Hi,
I'm a new driver writer and i'm trying to understand how to deal with XGpio.
My goal is writing a small piece of code that can turn leds on and off. I
think this driver should do it:
#include <linux/init.h>
#include <linux/module.h>
#include "xgpio.h"
#include "xgpio_ioctl.h"
#include "xparameters.h"
XGpio led;
static int myteste_init(void)
{
XGpio_Initialize (&led, LEDs_4Bit);
XGpio_SetDataDirection(&led,1,0);
XGpio_DiscreteWrite(&led,1,0xf);
printk (KERN_ALERT "LEDS: Turn off\n");
return 0;
}
static int myteste_exit(void)
{
XGpio_DiscreteWrite(&led,1,0x0);
printk (KERN_ALERT "LEDS: Turn on\n");
return 0;
}
module_init(myteste_init);
module_exit(myteste_exit);
But i have this error:
ERROR: "XGpio_SetDataDirection" [drivers/char/mytest/mytest.ko] undefined!
ERROR: "XGpio_Initialize" [drivers/char/mytest/mytest.ko] undefined!
ERROR: "XGpio_DiscreteWrite" [drivers/char/mytest/mytest.ko] undefined!
Any suggestion? This is the makefile:
EXTRA_CFLAGS += -I$(TOPDIR)/drivers/xilinx_common
EXTRA_CFLAGS += -I$(TOPDIR)/drivers/char/xilinx_gpio
obj-$(CONFIG_MY_TEST) := mytest.o
Is there any way to use *.dts instead xparameters.h
Thanks,
Bruno
On Tue, Oct 21, 2008 at 9:08 PM, John Linn <[EMAIL PROTECTED]> wrote:
> Hi Bruno,
>
>
>
> I don't think you can do what you're trying to do, unless I'm
> misunderstanding or just not smart enough.
>
>
>
> The EDK from Xilinx ships with drivers that are not Linux drivers. Those
> functions in main below are intended for a standalone (no RTOS) system such
> they can't just be called from a user app in Linux. You are sort of trying
> to create a user mode driver with what you are doing.
>
>
>
> There is a character mode gpio driver in the Xilinx git tree, git://
> git.xilinx.com/linux-2.6-xlnx.git that has been used previously. I don't
> currently test that driver as we're in the process of getting a flattened
> gpio driver that is not char driver ready for mainline.
>
>
>
> I plan to take a look at the char mode gpio driver today as there's another
> question regarding it on the list.
>
>
>
> Thanks,
>
> John
>
>
>
>
> ------------------------------
>
> *From:* [EMAIL PROTECTED] [mailto:
> linuxppc-embedded-bounces+john.linn<linuxppc-embedded-bounces%2Bjohn.linn>
> [EMAIL PROTECTED] *On Behalf Of *Bruno Monteiro
> *Sent:* Tuesday, October 21, 2008 8:36 AM
> *To:* linuxppc-embedded@ozlabs.org
> *Subject:* Compile program using XGpio
>
>
>
> Hi all,
>
>
> I'm working with a Virtex2p. I have a running system using:
>
> - EDK 9.1
> - Crosstool-ng (svn)
> - linux-2.6-xlnx
> - BusyBox 1.12.1
>
> Now, i'm trying to build a small program that turn off leds. I guess it
> should be something like this:
>
> void main (void){
> XGpio led;
> XGpio_Initialize (&led, XPAR_LEDS_4BIT_DEVICE_ID);
> XGpio_SetDataDirection(&led,1,0);
> XGpio_DiscreteWrite(&led,1,0xf);
> }
>
>
> I want to know how to compile it (without EDK). Any suggestion?
>
>
> Thanks,
> Bruno Monteiro
>
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