In the embedded serial programming for stm32, I struggle with the board and PC can communicate

USART2串口通信程序（查询模式）\App\main.c
..............................\CPU_LIB\cortexm3_macro.h
..............................\.......\stm32f10x_adc.c
..............................\.......\stm32f10x_adc.h
..............................\.......\stm32f10x_bkp.c
..............................\.......\stm32f10x_bkp.h
..............................\.......\stm32f10x_can.c
..............................\.......\stm32f10x_can.h
..............................\.......\stm32f10x_conf.h
..............................\.......\stm32f10x_dma.c
..............................\.......\stm32f10x_dma.h
..............................\.......\stm32f10x_exti.c
..............................\.......\stm32f10x_exti.h
..............................\.......\stm32f10x_flash.c
..............................\.......\stm32f10x_flash.h
..............................\.......\stm32f10x_gpio.c
..............................\.......\stm32f10x_gpio.h
..............................\.......\stm32f10x_i2c.c
..............................\.......\stm32f10x_i2c.h
..............................\.......\stm32f10x_iwdg.c
..............................\.......\stm32f10x_iwdg.h
..............................\.......\stm32f10x_lib.c
..............................\.......\stm32f10x_lib.h
..............................\.......\stm32f10x_map.h
..............................\.......\stm32f10x_nvic.c
..............................\.......\stm32f10x_nvic.h
..............................\.......\stm32f10x_pwr.c
..............................\.......\stm32f10x_pwr.h
..............................\.......\stm32f10x_rcc.c
..............................\.......\stm32f10x_rcc.h
..............................\.......\stm32f10x_rtc.c
..............................\.......\stm32f10x_rtc.h
..............................\.......\stm32f10x_spi.c
..............................\.......\stm32f10x_spi.h
..............................\.......\stm32f10x_systick.c
..............................\.......\stm32f10x_systick.h
..............................\.......\stm32f10x_tim.c
..............................\.......\stm32f10x_tim.h
..............................\.......\stm32f10x_tim1.c
..............................\.......\stm32f10x_tim1.h
..............................\.......\stm32f10x_type.h
..............................\.......\stm32f10x_usart.c
..............................\.......\stm32f10x_usart.h
..............................\.......\stm32f10x_wwdg.c
..............................\.......\stm32f10x_wwdg.h
..............................\.......\STM32_Init.c
..............................\.......\STM32_Init.h
..............................\.......\STM32_Reg.h
..............................\List\cortexm3_macro.lst
..............................\....\object.map
..............................\....\STM32F10x.lst
..............................\Object.Opt
..............................\Object.Uv2
..............................\Object_Opt.Bak
..............................\Object_Uv2.Bak
..............................\Object_工程.dep
..............................\output\cortexm3_macro.o
..............................\......\main.crf
..............................\......\main.d
..............................\......\main.o
..............................\......\main.__i
..............................\......\object.axf
..............................\......\object.hex
..............................\......\object.htm
..............................\......\object.lnp
..............................\......\object.plg
..............................\......\object.sct
..............................\......\object.tra
..............................\......\STM32F10x.o
..............................\......\stm32f10x_gpio.crf
..............................\......\stm32f10x_gpio.d
..............................\......\stm32f10x_gpio.o
..............................\......\stm32f10x_rcc.crf
..............................\......\stm32f10x_rcc.d
..............................\......\stm32f10x_rcc.o
..............................\......\stm32f10x_usart.crf
..............................\......\stm32f10x_

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