The aim of this application note is to show to scan the 4x4 matrix keypad multiplexed with a four 7-segment display. The software attached to this application note scans the pressed key and displays it on the multiplexed 7- segment LEDs. Thi

mini2440 key 的驱动，创建一个线程来进行扫描IO口扫描，key是开发板上的，不是矩阵键盘，但原理是一样的。-mini2440 key driver to create a thread to scan IO port scan, key is the development board, not a matrix keyboard, but the principle is the same.