Hi,
I previously sent this to the alsa-devel list, but it appears to have been the
wrong one. I apologize for the duplicate post.
I'm designing software for a specific test application that will utilize an
Intel HD audio controller. I must verify the functionality of several sets of
TDM audio signals (CK, FS, TXD, RXD) from the Intel HD Audio controller. In
this scenario, the Intel HD Audio controller is NOT connected directly to a
CODEC, but to a header. My proposal is to connect these signals directly to
an FPGA, using it to loopback the data (in various permutations of loopback to
channels) to verify each of the signals. Because the FPGA will be in place of
a real CODEC device, I'm concerned with how the software side of this approach
will work? I essentially just want to push a known bitstream through one TDM
interface and verify it upon reception via an alternate TDM interface. This
doesn't necessarily require actual audio data. Lastly, I should point out that
the system will be tested with it booted to Linux (using a recent kernel 3.x)
so utilizing the standard linux audio interfaces (like ALSA - though this isn't
a requirement) is preferable to expedite development.
I have spent several hours reading over documentation at the official site and
elsewhere, but am left unsure of how to accomplish my goal. I am hopeful it is
simply a matter of ALSA configuration, but am not sure if that will suffice,
nor how to accomplish it.
The test method (hardware configuration) is unlikely to change, so I'm
soliciting any suggestions and information that you all have to enable sending
and receiving a specific data stream over the TDM interfaces of the Intel HD
Audio controller.
Thanks,
-Kelly
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