In this study, the use of external interrupts, achieve a similar effect with Experiment 3, namely: The development board contained four buttons (KEY_UP, KEY0, KEY1 and KEY2), to control two LED board (DS0 and DS1) and buzzer, which WK_UP control the buzzer, press the call, press the stop KEY2 control DS0, press on, press off KEY1 control DS1, the same effect as KEY2 KEY0 the simultaneous control of DS0 and DS1, press once, their status will flip once.

实验5 外部中断实验\HARDWARE\BEEP\beep.c
..................\........\....\beep.h
..................\........\EXTI\exti.c
..................\........\....\exti.h
..................\........\KEY\key.c
..................\........\...\key.h
..................\........\LED\led.c
..................\........\...\led.h
..................\keilkill.bat
..................\OBJ\TEST.hex
..................\readme.txt
..................\SYSTEM\delay\delay.c
..................\......\.....\delay.h
..................\......\readme.txt
..................\......\sys\core_cm4.h
..................\......\...\core_cm4_simd.h
..................\......\...\core_cmFunc.h
..................\......\...\core_cmInstr.h
..................\......\...\stm32f4xx.h
..................\......\...\sys.c
..................\......\...\sys.h
..................\......\...\system_stm32f4xx.h
..................\......\usart\usart.c
..................\......\.....\usart.h
..................\USER\JLinkSettings.ini
..................\....\startup_stm32f40_41xxx.s
..................\....\test.c
..................\....\TEST.uvguix.Administrator
..................\....\TEST.uvoptx
..................\....\TEST.uvprojx
..................\HARDWARE\BEEP
..................\........\EXTI
..................\........\KEY
..................\........\LED
..................\SYSTEM\delay
..................\......\sys
..................\......\usart
..................\HARDWARE
..................\OBJ
..................\SYSTEM
..................\USER
实验5 外部中断实验

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