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mcbsp+dma问题(dsp5517),求解答,急急!

Other Parts Discussed in Thread: SPRC133

最近在用DSP5517,使用DMA的mcbsp

事件触发功能,但是遇到两个问题,

1dma源地址的数组的值都是0,但是示波器测到的值是随机的。不知道值从何而来。

2DMA

产生的时间不定。主程序什么都不做的情况在,中断时间是20ms,主程序有别的功能实现会导致中断时间不定。