STM32F103R8 the USART3 use

uart3_3.0\stm32\Libraries\CMSIS\Core\CM3\core_cm3.c
.........\.....\.........\.....\....\...\core_cm3.h
.........\.....\.........\.....\....\...\startup\arm\startup_stm32f10x_hd.s
.........\.....\.........\.....\....\...\.......\...\startup_stm32f10x_ld.s
.........\.....\.........\.....\....\...\.......\...\startup_stm32f10x_md.s
.........\.....\.........\.....\....\...\.......\gcc\startup_stm32f10x_hd.c
.........\.....\.........\.....\....\...\.......\...\startup_stm32f10x_ld.c
.........\.....\.........\.....\....\...\.......\...\startup_stm32f10x_md.c
.........\.....\.........\.....\....\...\.......\iar\startup_stm32f10x_hd.s
.........\.....\.........\.....\....\...\.......\...\startup_stm32f10x_ld.s
.........\.....\.........\.....\....\...\.......\...\startup_stm32f10x_md.s
.........\.....\.........\.....\....\...\stm32f10x.h
.........\.....\.........\.....\....\...\system_stm32f10x.c
.........\.....\.........\.....\....\...\system_stm32f10x.h
.........\.....\.........\.....\....\Documentation\CMSIS_Core.htm
.........\.....\.........\STM32F10x_StdPeriph_Driver\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.

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