This example shows how to configure external interrupt lines. In this example, the EXTI Line0 (connected to PA0 pin) is configured to generate an interrupt on each rising edge. In the interrupt routine a led connected to PD.12 pin is toggled.

EXTI
....\.DS_Store
__MACOSX
........\EXTI
........\....\._.DS_Store
EXTI\EWARM
....\.....\Exti.ewd
....\.....\Exti.ewp
....\.....\Exti.eww
....\.....\stm32f4xx_flash.icf
....\main.c
....\main.h
....\MDK-ARM
....\.......\Exti
....\.......\....\ExtDll.iex
....\.......\....\Exti.axf
....\.......\....\Exti.htm
....\.......\....\Exti.lnp
....\.......\....\Exti.map
....\.......\....\Exti.plg
....\.......\....\Exti.sct
....\.......\....\main.crf
....\.......\....\main.d
....\.......\....\main.o
....\.......\....\misc.crf
....\.......\....\misc.d
....\.......\....\misc.o
....\.......\....\startup_stm32f4xx.d
....\.......\....\startup_stm32f4xx.lst
....\.......\....\startup_stm32f4xx.o
....\.......\....\stm32f4_discovery.crf
....\.......\....\stm32f4_discovery.d
....\.......\....\stm32f4_discovery.o
....\.......\....\stm32f4xx_adc.crf
....\.......\....\stm32f4xx_adc.d
....\.......\....\stm32f4xx_adc.o
....\.......\....\stm32f4xx_dma.crf
....\.......\....\stm32f4xx_dma.d
....\.......\....\stm32f4xx_dma.o
....\.......\....\stm32f4xx_exti.crf
....\.......\....\stm32f4xx_exti.d
....\.......\....\stm32f4xx_exti.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_syscfg.crf
....\.......\....\stm32f4xx_syscfg.d
....\.......\....\stm32f4xx_syscfg.o
....\.......\....\system_stm32f4xx.crf
....\.......\....\system_stm32f4xx.d
....\.......\....\system_stm32f4xx.o
....\.......\Exti.uvgui.Joe
....\.......\Exti.uvgui.jrwebe3
....\.......\Exti.uvgui_Joe.bak
....\.......\Exti.uvgui_jrwebe3.bak
....\.......\Exti.uvopt
....\.......\Exti.uvproj
....\.......\Exti_Exti.dep
....\.......\main.h
....\readme.txt
....\stm32f4xx_conf.h
....\stm32f4xx_it.c
....\stm32f4xx_it.h
....\system_stm32f4xx.c
....\TASKING
....\.......\.metadata
....\.......\.........\Link
....\.......\EXTI
....\.......\....\.cproject
....\.......\....\.project
....\.......\....\EXTI.launch
....\.......\....\TASKING
....\.......\....\.......\stm32f4xx.lsl
....\TrueSTUDIO
....\..........\.metadata
....\..........\.........\Link
....\..........\EXTI
....\..........\....\.cproject
....\..........\....\.project
....\..........\....\.settings
....\..........\....\.........\com.atollic.truestudio.debug.hardware_device.prefs
....\..........\....\EXTI.elf.launch
....\..........\....\stm32_flash.ld

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