On 04/28/2012 08:07 AM, Sameh Yassin wrote:
> Dear all,
>
> I need to send data from the OMAP3 to the Spartan3an FPGA. As I understand
> ,from the wiki and presentations, there are two ways to communicate namely;
> using setting_reg and GPIO. The second way seems easier so I'll try it
> first.
>
> I intend to set or clear the free GPIOS on the Spartan FPGA such as
> over_gpio_22. I added the following code to the example tx_waveforms.cpp.
>
> static struct gpio gpio_test = { 22, GPIOF_OUT_INIT_LOW,
> "OVERO_GPIO_22" };
> gpio_set_value(22,1);
> //set gpio22 which is connected to pin IO_L30N_0
>
>
> I tried to compile then I got the error that can't find GPIO.h.
>
> My question: did I use the correct high level function or I used a "lower
> level" that is used to implement the function?
This is the easiest way to toggle gpio's from userspace.
http://wiki.gumstix.org/index.php?title=GPIO#Accessing_GPIO.27s_from_userland
Also:
http://elinux.org/GPIO
The kernel on the e100 already supports the sysfs entries for gpio's.
(UHD uses it)
Philip
>
>
>
> Regards,
> S. Yassin
>
>
>
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