STM32F103 UART configuration, implement the C language printf function

printf（polling）\Doc\readme.txt
printf（polling）\keilkill.bat
printf（polling）\Libraries\CMSIS\core_cm3.c
printf（polling）\Libraries\CMSIS\core_cm3.h
printf（polling）\Libraries\CMSIS\startup\startup_stm32f10x_cl.s
printf（polling）\Libraries\CMSIS\startup\startup_stm32f10x_hd.s
printf（polling）\Libraries\CMSIS\startup\startup_stm32f10x_hd_vl.s
printf（polling）\Libraries\CMSIS\startup\startup_stm32f10x_ld.s
printf（polling）\Libraries\CMSIS\startup\startup_stm32f10x_ld_vl.s
printf（polling）\Libraries\CMSIS\startup\startup_stm32f10x_md.s
printf（polling）\Libraries\CMSIS\startup\startup_stm32f10x_md_vl.s
printf（polling）\Libraries\CMSIS\startup\startup_stm32f10x_xl.s
printf（polling）\Libraries\CMSIS\stm32f10x.h
printf（polling）\Libraries\CMSIS\system_stm32f10x.c
printf（polling）\Libraries\CMSIS\system_stm32f10x.h
printf（polling）\Libraries\FWlib\inc\misc.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_adc.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_bkp.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_can.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_cec.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_crc.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_dac.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_dbgmcu.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_dma.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_exti.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_flash.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_fsmc.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_gpio.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_i2c.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_iwdg.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_pwr.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_rcc.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_rtc.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_sdio.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_spi.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_tim.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_usart.h
printf（polling）\Libraries\FWlib\inc\stm32f10x_wwdg.h
printf（polling）\Libraries\FWlib\src\misc.c
printf（polling）\Libraries\FWlib\src\stm32f10x_adc.c
printf（polling）\Libraries\FWlib\src\stm32f10x_bkp.c
printf（polling）\Libraries\FWlib\src\stm32f10x_can.c
printf（polling）\Libraries\FWlib\src\stm32f10x_cec.c
printf（polling）\Libraries\FWlib\src\stm32f10x_crc.c
printf（polling）\Libraries\FWlib\src\stm32f10x_dac.c
printf（polling）\Libraries\FWlib\src\stm32f10x_dbgmcu.c
printf（polling）\Libraries\FWlib\src\stm32f10x_dma.c
printf（polling）\Libraries\FWlib\src\stm32f10x_exti.c
printf（polling）\Libraries\FWlib\src\stm32f10x_flash.c
printf（polling）\Libraries\FWlib\src\stm32f10x_fsmc.c
printf（polling）\Libraries\FWlib\src\stm32f10x_gpio.c
printf（polling）\Libraries\FWlib\src\stm32f10x_i2c.c
printf（polling）\Libraries\FWlib\src\stm32f10x_iwdg.c
printf（polling）\Libraries\FWlib\src\stm32f10x_pwr.c
printf（polling）\Libraries\FWlib\src\stm32f10x_rcc.c
printf（polling）\Libraries\FWlib\src\stm32f10x_rtc.c
printf（polling）\Libraries\FWlib\src\stm32f10x_sdio.c
printf（polling）\Libraries\FWlib\src\stm32f10x_spi.c
printf（polling）\Libraries\FWlib\src\stm32f10x_tim.c
printf（polling）\Libraries\FWlib\src\stm32f10x_usart.c
printf（polling）\Libraries\FWlib\src\stm32f10x_wwdg.c
printf（polling）\Output\Template.hex
printf（polling）\Project\RVMDK（uv4）\iSO-STM32.uvgui.Administrator
printf（polling）\Project\RVMDK（uv4）\iSO-STM32.uvgui.fire
printf（polling）\Project\RVMDK（uv4）\iSO-STM32.uvguix.Administrator
printf（polling）\Project\RVMDK（uv4）\iSO-STM32.uvguix.zengcai huang
printf（polling）\Project\RVMDK（uv4）\iSO-STM32.uvopt
printf（polling）\Project\RVMDK（uv4）\iSO-STM32.uvoptx
printf（polling）\Project\RVMDK（uv4）\iSO-STM32.uvproj.saved_uv4
printf（polling）\Project\RVMDK（uv4）\iSO-STM32.uvprojx
printf（polling）\Project\RVMDK（uv4）\JLinkSettings.ini
printf（polling）\Project\RVMDK（uv4）\RTE\RTE_Components.h
printf（polling）\User\main.c
printf（polling）\User\stm32f10x_conf.h
printf（polling）\User\stm32f10x_it.c
printf（polling）\User\stm32f10x_it.h
printf（polling）\User\usart\bsp_usart1.c
printf（polling）\User\usart\bsp_usart1.h
printf（polling）\Libraries\CMSIS\startup
printf（polling）\Libraries\FWlib\inc
printf（polling）\Libraries\FWlib\src
printf（polling）\Project\RVMDK（uv4）\RTE
printf（polling）\Libraries\CMSIS
printf（polling）\Libraries\FWlib
printf（polling）\Project\RVMDK（uv4）
printf（polling）\User\usart
printf（polling）\Doc
printf（polling）\Libraries
printf（polling）\Listing
printf（polling）\Output
printf（polling）\Project
printf（polling）\User
printf（polling）

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