[Buildroot] GPIO

[Buildroot] GPIO

[Johnny Beardsmore]

Hi,

I product I worked on a while ago has returned to haunt me.

Essentially, I need support for a GPIO port on a pc-104.  I've perused the configuration settings in Buioldroot, but wasn't able to spot anything that looked suitable.  Is it, and has anyone any experience with doing so?

Regards,
JNY
 		 	   		  
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[Buildroot] GPIO

[Baruch Siach]

Hi Johnny,

On Thu, Oct 21, 2010 at 08:29:13AM +0000, Johnny Beardsmore wrote:
> I product I worked on a while ago has returned to haunt me.
> 
> Essentially, I need support for a GPIO port on a pc-104.  I've perused the 
> configuration settings in Buioldroot, but wasn't able to spot anything that 
> looked suitable.  Is it, and has anyone any experience with doing so?

If you have a recent enough Linux kernel, and a driver supporting gpiolib for 
your GPIO port, then you can use the sysfs based interface for controlling 
GPIO lines. See Documentation/gpio.txt in the Linux kernel sources.

For a list of GPIO drivers in your kernel see drivers/gpio/Kconfig.

baruch

-- 
                                                     ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch at tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -

[Buildroot] GPIO

[Peter Korsgaard]

>>>>> "Johnny" == Johnny Beardsmore <jny0@hotmail.com> writes:

 Johnny> Hi,
 Johnny> I product I worked on a while ago has returned to haunt me.

 Johnny> Essentially, I need support for a GPIO port on a pc-104.  I've
 Johnny> perused the configuration settings in Buioldroot, but wasn't
 Johnny> able to spot anything that looked suitable.  Is it, and has
 Johnny> anyone any experience with doing so?

That's a kernel question rather than an issue about userspace rootfs
configuration.

Have a look at the gpio options in the kernel and Documentation/gpio.txt
in the kernel sources for information of how to access them through
sysfs.

-- 
Bye, Peter Korsgaard