Recently bought a development board to study single-chip block, the following is the circuit schematic. Do not understand the above 4 × 4 matrix keyboard (circuit diagram most upper-left corner) encoding principle. 8-lead keyboard directly connected with the p1.0 ^ p1.7, doubts that even if the press any key I have also read p1 level no ah? Look forward to expert advice!

LED键盘模组
...........\ledkey.cfg
...........\LED键盘模组原理图v1.0.pdf
...........\LED键盘模组电路原理图及PCB图.ddb
...........\LED键盘模组自检程序.rar
...........\LED键盘模组说明书.pdf
...........\Readme.txt

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