Re: Using devmem2 to access GPIO and HW registers on AT91SAM9260

["Chestnut" <lw0110@xxxxxxxxx>]

Hello Eric,

Do you have some advices on GPIO programming in kernel space? Do you have 
some same code I can follow?
Accessing GPIO directly from kernel space is different from user space, am I 
right?

Regards,
Joe

----- Original Message -----
From: "Eric BENARD" <ebenard@xxxxxxx>
To: "Paul Kavan" <pkavan@xxxxxxxxx>
Cc: <linux-arm@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, April 04, 2007 4:29 PM
Subject: Re: Using devmem2 to access GPIO and HW registers on AT91SAM9260

hi Paul,

Paul Kavan a écrit :
> Some kind folks from this list have helped me determined that mmap
> ought to be able to access the pins and registers on an at91sam9260. I
> have some code compiled to do just that. The only difficulty now is
> determining where linux is mapping these to. Has anyone had any
> success using devmem2 with at at91sam9260 or something similar to
> read/write pins/registers. If so, how did you determine where to
> locate those items on the mmap?
you may start from the gpio utility for AT91RM9200 and update it to the
memory map of AT91SAM9260 :
http://www.ipbx.ru/rm9200/gpio-RM9200.tar.gz

Eric

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