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Linux/66AK2L06: How to control gpio not using sysfs method?

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Part Number:66AK2L06

Tool/software: Linux

Hello,

I want to output at 4.31 MHz through the gpio pin 3.

But when i was test output frequency, It's maximum frequency is 300KHz.

//

while(1)

{

write(ofd, "1", 1);
write(ofd, "0", 1);

}

//

I try to find another method, for example, mmap or kernel space.

But i don't know how to use...

What's method i to use and how to use to make up frequency.

Thank you.


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