stm32 drive the RTC clock, and within the current clock via a serial port to send data into the computer

stm32_usart1_rtc_timing\Core\core_cm3.c
.......................\....\core_cm3.h
.......................\....\startup\startup_stm32f10x_cl.s
.......................\....\.......\startup_stm32f10x_hd.s
.......................\....\.......\startup_stm32f10x_hd_vl.s
.......................\....\.......\startup_stm32f10x_ld.s
.......................\....\.......\startup_stm32f10x_ld_vl.s
.......................\....\.......\startup_stm32f10x_md.s
.......................\....\.......\startup_stm32f10x_md_vl.s
.......................\....\.......\startup_stm32f10x_xl.s
.......................\....\stm32f10x.h
.......................\....\system_stm32f10x.c
.......................\....\system_stm32f10x.h
.......................\Flib\inc\misc.h
.......................\....\...\stm32f10x_adc.h
.......................\....\...\stm32f10x_bkp.h
.......................\....\...\stm32f10x_can.h
.......................\....\...\stm32f10x_cec.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_pwr.h
.......................\....\...\stm32f10x_rcc.h
.......................\....\...\stm32f10x_rtc.h
.......................\....\...\stm32f10x_sdio.h
.......................\....\...\stm32f10x_spi.h
.......................\....\...\stm32f10x_tim.h
.......................\....\...\stm32f10x_usart.h
.......................\....\...\stm32f10x_wwdg.h
.......................\....\src\misc.c
.......................\....\...\stm32f10x_adc.c
.......................\....\...\stm32f10x_bkp.c
.......................\....\...\stm32f10x_can.c
.......................\....\...\stm32f10x_cec.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_pwr.c
.......................\....\...\stm32f10x_rcc.c
.......................\....\...\stm32f10x_rtc.c
.......................\....\...\stm32f10x_sdio.c
.......................\....\...\stm32f10x_spi.c
.......................\....\...\stm32f10x_tim.c
.......................\....\...\stm32f10x_usart.c
.......................\....\...\stm32f10x_wwdg.c
.......................\Listing\Demo.map
.......................\.......\startup_stm32f10x_md.lst
.......................\Output\core_cm3.crf
.......................\......\core_cm3.d
.......................\......\core_cm3.o
.......................\......\Demo.axf
.......................\......\Demo.build_log.htm
.......................\......\Demo.fed
.......................\......\Demo.htm
.......................\......\Demo.l1p
.......................\......\Demo.l2p
.......................\......\Demo.lnp
.......................\......\Demo.sct
.......................\......\Demo.tra
.......................\......\Demo_Demo.dep
.......................\......\ExtDll.iex
.......................\......\main.crf
.......................\......\main.d
.......................\......\main.o
.......................\......\misc.crf
.......................\......\misc.d
.......................\......\misc.o
.......................\......\startup_stm32f10x_md.d
.......................\......\startup_stm32f10x_md.o
.......................\......\stm32f10x_adc.crf
.......................\......\stm32f10x_adc.d
.....

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