STM32 USART operation from scratch, such as explaining, careful in-depth, and I hope to help beginners

01_LEDUSART
...........\board
...........\.....\inc
...........\.....\...\delay.h
...........\.....\...\key.h
...........\.....\...\led.h
...........\.....\...\usart.h
...........\.....\src
...........\.....\...\delay.c
...........\.....\...\key.c
...........\.....\...\led.c
...........\.....\...\usart.c
...........\inc
...........\...\main.h
...........\...\misc.h
...........\...\stm32f4xx_adc.h
...........\...\stm32f4xx_can.h
...........\...\stm32f4xx_conf.h
...........\...\stm32f4xx_crc.h
...........\...\stm32f4xx_cryp.h
...........\...\stm32f4xx_dac.h
...........\...\stm32f4xx_dbgmcu.h
...........\...\stm32f4xx_dcmi.h
...........\...\stm32f4xx_dma.h
...........\...\stm32f4xx_exti.h
...........\...\stm32f4xx_flash.h
...........\...\stm32f4xx_fsmc.h
...........\...\stm32f4xx_gpio.h
...........\...\stm32f4xx_hash.h
...........\...\stm32f4xx_i2c.h
...........\...\stm32f4xx_it.h
...........\...\stm32f4xx_iwdg.h
...........\...\stm32f4xx_pwr.h
...........\...\stm32f4xx_rcc.h
...........\...\stm32f4xx_rng.h
...........\...\stm32f4xx_rtc.h
...........\...\stm32f4xx_sdio.h
...........\...\stm32f4xx_spi.h
...........\...\stm32f4xx_syscfg.h
...........\...\stm32f4xx_tim.h
...........\...\stm32f4xx_usart.h
...........\...\stm32f4xx_wwdg.h
...........\proj
...........\....\JLinkLog.txt
...........\....\JLinkSettings.ini
...........\....\output
...........\....\......\delay.crf
...........\....\......\delay.d
...........\....\......\delay.o
...........\....\......\ExtDll.iex
...........\....\......\key.crf
...........\....\......\key.d
...........\....\......\key.o
...........\....\......\led.crf
...........\....\......\led.d
...........\....\......\led.o
...........\....\......\main.crf
...........\....\......\main.d
...........\....\......\main.o
...........\....\......\misc.crf
...........\....\......\misc.d
...........\....\......\misc.o
...........\....\......\startup_stm32f4xx.d
...........\....\......\startup_stm32f4xx.lst
...........\....\......\startup_stm32f4xx.o
...........\....\......\stm32f4xx_gpio.crf
...........\....\......\stm32f4xx_gpio.d
...........\....\......\stm32f4xx_gpio.o
...........\....\......\stm32f4xx_it.crf
...........\....\......\stm32f4xx_it.d
...........\....\......\stm32f4xx_it.o
...........\....\......\stm32f4xx_rcc.crf
...........\....\......\stm32f4xx_rcc.d
...........\....\......\stm32f4xx_rcc.o
...........\....\......\stm32f4xx_tim.crf
...........\....\......\stm32f4xx_tim.d
...........\....\......\stm32f4xx_tim.o
...........\....\......\stm32f4xx_usart.crf
...........\....\......\stm32f4xx_usart.d
...........\....\......\stm32f4xx_usart.o
...........\....\......\system_stm32f4xx.crf
...........\....\......\system_stm32f4xx.d
...........\....\......\system_stm32f4xx.o
...........\....\......\test.axf
...........\....\......\test.hex
...........\....\......\test.htm
...........\....\......\test.lnp
...........\....\......\test.map
...........\....\......\test.plg
...........\....\......\test.sct
...........\....\......\test.tra
...........\....\......\usart.crf
...........\....\......\usart.d
...........\....\......\usart.o
...........\....\startup_stm32f4xx.s
...........\....\test.plg
...........\....\test.uvgui.Administrator
...........\....\test.uvgui_Administrator.bak
...........\....\test.uvopt
...........\....\test.uvproj

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