Re: what bus architecture should I choose for my custom DAQ board?

Ian Abbott wrote:
> On 13/02/2006 05:54, wicky.zhang wrote:
>> Recently, I ordered a FPGA development board of Xilinx (ML403) with a 
>> PPC core inside the main FPGA chip, and Linux is ported to it by 
>> Xilinx. What i want to do is to design a 8 channel A/D and 8 channel 
>> D/A daughter card of the development board and write the comedi 
>> driver for the daughter card. I choose 2 parallel interface A/D and 2 
>> parallel D/A chip (all are 16bits) and connect them to the local bus 
>> of PPC core, can I write Comedi driver to it? I notice that Comedi 
>> driver is mainly for that of PCI bus architecture DAQ cards. Thanks 
>> in advance.
>
> There shouldn't be any problem writing a custom Comedi driver for it. 
> All the bus-specific hardware access is confined to the individual 
> device drivers; the Comedi core does not depend on hardware at all!
>
> As this is a fairly specialized application, you probably want to 
> avoid building the full suite of drivers and just build your custom 
> driver and the Comedi core.  You can edit the 
> comedi/drivers/Makefile.am file to do that (followed by running 
> ./autogen.sh to regenerate and rerun the ./configure script).
>
Thank you, I know that the Comedi core does not depend on hardware at 
all, but for my particular application, i think that choosing  an 
appropriate  interface should  simplify  the  programming work because 
lots of reference. Finally, I choose SPI interface A/D and D/A chip, 
does anyone have experience about it? I have not written any Comedi 
driver at all.

Thank you!

Best regards,

Wicky