This article describes how to use AD to identify the user s keyboard input methods, compared with dot-matrix recognition has its irreplaceable advantages because if we use 4* 4, then to be consumed eight I/O port, and if the system function in AD, then on may be easily resolved. Singlechip 8051F330 distributed computer and then distributed to ARM. Its principle is to use the sub-ballast resistor, when keys have different voltage, and then quickly read voltage interruption then encode, through the serial port software EASYARM in the personal computer display by experimental observation, the effect can also be.

ADkey 8051F
...........\8051f330 new test
...........\.................\comuni arm
...........\.................\comuni arm.lnp
...........\.................\comuni arm.M51
...........\.................\comuni arm.Opt
...........\.................\comuni arm.plg
...........\.................\comuni arm.Uv2
...........\.................\comuni arm_Opt.Bak
...........\.................\comuni arm_Uv2.Bak
...........\.................\file_main.c
...........\.................\file_main.LST
...........\.................\file_main.OBJ
...........\.................\Fun_file.c
...........\.................\Fun_file.h
...........\.................\Fun_file.LST
...........\.................\Fun_file.OBJ
...........\.................\mytest.c
...........\.................\mytest.LST
...........\.................\mytest.OBJ
...........\.................\STARTUP.A51
...........\ad and irq EINT0 IRQ fen
...........\.........................\ENIT IRQ.mcp
...........\.........................\ENIT_IRQ_Data
...........\.........................\.............\CWSettingsWindows.stg
...........\.........................\.............\DebugInFLASH
...........\.........................\.............\............\TargetDataWindows.tdt
...........\.........................\.............\DebugInRAM
...........\.........................\.............\..........\ENIT IRQ.axf
...........\.........................\.............\..........\ObjectCode
...........\.........................\.............\..........\..........\IRQ.o
...........\.........................\.............\..........\..........\main.o
...........\.........................\.............\..........\..........\Startup.o
...........\.........................\.............\..........\..........\target.o
...........\.........................\.............\..........\TargetDataWindows.tdt
...........\.........................\.............\RelInFLASH
...........\.........................\.............\..........\TargetDataWindows.tdt
...........\.........................\ggfd.txt
...........\.........................\src
...........\.........................\...\config.h
...........\.........................\...\IRQ.s
...........\.........................\...\LPC2294.h
...........\.........................\...\main.c
...........\.........................\...\mem_a.scf
...........\.........................\...\mem_b.scf
...........\.........................\...\mem_c.scf
...........\.........................\...\Startup.s
...........\.........................\...\target.c
...........\.........................\...\target.h
...........\.........................\ur
...........\.........................\..\uart
...........\.........................\..\....\UART Display
...........\.........................\..\....\UART.c
...........\.........................\..\....\UART.h
...........\.........................\利用ADC对通道0.txt
...........\ARM设计竞赛修改.doc
...........\用AD识别用户输入的键盘.txt

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