通过I/O串口控制的红绿灯控制程序，实用于初学者-Through the I/O serial control traffic light control procedures, and practical at the beginner

DSP处理器开发的入门级内容，包括了GPIO，跑马灯，红绿灯，键盘控制等一系列的例程。非常的全！-DSP processor development of entry-level content, including GPIO, marquees, traffic lights, keyboard control and a series of routines. Very full!