用51单片机控制硬盘C语言源程序。可以实现51单片机对硬盘进行控制、读写操作等功能。-With 51 single-chip control of the hard disk C language source code. 51 Single-chip can be achieved to control the hard disk, read and write operations and other functions.

51单片机实现4*5矩阵键盘C语言编程，采用反接扫描法。-51 MCU 4* 5 matrix the keyboard C language programming, reverse scan method.