串口调试程序，本人第一次发，呵呵，肯能给大家带来帮助，这个程序是我借助串口来调试外部RAM用的，希望能给大家带来帮助 -serial debugger, I made the first, huh, willing to give us some help. this procedure is to use serial debugging external RAM with the hope that we can help bring