操作定时狗，然后过3秒钟，自动关闭linux系统-control watchdog,and then shut down your system

基于ZedBoard开发板zynq7000处理器，各种外设的操作和控制的工程源码（包括GPIO/中断/看门狗/EDMA/OCM/定时器等）。-A project source based on the zynq7000 SOC of Zedboard development kit，all kinds of peripheral test（including GPIO/interrupt/WTD/EDMA/OCM/timer .etc）.