Turn on Leds

You can use gpio to control the LEDs,

http://www.nioswiki.com/gpio

You can control LED on/off with led sysfs class in /sys/class/leds.

- Hippo

Hi,

I have follow the instructions of NiosWiki about Gpio, but something I have done wrong because when I write in the terminal the command --> "make" appears an error about na_gpio_0 undeclared.

Before writing make, I have written make menu config Where I pointed-->

customize kernel and customize application. Also in processor type and features-->gpio interface and finally device driver-->led support.

I attached a picture about the error, if someone can give a hand

Thanks

Please check the hardware. The gpio instance in your sopc builder should be named as "gpio_0".

- Hippo

Thanks for your answers Hippo.

Doing in this manner I associated a Pio component(Sopc_Builder) with Gpio in linux.But what happens If I would like to insert another Pio component in Sopc_Builder and the two of them I would like to use with gpio. Then I would have two variables in Sopc_Builder for one gpio variable.

The other question that I have is that in your first answer you said:" you can control led on/off with led sysfs class in /sys/class/leds."

When I enter in /uClinux-dist/romfs/sys there aren't nothing , maby it is not the correct path? The drivers are installed(GPIO and LEDS), they appear in /uClinux-dist/linux-2.6.x/drivers

Thanks a lot for your time

Please note that gpio and altera PIO is different. You can use them separated. Connect your LED to gpio.

For LED sysfs usage, please see,

http://www.avrfreaks.net/wiki/index.php/documentation:linux/leds

- Hippo

Is there anyway to make gpio *inputs* available in userspace? I have this LED stuff working, but now I need some inputs.

Here they descirbe a more complete interface where direction can be set via sysfs, but it does not seem to exist in the Nios2 Linux distro.

http://www.avrfreaks.net/wiki/index.php/documentation:linux/gpio

Is that not available for Nios2?

Thanks,

Dave ...