Re: [Discuss-gnuradio] E100 - Interface between OMAP3 and FPGA

[Sameh Yassin]

Hello Dear ,

I used the first link to use overo GPIOs on the E100 to communicate with the SPARTN3AN FPGA. 

I'm  doing the following:

1- I chose an empty GPIO input to the FPGA (for example overo_gpio22).

2- I modified the FPGA image so that debug_led1 = over_gpio220

3- I'll set and clear overo GPIO using the bash shell as I read in the first link that u recommended.

The problem:

 Although the following gpios are free on the FPGA. There are other gpios  valid on the overo. Srictly speaking

The free GPIOs on the overo 

$ address@hidden:/sys/class/gpio# ls

export gpio16 gpio168    gpiochip128  gpiochip192  gpiochip64  unexport

gpio15 gpio164  gpiochip0  gpiochip160  gpiochip32   gpiochip96

The free gpios at the FPGA found at u1e.v

input overo_gpio0, input overo_gpio14, input overo_gpio21, input overo_gpio22,  // Misc GPIO

input overo_gpio23, input overo_gpio64, input overo_gpio127, // Misc GPIO

input overo_gpio176, input overo_gpio163, input overo_gpio170, // Misc GPIO

Is that normal of I did something wrong at the kernel at the overo?

Regards,
S. Yassin
HW Engineer
DLECS

---

From: Philip Balister <address@hidden>
To: Sameh Yassin <address@hidden>
Cc: "address@hidden" <address@hidden>
Sent: Saturday, April 28, 2012 2:18 PM
Subject: Re: [Discuss-gnuradio] E100 - Interface between OMAP3 and FPGA

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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