GPIO pins Frequency

Hi,


What is maximum freq. of GPIO pins in Mini2440 Arm Board.
I want to send data on GPIO pins with maximum speed.



Let me know ?

hi.

I am currently on same issue. i have got around 750 Hz with shell script &
and aroung 850 Hz from c program both form user-space.

http://www.friendlyarm.net/forum/topic/3476

the conclusion is, to achieve maximum speed you have to write gpio kernel
drivers.

Hi ,

I have got upto 380 to 400 khz freq. from kernel space.

@Jaydeep,

From shell script I am able to get only 400 khz and the same from the C
program, I have written driver for the same, but still I am unable to get
the max. freq. as per your saying. 

can you please let me know which kernel you're using and how you're calling
gpio pin. can you please let us know exactly what you've done.

I do set value 1 and 0 from the shell script and measure freq. in
Oscilloscope. Your guidance will be much helpful to us.

regards,
armman