How to speed up GPIO

[tiejunhe]

Hi everyone,   I'm working on iMX515, My linux driver has 3 statements :

  gpio_set_value(pin,1);

  gpio_set_value(pin,0);

  gpio_set_value(pin,1);

Then ,I can get a  negative pulse which pulse width is about 320ns. It seems too slowly, How can I speed it up?

[igorpadykov · Accepted solution]

Hi tiejun

one can write small subroutine on assembler for faster access, also it may be

recommended to have L2 cache enabled and the MMU, then try to find the entry

that corresponds to the area where the GPIO registers are mapped and set the

bufferable field for that particular mmu entry.

Best regards

igor

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[tiejunhe]

Thanks,I use your method,and get a negative pulse which width is about 80ns.