2, the microcontroller system clock is set to 56M, with UART1, printf () to 19200 baud rate, the first question to achieve the clock function, upload to the PC side.

浣滀笟浜?
浣滀笟浜?JLinkLog.txt
浣滀笟浜?JLinkSettings.ini
浣滀笟浜?Listings
.................\startup_stm32f10x_md.lst
.................\usart1.map
浣滀笟浜?Objects
................\ExtDll.iex
................\func.crf
................\func.d
................\func.o
................\gpio_stm32f10x.crf
................\gpio_stm32f10x.d
................\gpio_stm32f10x.o
................\main.crf
................\main.d
................\main.o
................\misc.crf
................\misc.d
................\misc.o
................\startup_stm32f10x_md.d
................\startup_stm32f10x_md.o
................\stm32f10x_gpio.crf
................\stm32f10x_gpio.d
................\stm32f10x_gpio.o
................\stm32f10x_rcc.crf
................\stm32f10x_rcc.d
................\stm32f10x_rcc.o
................\stm32f10x_tim.crf
................\stm32f10x_tim.d
................\stm32f10x_tim.o
................\stm32f10x_usart.crf
................\stm32f10x_usart.d
................\stm32f10x_usart.o
................\system_stm32f10x.crf
................\system_stm32f10x.d
................\system_stm32f10x.o
................\uart_stm32f10x.d
................\usart.crf
................\usart.d
................\usart1.axf
................\usart1.build_log.htm
................\usart1.htm
................\usart1.lnp
................\usart1.sct
................\usart1_Target 1.dep
浣滀笟浜?RTE
............\Device
............\......\STM32F103RB
............\......\...........\RTE_Device.h
............\......\...........\RTE_Device.h.0000
............\......\...........\RTE_Device.h.0001
............\......\...........\RTE_Device.h.0002
............\......\...........\startup_stm32f10x_md.s
............\......\...........\startup_stm32f10x_md.s.0000
............\......\...........\startup_stm32f10x_md.s.0001
............\......\...........\startup_stm32f10x_md.s.0002
............\......\...........\stm32f10x_conf.h
............\......\...........\stm32f10x_conf.h.0000
............\......\...........\stm32f10x_conf.h.0001
............\......\...........\stm32f10x_conf.h.0002
............\......\...........\system_stm32f10x.c
............\......\...........\system_stm32f10x.c.0000
............\......\...........\system_stm32f10x.c.0001
............\......\...........\system_stm32f10x.c.0002
............\RTE_Components.h
浣滀笟浜?Source
...............\func.c
...............\main.c
...............\main.h
浣滀笟浜?usart1.build_log.htm
浣滀笟浜?usart1.uvguix.dkj
浣滀笟浜?usart1.uvguix.lenovo
浣滀笟浜?usart1.uvoptx
浣滀笟浜?usart1.uvprojx

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