This a stm32 the routines, the serial instance of printf.

串口printf实验
..............\Debug
..............\.....\Exe
..............\.....\...\串口实验.out
..............\.....\List
..............\.....\Obj
..............\.....\...\core_cm3.o
..............\.....\...\misc.o
..............\.....\...\stm32f10x_adc.o
..............\.....\...\stm32f10x_bkp.o
..............\.....\...\stm32f10x_can.o
..............\.....\...\stm32f10x_cec.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_pwr.o
..............\.....\...\stm32f10x_rcc.o
..............\.....\...\stm32f10x_rtc.o
..............\.....\...\stm32f10x_sdio.o
..............\.....\...\stm32f10x_spi.o
..............\.....\...\stm32f10x_tim.o
..............\.....\...\stm32f10x_usart.o
..............\.....\...\stm32f10x_wwdg.o
..............\.....\...\stm32_eval.o
..............\.....\...\system_stm32f10x.o
..............\.....\...\test.o
..............\.....\...\串口实验.pbd
..............\Libraries
..............\.........\CMSIS
..............\.........\.....\CM3
..............\.........\.....\...\CoreSupport
..............\.........\.....\...\...........\core_cm3.c
..............\.........\.....\...\...........\core_cm3.h
..............\.........\.....\...\DeviceSupport
..............\.........\.....\...\.............\ST
..............\.........\.....\...\.............\..\STM32F10x
..............\.........\.....\...\.............\..\.........\Release_Notes.html
..............\.........\.....\...\.............\..\.........\startup
..............\.........\.....\...\.............\..\.........\.......\arm
..............\.........\.....\...\.............\..\.........\.......\...\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
..............\.........\.....\...\.............\..\.........\.......\gcc_ride7
..............\.........\.....\...\.............\..\.........\.......\.........\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
..............\.........\.....\...\.............\..\.........\.......\iar
..............\.........\.....\...\.............\..\.........\.......\...\startup_stm32f10x_cl.s
..............\.........\.....\...\.............\..\.........\.......\...\startup_stm32f10x_hd.s
..............\.........\.....\...\.............\..\.........\.......\...\startup_stm32f10x_hd_vl.s
..............\.........\.....\...\.............\..\.........\.

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