Re: [Gumstix-users] SPI output

[Ned F. <nfo...@wh...>]

NewBie_Driver wrote:
> Hi Ned,
> 
> If I understand right, following are the Protocol Drivers for different
> devices, correct ?
> robostix_spi.c, pni11096_spi.c, lis3lv02dq.h and lis3lv02dq_spi.c and I need
> have similar driver for the slave device I plan to use.
> 
> If I use non-kernel method I can just run the application file to
> send/receive packets?
> 
> I have a SPI Adapter from Totalphase.com, I plan to use it to get started.
> It can be in slave mode and display received data on GUI. I can try direct
> method to see the rx/tx working and then move to kernel method.

I think you understand correctly.  It would be easiest to start with the
direct-register access method, and if that works for you, it will be all
you need.

> Any advise for writing a simple protocol driver?

Not really.  The examples on the gumstix wiki are probably good places
to start.  I do not use, and have not tried, the direct-register method.
 My protocol driver is extremely complex and is not a good starting
example; it uses a highly modified version of pxa2xx_spi.c, which
receives 11Mbit/sec data from an externally clocked source.

-- 
Ned Forrester                                       nfo...@wh...
Oceanographic Systems Lab                                  508-289-2226
Applied Ocean Physics and Engineering Dept.
Woods Hole Oceanographic Institution          Woods Hole, MA 02543, USA
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