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AM3352读GPIO速度很慢



在裸机的情况下去采集一个2.5M的时钟,在下降沿会输出一个数据,发现直接读GPIO寄存器只能读到1M左右,例如不断读取一个2.5M时钟,然后从另外一个脚输出,结果输出的速率就很慢,单独测过输出可以到24Mhz,应该是读GPIO很慢导致输出很慢,请问怎样配置才能加快读GPIO的速率?