Implement STM32 digital display key functions

KEYSCAN
.......\V1
.......\..\CMSIS
.......\..\.....\core_cm3.c
.......\..\.....\core_cm3.h
.......\..\.....\stm32f10x.h
.......\..\.....\system_stm32f10x.c
.......\..\.....\system_stm32f10x.h
.......\..\demo.uvgui.Marshal
.......\..\demo.uvgui_Marshal.bak
.......\..\demo.uvopt
.......\..\demo.uvproj
.......\..\demo_Target 1.dep
.......\..\demo_uvopt.bak
.......\..\demo_uvproj.bak
.......\..\DigitalLED
.......\..\..........\DigitalLED.c
.......\..\..........\DigitalLED.h
.......\..\Doc
.......\..\KEYSCAN
.......\..\.......\keyscan.c
.......\..\.......\keyscan.h
.......\..\list
.......\..\....\demo.map
.......\..\....\DigitalLed.map
.......\..\....\keyscan.map
.......\..\....\startup_stm32f10x_md.lst
.......\..\MDK-ARM
.......\..\.......\startup_stm32f10x_md.s
.......\..\.......\startup_stm32f10x_md_vl.s
.......\..\Output
.......\..\......\core_cm3.crf
.......\..\......\core_cm3.d
.......\..\......\core_cm3.o
.......\..\......\delay.crf
.......\..\......\delay.d
.......\..\......\delay.o
.......\..\......\demo.axf
.......\..\......\demo.build_log.htm
.......\..\......\demo.htm
.......\..\......\demo.lnp
.......\..\......\demo.sct
.......\..\......\DigitalLed.build_log.htm
.......\..\......\digitalled.crf
.......\..\......\digitalled.d
.......\..\......\DigitalLed.htm
.......\..\......\DigitalLed.lnp
.......\..\......\digitalled.o
.......\..\......\DigitalLed.sct
.......\..\......\keyscan.axf
.......\..\......\keyscan.build_log.htm
.......\..\......\keyscan.crf
.......\..\......\keyscan.d
.......\..\......\keyscan.hex
.......\..\......\keyscan.htm
.......\..\......\keyscan.lnp
.......\..\......\keyscan.o
.......\..\......\keyscan.sct
.......\..\......\led.crf
.......\..\......\led.d
.......\..\......\led.o
.......\..\......\main.crf
.......\..\......\main.d
.......\..\......\main.o
.......\..\......\misc.crf
.......\..\......\misc.d
.......\..\......\misc.o
.......\..\......\startup_stm32f10x_md.d
.......\..\......\startup_stm32f10x_md.o
.......\..\......\stm32f10x_adc.crf
.......\..\......\stm32f10x_adc.d
.......\..\......\stm32f10x_adc.o
.......\..\......\stm32f10x_bkp.crf
.......\..\......\stm32f10x_bkp.d
.......\..\......\stm32f10x_bkp.o
.......\..\......\stm32f10x_can.crf
.......\..\......\stm32f10x_can.d
.......\..\......\stm32f10x_can.o
.......\..\......\stm32f10x_cec.crf
.......\..\......\stm32f10x_cec.d
.......\..\......\stm32f10x_cec.o
.......\..\......\stm32f10x_crc.crf
.......\..\......\stm32f10x_crc.d
.......\..\......\stm32f10x_crc.o
.......\..\......\stm32f10x_dac.crf
.......\..\......\stm32f10x_dac.d
.......\..\......\stm32f10x_dac.o
.......\..\......\stm32f10x_dbgmcu.crf
.......\..\......\stm32f10x_dbgmcu.d
.......\..\......\stm32f10x_dbgmcu.o
.......\..\......\stm32f10x_dma.crf
.......\..\......\stm32f10x_dma.d
.......\..\......\stm32f10x_dma.o
.......\..\......\stm32f10x_exti.crf
.......\..\......\stm32f10x_exti.d
.......\..\......\stm32f10x_exti.o
.......\..\......\stm32f10x_flash.crf
.......\..\......\stm32f10x_flash.d
.......\..\......\stm32f10x_flash.o
.......\..\......\stm32f10x_fsmc.crf

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