Hi Jan,
Thank you so much for your reply!
In my driver, I wrote:
int map_io( struct gpiodrv_context *dev_context, rtdm_user_info_t
*user_info, struct MAPPED_IO *io )
{
int ret;
if ((dev_context == 0) || (user_info == 0) || (io == 0))
return -EFAULT;
if (dev_context->mapped_user_info != 0)
{
if ((ret = gpio_unmap_io( dev_context )) != 0)
return ret;
}
dev_context->mapped_user_info = user_info;
ret = rtdm_iomap_to_user( user_info, MPC52xx_PA(
MPC52xx_GPIO_WKUP_OFFSET + 0x0C ),
1, PROT_READ | PROT_WRITE, (void
**)&(io->gpio_heart_beat), NULL, NULL );
if (ret != 0)
goto __ERROR;
else
dev_context->mapped_heart_beat = (void
*)io->gpio_heart_beat;
return 0;
__ERROR:
gpio_unmap_io( dev_context );
return ret;
}
In the application, I wrote:
int main(int argc, char *argv[])
{
int dev_gpio;
struct MAPPED_IO gpio;
signal(SIGTERM, clean_exit);
signal(SIGINT, clean_exit);
mlockall( MCL_CURRENT | MCL_FUTURE );
rt_task_shadow( &mainapp, "mainapp", 1, 0 );
dev_gpio = rt_dev_open( "gpio", 0 );
if (dev_gpio < 0)
{
return -1;
}
gpio.gpio_heart_beat = NULL;
if (rt_dev_ioctl( dev_gpio, 1, &gpio ) != 0)
{
return -1;
}
gpio.gpio_heart_beat[0] = 0x01;
...
}
I also tried another way by opening "/dev/mem" and then using "mmap" to
map the I/O memory addresses in the application. It worked!
I am very curious about why "rtdm_iomap_to_user" did not work for me.
Thanks,
Haobo
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: May 10, 2007 5:40 PM
To: Zhang, Haobo
Cc: [email protected]; [EMAIL PROTECTED]
Subject: Re: [Xenomai-help] rtdm_iomap_to_user question
Zhang, Haobo wrote:
> Hi,
>
> I am currently working on a project which is running on a PowerPC
> platform. In my rtdm driver, I use "rtdm_iomap_to_user" to map a few
> I/O memory locations to be accessed from my application. All the
> function calls seem to work (no error code returned). But my
> application fails to use these pointers to manipulate any I/O. Is
> there any restrictions I have to be aware in order to use those mapped
> I/O mem? I am new to xenomai. I would really appreciate any help to
this.
Maybe you can post code or relevant code snippets so that we can have a
look. As I personally haven't work with this particular service yet, I
put Stelian in CC who contributed it and might already have some
suggestion. But, again, code talks much more.
Jan
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