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如何操作gpio而不经过sysfs

我想用gpio模拟spi来配置一个芯片(在linux应用层下配置,靠谱不?)...貌似直接通过sysfs来操作gpio会太慢?

在这里求,直接操作gpio(输出电平,或者输入脚的值),有没有现成的例子??

我是ipnc rdk 3.5 for dm8127