To help understanding stm32 environment stm32-based serial code

3-串口1\USART1（printf+USER_printf）\CMSIS\core_cm3.c
.......\............................\.....\core_cm3.h
.......\............................\.....\startup\startup_stm32f10x_hd.s
.......\............................\.....\.......\startup_stm32f10x_ld.s
.......\............................\.....\.......\startup_stm32f10x_md.s
.......\............................\.....\stm32f10x.h
.......\............................\.....\system_stm32f10x.c
.......\............................\.....\system_stm32f10x.h
.......\............................\FWlib\inc\misc.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_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_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\startup_stm32f10x_hd.lst
.......\............................\.......\STM32-DEMO.map
.......\............................\Output\core_cm3.crf
.......\............................\......\core_cm3.d
.......\............................\......\core_cm3.o
.......\............................\......\core_cm3.__i
.......\............................\......\led.crf
.......\............................\......\led.d
.......\............................\......\led.o
.......\............................\......\main.crf
.......\............................\......\main.d
.......\............................\......\main.o
.......\............................\......\main.__i
.......\............................\......\startup_stm32f10x_hd.o
.......\..............

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