External interrupt register version, the use of the system tick timer delay

EXTI-NVIC\app\beep\beep.c
.........\...\....\beep.h
.........\...\key\key.c
.........\...\...\key.h
.........\...\led\led.c
.........\...\...\led.h
.........\...\nixieTube\nixietube.c
.........\...\.........\nixietube.h
.........\...\system\system.c
.........\...\......\system.h
.........\...\usart\usart.c
.........\...\.....\usart.h
.........\JLink Regs CM3.txt
.........\JLinkSettings.ini
.........\keilkilll.bat
.........\obj\pro.hex
.........\pro.uvopt
.........\pro.uvproj
.........\STM32F10x.s
.........\user\main.c
.........\app\beep
.........\...\key
.........\...\led
.........\...\nixieTube
.........\...\system
.........\...\usart
.........\app
.........\obj
.........\user
EXTI-NVIC

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