[ECOS] at91sam7 spi test code

[ECOS] at91sam7 spi test code

[Frank Wu]

Dear All,

I want to use SPI bus on a sam7 uC. Where can I find SPI test code to
make sure the SPI driver works?

Thanks,

Frank

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Re: [ECOS] at91sam7 spi test code

[Andrew Lunn]

On Tue, Jan 30, 2007 at 12:36:40PM -0800, Frank Wu wrote:
> Dear All,
> 
> I want to use SPI bus on a sam7 uC. Where can I find SPI test code to
> make sure the SPI driver works?

This is not easy. You need a device on the bus and a driver for the
device. It is not really possible to test the SPI bus driver without
testing the SPI device device driver at the same time.

So i suggest you just write your device device driver and maybe
connect a logic analyser/3-channel digital oscilloscope to the SPI bus.

        Andrew

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Re: [ECOS] at91sam7 spi test code

[Frank Wu]

Hi Andrew,

It is very easy to get a SPI eeprom sample chip on line to be the SPI device.
Maybe my question is not addressed clearly. What I want is how to use
SPI driver in eCos porting to at91sam7 evaluation board (I have the
board). Something like,
1) Initialize the spi port
2) write
3) read
4) use in interrupt/pulling mode

Thanks

Frank


On 1/30/07, Andrew Lunn <andrew@lunn.ch> wrote:
> On Tue, Jan 30, 2007 at 12:36:40PM -0800, Frank Wu wrote:
> > Dear All,
> >
> > I want to use SPI bus on a sam7 uC. Where can I find SPI test code to
> > make sure the SPI driver works?
>
> This is not easy. You need a device on the bus and a driver for the
> device. It is not really possible to test the SPI bus driver without
> testing the SPI device device driver at the same time.
>
> So i suggest you just write your device device driver and maybe
> connect a logic analyser/3-channel digital oscilloscope to the SPI bus.
>
>        Andrew
>

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Re: [ECOS] at91sam7 spi test code

[jiang jet]

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All device drivers in Ecos are almost the same.you have to implement two 
MACRO, DEVTAB_ENTRY,DEVIO_ENTRY, here you can do the job you decribe, 
initialization..read write register interrupt and so on..
BTW, you have to make sure ur bus work correctly, or else it will be a 
nightmare for u to debug device driver...

jet


>From: "Frank Wu" <qiongwu23@gmail.com>
>To: "Frank Wu" <qiongwu23@gmail.com>,  	ecos-discuss 
<ecos-discuss@ecos.sourceware.org>
>Subject: Re: [ECOS] at91sam7 spi test code
>Date: Tue, 30 Jan 2007 16:55:35 -0800
>
>Hi Andrew,
>
>It is very easy to get a SPI eeprom sample chip on line to be the 
>SPI device.
>Maybe my question is not addressed clearly. What I want is how to 
>use
>SPI driver in eCos porting to at91sam7 evaluation board (I have the
>board). Something like,
>1) Initialize the spi port
>2) write
>3) read
>4) use in interrupt/pulling mode
>
>Thanks
>
>Frank
>
>
>On 1/30/07, Andrew Lunn <andrew@lunn.ch> wrote:
>>On Tue, Jan 30, 2007 at 12:36:40PM -0800, Frank Wu wrote:
>> > Dear All,
>> >
>> > I want to use SPI bus on a sam7 uC. Where can I find SPI test 
>>code to
>> > make sure the SPI driver works?
>>
>>This is not easy. You need a device on the bus and a driver for the
>>device. It is not really possible to test the SPI bus driver 
>>without
>>testing the SPI device device driver at the same time.
>>
>>So i suggest you just write your device device driver and maybe
>>connect a logic analyser/3-channel digital oscilloscope to the SPI 
>>bus.
>>
>>        Andrew
>>
>
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>Before posting, please read the FAQ: 
>http://ecos.sourceware.org/fom/ecos
>and search the list archive: 
>http://ecos.sourceware.org/ml/ecos-discuss
>

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Re: [ECOS] at91sam7 spi test code

[Andrew Lunn]

On Tue, Jan 30, 2007 at 04:55:35PM -0800, Frank Wu wrote:
> Hi Andrew,
> 
> It is very easy to get a SPI eeprom sample chip on line to be the SPI 
> device.
> Maybe my question is not addressed clearly. What I want is how to use
> SPI driver in eCos porting to at91sam7 evaluation board (I have the
> board). Something like,
> 1) Initialize the spi port
> 2) write
> 3) read
> 4) use in interrupt/pulling mode

O.K. So you need to read the manual:

http://ecos.sourceware.org/docs-latest/ref/io-spi.html

There is already a driver for the AT91SAM7S and AT91SAM7X, so there is
no need to write any new driver code. 

What you need is a structure for each device on the bus. eg see
packages/devs/spi/arm/eb55/current/src/spi_eb55.c which declares a
DataFlash device on the bus. And you need a device drives for the
device, eg  packages/disk/generic/mmc/current/src

Unfortunately, i don't think there is a complete example in anoncvs of
all the parts coming together for one development board :-(

    Andrew

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[ECOS] Fwd: [ECOS] at91sam7 spi test code

[Nikita Tabatsky]

Hi Frank.

There you can find an example of work with SD MMC cards.
http://www.siwawi.arubi.uni-kl.de/avr_projects/arm_projects/efsl_arm/index.html

".....Memory-cards like SD-Cards or MMC offer a huge amount of memory
and are relativly cheap. SD-Cards and MMC can be accessed in SPI-Mode
so only 4 data-lines are needed to connect such cards to a
microcontroller (chip-select, MOSI, MISO, SCK). To read and write data
from/to the  card with a "standard"-PC a filesystem is needed......"


Best Regards,
  Nikita

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