用AT89S51的并行口P1接4×4矩阵键盘，以P1.0－P1.3作输入线，以P1.4－P1.7作输出线；在数码管上显示每个按键的“0－F”序号

用AT89S51的并行口P1接4×4矩阵键盘，以P1.0－P1.3作输入线，以P1.4－P1.7作输出线；在数码管上显示每个按键的“0－F”序号-AT89S51 using the parallel port P1 then 4 × 4 matrix keyboard to P1.0-P1.3 as input lines to P1.4-P1.7 for output line in digital tube display eac

4x4矩阵键盘在stm32上的实现，采样反转法，实践证明好用-4x4 matrix keyboard stm32 on the realization of sampling inversion method, proved easy to use