[ts-7000] Re: Write to memory without mmap()?

["Simon" <>]

Awesome, I'll look into it.

The hardware I'm communicating with is a 24-bit ADC chip (MAX11040) so I need 
to be able to communicate at very high speeds if I want to take advantage of 
its capabilities.

Thanks a lot Bret!

--- In  "Breton M. Saunders" <> 
wrote:
>
> Simon,
> 
>    What I would suggest is that you get a copy of linux device drivers.  
> It is pretty essential to having on your desk.
> 
>    Most SPI related things can be fit into some of the template code 
> provided in LDD.  You would most likely create a character mode driver - 
> from which in user space you communicate with via open("/dev/mydriver"), 
> then you perform read(...) and write(...) to do i/o, and use ioctl for 
> control.
> 
>    Inside the kernel you interpret these commands, and buffer data onto 
> and off of the spi fifo.
> 
>    What is the hardware connected to the SPI bus?
> 
>      -Brett
> 
> 
> 
> 
> On 07/19/2010 03:17 PM, Simon wrote:
> > Ok, this is really interesting. Could you give me a little more information 
> > please?
> >
> > --- In  "Breton M. Saunders"<breton.saunders@>  
> > wrote:
> >    
> >> Sounds like you want to write a kernel driver.
> >>
> >>      
> > What do I have to do to write a kernel driver? I've only done C programs 
> > that run from user-space.
> >
> >
> >    
> >> I've run the SPI at pretty close to max rate before, and it works just 
> >> fine.
> >> All you need to do is run it off interrupts in kernel mode.
> >>
> >>      
> > How do I do that? Is there any documentation about that or is there sample 
> > code I can look at?
> >
> >    
> >>       -Brett
> >>
> >>      
> > Thanks Brett!
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>




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