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138中的DSP运算速度的问题

我是采用OMAP138,fpga完成36个通道的20k采样,通过upp传递给dsp,每200ms计算一次36通道的fft运算,每次运算数据量在4096点,但是现在发现,完成36次的fft运算需要时间要在3秒以上,这个太慢了;

目前怀疑是arm和dsp抢ram造成的,可没办法解决,