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am3354 starterware cachecleanbuff 会影响DMTimer1的中断

最近发现一个问题,用cachecleanbuff,刷新LCD buffer,竟然影响到了DMTimer1的中断。我的timer1每1ms中断一次,在使用cachecleanbuff后,有5ms左右的时间,无法进入timer1中断。

请教如何解决。。。