[ECOS] using SPI-support of eCOS for the AT91SAM7X

[ECOS] using SPI-support of eCOS for the AT91SAM7X

[Robert Brusa]

Hi
My board has a DS3234 serial Real Time Clock connected to its sip0-bus.  
 From the documentation (ecos-ref-a4.pdf) I concluded that using  
cyg_spi_transer would cover all my requirements. But there is a problem:  
The first argument of this function is a pointer to a type cyg_spi_device.  
I could find nowhere an explanation on how to set up (or get acces to)  
such a structure. Who could provide a few lines of code to show how it is  
done? Thanks
   Robert

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Re: [ECOS] using SPI-support of eCOS for the AT91SAM7X

[Andrew Lunn]

On Fri, Sep 05, 2008 at 11:35:00AM +0200, Robert Brusa wrote:
> Hi
> My board has a DS3234 serial Real Time Clock connected to its sip0-bus.  
> From the documentation (ecos-ref-a4.pdf) I concluded that using  
> cyg_spi_transer would cover all my requirements. But there is a problem:  
> The first argument of this function is a pointer to a type 
> cyg_spi_device. I could find nowhere an explanation on how to set up (or 
> get acces to) such a structure. Who could provide a few lines of code to 
> show how it is done? Thanks

Does you target board have SPI support? 

Take a look at the end of devs/spi/arm/eb55/current/src/spi_eb55.c

This defines an SPI device for the Atmel AT45DB321B DataFlash
connected to the SPI bus on an EB55 development board. You need
something similar for your DS3234.

          Andrew

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Re: [ECOS] using SPI-support of eCOS for the AT91SAM7X

[Robert Brusa]

On Fri, 05 Sep 2008 11:41:12 +0200, Andrew Lunn <andrew@lunn.ch> wrote:

> On Fri, Sep 05, 2008 at 11:35:00AM +0200, Robert Brusa wrote:
>> Hi
>> My board has a DS3234 serial Real Time Clock connected to its sip0-bus.
>> From the documentation (ecos-ref-a4.pdf) I concluded that using
>> cyg_spi_transer would cover all my requirements. But there is a problem:
>> The first argument of this function is a pointer to a type
>> cyg_spi_device. I could find nowhere an explanation on how to set up (or
>> get acces to) such a structure. Who could provide a few lines of code to
>> show how it is done? Thanks
>
> Does you target board have SPI support?
>
> Take a look at the end of devs/spi/arm/eb55/current/src/spi_eb55.c
>
> This defines an SPI device for the Atmel AT45DB321B DataFlash
> connected to the SPI bus on an EB55 development board. You need
> something similar for your DS3234.
>
>           Andrew

It helped. The bus is now working as intended - as I can see using the  
logic analyser. The data read from the RTC are still rubbish, but agree  
perfectly with what I see with the LA. It seems my protoboard has some  
hardware problem. But this is another story.... Thank you for your help.
             Robert

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