Re: Help - hooking up DSP to XScale running CE6!
- From: "Paul G. Tobey [eMVP]" <p space tobey no spam AT no instrument no spam DOT com>
- Date: Thu, 14 Feb 2008 08:56:10 -0700
No, not a good choice! Virtually every device is mapped as memory or I/O.
There's no reason to try to use something that appears like a "disk" as the
basis for your device, which doesn't look anything like a disk. You want to
define what interface you're going to have, then implement the right driver
under that, not start with the underlying driver and try to figure out how
to shoehorn your DSP into that.
Read the help on stream interface drivers. All they are, as Dean said, is a
DLL with a defined set of exported functions in them. It's dead simple. To
get your driver loaded, you have to add some registry entries, but that's
pretty simple too. Once you have the driver loaded, yes, you can use
ReadFile() and WriteFile() to communicate with the driver, if that makes
sense for what you send to send to and receive from the processor. Or you
can build a set of IOCTL values and use DeviceIoControl() to pass data back
and forth. You might, for example, use WriteFile() to send some raw A/D
data to the processor, then use a DeviceIoControl() message to tell the DSP
to calculate the power spectrum, which you might retrieve via ReadFile().
Paul T.
"Steve Conner" <connermcsteve@xxxxxxxxxxxxxx> wrote in message
news:732dc1ce-0016-4c21-baca-bf1793dc8034@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi Dean, thanks for the reply.
You are right, the DSP host port can be mapped into memory.
We have a BSP, but not the source of the BSP. (We're using the
Triton-270 SBC from Ka-Ro and the BSP source was a separate cost
option...) I've already got another application up and running on it,
and I'm now familiar with the process of building OS images, debugging
applications, and so on, but I get really confused when it comes to
device drivers.
I found out that a ramdisk driver ships with CE6, would it be worth
trying that? It seems like I could access my hardware using the same
IO controls you'd use for reading and writing sectors on a disk, and
if I understand right, I'd be more or less doing the same thing when
writing my own driver.
steve
.
- References:
- Help - hooking up DSP to XScale running CE6!
- From: Steve Conner
- Re: Help - hooking up DSP to XScale running CE6!
- From: Dean Ramsier
- Re: Help - hooking up DSP to XScale running CE6!
- From: Steve Conner
- Help - hooking up DSP to XScale running CE6!
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