Key processing and display, four digital control to achieve key functions button 1 subtraction function menu key, key 2, move the cursor, the cursor keys 3,4 values

STEP4-KEY(H)\Output\EX4-KEY
............\......\EX4-KEY.hex
............\Project\EX4-KEY.uvopt
............\.......\EX4-KEY.uvproj
............\.......\EX4-KEY_uvopt.bak
............\.......\EX4-KEY_uvproj.bak
............\.......\main.c
............\.......\STARTUP.A51
............\.ublic\App_Debug.h
............\......\delay.c
............\......\delay.h
............\......\display.c
............\......\display.h
............\......\eventhandler.c
............\......\eventhandler.h
............\......\key.c
............\......\key.h
............\Output
............\Project
............\Public
STEP4-KEY(H)

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