非常简单的腾龙学习板矩阵键盘C程序我当时学习腾龙板时写的第一个成功的矩阵键盘显示程序，应该说很简单易懂。希望对初学者有点帮助-Tamron very simple C program to learn the keyboard matrix board to learn the Dragon boards I was the first to write a successful matrix keyboard display program, it should be said that it is easy to understand. Want to be helpful for beginners