4*4键盘扫描，采用列扫描法。依次对每列输出扫描电位，再从行输入扫描电平，通过该值判断被按下的键-4* 4 keyboard scanning, the use of column scanning method. Followed by scanning the output for each column potentials, input from the scan line level, the adoption of the value judgments of the key is

计算机测控实验 键盘显示实验C语言源码 要求结合显示部分程序，当按下某个键时，在数码管上显示键值，如按 下键“1”时，数码管上显示1，需要显示的键值范围为“1~F”，键“B” 用小写字符“b”显示，键“D”用小写字符“d”显示，其余字母用大 些表示；-Control experiments showed that the experimental computer keyboard combination of C language source code shows part