The keyboard with the serial port driver design, write a program to complete the keyboard driver, realize the keyboard scan, and, according to the key value of and seven segment digital tube display

Keyboard_Test
.............\44binit.s
.............\44blib.c
.............\8led.c
.............\debug
.............\.....\44binit.o
.............\.....\44blib.o
.............\.....\8led.o
.............\.....\keyboard.o
.............\.....\Keyboard_Test.elf
.............\.....\led.o
.............\.....\Link.o
.............\.....\main.o
.............\.....\uhal.o
.............\ev40boot.cs
.............\keyboard.c
.............\keyboard.h
.............\Keyboard_Test.ews
.............\Keyboard_Test.opt
.............\Keyboard_Test.pjf
.............\led.c
.............\main.c
.............\ram_ice.ld

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