this is an example of working LED_GPIO in stm32f407 discovery dev board

STM32f407_GPIO\CMSIS\Device\ST\STM32F4xx\Include\stm32f4xx.h
..............\.....\......\..\.........\.......\system_stm32f4xx.h
..............\.....\......\..\.........\Release_Notes.html
..............\.....\......\..\.........\Source\Templates\arm\startup_stm32f401xx.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f40xx.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f40_41xxx.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f411xe.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f427x.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f427_437xx.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f429_439xx.s
..............\.....\......\..\.........\......\.........\gcc_ride7\startup_stm32f401xx.s
..............\.....\......\..\.........\......\.........\.........\startup_stm32f40xx.s
..............\.....\......\..\.........\......\.........\.........\startup_stm32f40_41xxx.s
..............\.....\......\..\.........\......\.........\.........\startup_stm32f427x.s
..............\.....\......\..\.........\......\.........\.........\startup_stm32f427_437xx.s
..............\.....\......\..\.........\......\.........\.........\startup_stm32f429_439xx.s
..............\.....\......\..\.........\......\.........\iar\startup_stm32f401xx.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f40xx.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f40_41xxx.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f411xe.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f427x.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f427_437xx.s
..............\.....\......\..\.........\......\.........\...\startup_stm32f429_439xx.s
..............\.....\......\..\.........\......\.........\system_stm32f4xx.c
..............\.....\......\..\.........\......\.........\TASKING\cstart_thumb2.asm
..............\.....\......\..\.........\......\.........\.rueSTUDIO\startup_stm32f401xx.s
..............\.....\......\..\.........\......\.........\..........\startup_stm32f40xx.s
..............\.....\......\..\.........\......\.........\..........\startup_stm32f40_41xxx.s
..............\.....\......\..\.........\......\.........\..........\startup_stm32f411xe.s
..............\.....\......\..\.........\......\.........\..........\startup_stm32f427xx.s
..............\.....\......\..\.........\......\.........\..........\startup_stm32f427_437xx.s
..............\.....\......\..\.........\......\.........\..........\startup_stm32f429_439xx.s
..............\.....\Include\arm_common_tables.h
..............\.....\.......\arm_const_structs.h
..............\.....\.......\arm_math.h
..............\.....\.......\core_cm0.h
..............\.....\.......\core_cm0plus.h
..............\.....\.......\core_cm3.h
..............\.....\.......\core_cm4.h
..............\.....\.......\core_cm4_simd.h
..............\.....\.......\core_cmFunc.h
..............\.....\.......\core_cmInstr.h
..............\.....\.......\core_sc000.h
..............\.....\.......\core_sc300.h
..............\Delay_.h
..............\IO.axf
..............\IO.build_log.htm
..............\IO.c
..............\io.crf
..............\io.d
..............\IO.h
..............\IO.hex
..............\IO.htm
..............\IO.lnp
..............\IO.map
..............\io.o
..............\IO.sct
..............\IO.uvgui.ali
..............\IO.uvgui_ali.bak
..............\IO.uvopt
..............\IO.uvproj
..............\IO_Target 1.dep
..............\IO_uvopt.bak
..............\IO_uvproj.bak
..............\main.c
..............\main.crf
..............\main.d
..............\main.o
..............\misc.crf
..............\misc.d
..............\misc.o
..............\RCC_init.h
..............\startup_stm32f40xx.d
..............\startup_stm32f40xx.lst
..............\startup_stm32f40xx.o
..............\startup_stm32f40xx.s
..............\st

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