From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: "Reitinger, Peter" <preitinger@carl-valentin.de>,
"xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: Re: [Xenomai] access SPI and DMA hardware from application ("external abort...")
Date: Fri, 15 Aug 2014 17:52:51 +0200 [thread overview]
Message-ID: <53EE2CD3.507@xenomai.org> (raw)
In-Reply-To: <e3bdea6dcdb84852972a720789331cb2@CVEX13.valentin-carl.de>
On 08/15/2014 08:47 AM, Reitinger, Peter wrote:
> Hello,
>
> meanwhile I have solved the issue on my own. I tried to access the
> SPI1 HW with traditional mmap approach from user space and had the
> same problem until I saw that I had to start the whole SPI1 module by
> setting a specific control bit to enable its clock. Sorry for posting
> this, but I was really puzzled then. I guess it will also be possible
> to access the hw registers of the SPI with the xenomai rtdm io user
> mapping now...
It is normally recommended to implement drivers in kernel-space using
the RTDM API: this forces you to define a standard interface
(open/read/write/ioctl) between application and driver, which makes it
easy to re-use the same driver in a different application, or to
implement a driver for a differrent hardware without changing your
application.
--
Gilles.
next prev parent reply other threads:[~2014-08-15 15:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.1.1408010401.9958.xenomai@xenomai.org>
2014-08-15 6:47 ` [Xenomai] access SPI and DMA hardware from application ("external abort...") Reitinger, Peter
2014-08-15 15:52 ` Gilles Chanteperdrix [this message]
[not found] ` <8a9221baf06e4cf8b7ad859fab3af388@CVEX13.valentin-carl.de>
2014-08-19 20:34 ` Gilles Chanteperdrix
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