Description: This software uses STM32f407 chip internal DMA operation RS232, I have tested in the STM32f407 development board. In order to STM32f development, very useful software
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RS232DMA
........\Libraries
........\.........\CMSIS
........\.........\.....\CMSIS END USER LICENCE AGREEMENT.pdf
........\.........\.....\Device
........\.........\.....\......\ST
........\.........\.....\......\..\STM32F0xx
........\.........\.....\......\..\.........\Include
........\.........\.....\......\..\.........\.......\stm32f0xx.h
........\.........\.....\......\..\.........\.......\system_stm32f0xx.h
........\.........\.....\......\..\.........\Release_Notes.html
........\.........\.....\......\..\.........\Source
........\.........\.....\......\..\.........\......\Templates
........\.........\.....\......\..\.........\......\.........\TASKING
........\.........\.....\......\..\.........\......\.........\TrueSTUDIO
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f030x6.s
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f030x8.s
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f0xx.s
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f0xx_ld.s
........\.........\.....\......\..\.........\......\.........\arm
........\.........\.....\......\..\.........\......\.........\...\startup_stm32f030x6.s
........\.........\.....\......\..\.........\......\.........\...\startup_stm32f030x8.s
........\.........\.....\......\..\.........\......\.........\...\startup_stm32f0xx.s
........\.........\.....\......\..\.........\......\.........\...\startup_stm32f0xx_ld.s
........\.........\.....\......\..\.........\......\.........\gcc_ride7
........\.........\.....\......\..\.........\......\.........\.........\startup_stm32f0xx.s
........\.........\.....\......\..\.........\......\.........\.........\startup_stm32f0xx_ld.s
........\.........\.....\......\..\.........\......\.........\.........\vssver.scc
........\.........\.....\......\..\.........\......\.........\iar
........\.........\.....\......\..\.........\......\.........\...\startup_stm32f030x6.s
........\.........\.....\......\..\.........\......\.........\...\startup_stm32f030x8.s
........\.........\.....\......\..\.........\......\.........\...\startup_stm32f0xx.s
........\.........\.....\......\..\.........\......\.........\...\startup_stm32f0xx_ld.s
........\.........\.....\......\..\.........\......\.........\system_stm32f0xx.c
........\.........\.....\......\..\STM32F10x
........\.........\.....\......\..\.........\Include
........\.........\.....\......\..\.........\.......\stm32f10x.h
........\.........\.....\......\..\.........\.......\system_stm32f10x.h
........\.........\.....\......\..\.........\Release_Notes.html
........\.........\.....\......\..\.........\Source
........\.........\.....\......\..\.........\......\Templates
........\.........\.....\......\..\.........\......\.........\TASKING
........\.........\.....\......\..\.........\......\.........\.......\cstart_thumb2.asm
........\.........\.....\......\..\.........\......\.........\TrueSTUDIO
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f10x_cl.s
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f10x_hd.s
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f10x_hd_vl.s
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f10x_ld.s
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f10x_ld_vl.s
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f10x_md.s
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f10x_md_vl.s
........\.........\.....\......\..\.........\......\.........\..........\startup_stm32f10x_xl.s
........\.........\.....\......\..\.........\......\.........\arm
........\.........\.....\......\..\.........\......\.........\...\startup_stm32f10x_cl.s
........\.........\.....\......\..\.........\......\.........\...\startup_stm32f10x_hd.s
........\.........\.....\......\..\.........\......\.