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PGA970正弦波数据加载问题

user628524
Prodigy 220 points
Other Parts Discussed in Thread: PGA970

老老实实按上面步骤做了，只是第4点，加载Load the waveform RAM with quarter-waveform values.不知道怎么搞，是PGA970内部自己加载，还是我自己先准备好正弦表通过SPI写到PGA970里面去？

结果就是正弦波没出来，求助？