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PGA280的SPI无法通讯，写了好几天了，望给个例程
这是参考历程，参考一下里面的t280_fn.h， t280_ob.c这两个文件
http://e2e.ti.com/support/data_converters/precision_data_converters/f/73/t/136706.aspx
另外这边有一篇应用手册，里面有实测的数据波形，可以将你的波形与这个波形对比找出问题。
