External Interrupt on STM32F4Discovery Board using button user

ExternalInterrupt\.cproject
.................\.project
.................\.settings\com.atollic.truestudio.debug.hardware_device.prefs
.................\.........\org.eclipse.cdt.managedbuilder.core.prefs
.................\Debug\ExternalInterrupt.elf
.................\.....\ExternalInterrupt.map
.................\.....\Libraries\STM32F4xx_StdPeriph_Driver\src\misc.o
.................\.....\.........\..........................\...\stm32f4xx_adc.o
.................\.....\.........\..........................\...\stm32f4xx_can.o
.................\.....\.........\..........................\...\stm32f4xx_crc.o
.................\.....\.........\..........................\...\stm32f4xx_cryp.o
.................\.....\.........\..........................\...\stm32f4xx_cryp_aes.o
.................\.....\.........\..........................\...\stm32f4xx_cryp_des.o
.................\.....\.........\..........................\...\stm32f4xx_cryp_tdes.o
.................\.....\.........\..........................\...\stm32f4xx_dac.o
.................\.....\.........\..........................\...\stm32f4xx_dbgmcu.o
.................\.....\.........\..........................\...\stm32f4xx_dcmi.o
.................\.....\.........\..........................\...\stm32f4xx_dma.o
.................\.....\.........\..........................\...\stm32f4xx_exti.o
.................\.....\.........\..........................\...\stm32f4xx_flash.o
.................\.....\.........\..........................\...\stm32f4xx_fsmc.o
.................\.....\.........\..........................\...\stm32f4xx_gpio.o
.................\.....\.........\..........................\...\stm32f4xx_hash.o
.................\.....\.........\..........................\...\stm32f4xx_hash_md5.o
.................\.....\.........\..........................\...\stm32f4xx_hash_sha1.o
.................\.....\.........\..........................\...\stm32f4xx_i2c.o
.................\.....\.........\..........................\...\stm32f4xx_iwdg.o
.................\.....\.........\..........................\...\stm32f4xx_pwr.o
.................\.....\.........\..........................\...\stm32f4xx_rcc.o
.................\.....\.........\..........................\...\stm32f4xx_rng.o
.................\.....\.........\..........................\...\stm32f4xx_rtc.o
.................\.....\.........\..........................\...\stm32f4xx_sdio.o
.................\.....\.........\..........................\...\stm32f4xx_spi.o
.................\.....\.........\..........................\...\stm32f4xx_syscfg.o
.................\.....\.........\..........................\...\stm32f4xx_tim.o
.................\.....\.........\..........................\...\stm32f4xx_usart.o
.................\.....\.........\..........................\...\stm32f4xx_wwdg.o
.................\.....\src\main.o
.................\.....\...\startup_stm32f4xx.o
.................\.....\...\stm32f4xx_it.o
.................\.....\...\system_stm32f4xx.o
.................\.....\Utilities\STM32_EVAL\stm32f4_discovery.o
.................\.....\.........\..........\stm32f4_discovery_audio_codec.o
.................\.....\.........\..........\stm32f4_discovery_lis302dl.o
.................\ExternalInterrupt.elf.launch
.................\Libraries\CMSIS\CMSIS END USER LICENCE AGREEMENT.pdf
.................\.........\.....\Include\core_cm4.h
.................\.........\.....\.......\core_cm4_simd.h
.................\.........\.....\.......\core_cmFunc.h
.................\.........\.....\.......\core_cmInstr.h
.................\.........\Device\STM32F4xx\Include\stm32f4xx.h
.................\.........\......\.........\.......\system_stm32f4xx.h
.................\.........\......\.........\Release_Notes.html
.................\.........\STM32F4xx_StdPeriph_Driver\inc\misc.h
.................\.........\..........................\...\stm32f4xx_adc.h
.................\.........\..........................\...\stm32f4xx_can.h
.................\.........\..........................\...\stm32f4xx_crc.h
.................\.......

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