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D1s跑rtthread，配置音频驱动通过DMA固定传输32KB字节数据，中断时间大概170ms，进中断后翻转一个IO口。应用层读取nor flash，会改变音频的DMA中断时间，中断时间变为6ms左右，这个会是什么问题导致音频DMA传输速度变快了？
已解决，之前修改了底层的hal_dma.c中的中断回调函数导致的
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