连线：两个单片机用3根线连起来，要共地,rxd,txd要交叉连接 程序效果：通过主机发送，从机接收 在主机中通过记下按键按下的次数，主机中显示最后 按下的六个数值，并发送给从机，从机也显示这六个数值-Connection: two microcontrollers with three lines connected together to a common ground, rxd, txd cross-linker to the effect: By sending host r