开发环境为RVDS4.0，基于开发板Tiny6410，,按键控制led和beep，按键通过外部中断方式来控制；当按下K1，四个用户led显示为流水灯；当按下K2，led全灭；当按下K3，led全亮；当按下K4，beep响一声；-Development environment for RVDS4.0, based development board Tiny6410,, key control led and beep, buttons to control through external in