Use STM32F407 Discovery Board，set GPIO and system clock etc. corecctly.

IO_Toggle\EWARM\IO_Toggle.ewd
.........\.....\IO_Toggle.ewp
.........\.....\IO_Toggle.eww
.........\.....\stm32f4xx_flash.icf
.........\.....\.ettings\IO_Toggle.cspy.bat
.........\.....\........\IO_Toggle.wsdt
.........\.....\........\IO_Toggle.dbgdt
.........\.....\........\IO_Toggle.dni
.........\.....\IO_Toggle\Obj\IO_Toggle.pbd
.........\.....\IO_Toggle.dep
.........\main.c
.........\MDK-ARM\IO_Toggle.uvopt
.........\.......\IO_Toggle.uvproj
.........\readme.txt
.........\stm32f4xx_conf.h
.........\stm32f4xx_it.c
.........\stm32f4xx_it.h
.........\system_stm32f4xx.c
.........\TASKING\IO_Toggle\.cproject
.........\.......\.........\.project
.........\.......\.........\IO_Toggle.launch
.........\.......\.........\TASKING\stm32f4xx.lsl
.........\.rueSTUDIO\IO_Toggle\.cproject
.........\..........\.........\.project
.........\..........\.........\.settings\com.atollic.truestudio.debug.hardware_device.prefs
.........\..........\.........\IO_Toggle.elf.launch
.........\..........\.........\stm32_flash.ld
.........\EWARM\IO_Toggle\Exe
.........\.....\.........\Obj
.........\.....\.........\List
.........\TASKING\.metadata\Link
.........\.......\IO_Toggle\TASKING
.........\.rueSTUDIO\.metadata\Link
.........\..........\IO_Toggle\.settings
.........\EWARM\settings
.........\.....\IO_Toggle
.........\TASKING\.metadata
.........\.......\IO_Toggle
.........\.rueSTUDIO\.metadata
.........\..........\IO_Toggle
.........\EWARM
.........\MDK-ARM
.........\TASKING
.........\TrueSTUDIO
IO_Toggle

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