On 26/11/2023 19:28, Ethan C wrote:
I am planning to use the GPIO ATR on a B210 as a PTT signal. Both
channels will be used on the B210. Currently, GPIO ATR can't be
switched from channel A to channel B on the B210 due to the function
not being implemented in UHD, from
EttusResearch/uhd/host/lib/usrp/multi_usrp.cpp
<https://github.com/EttusResearch/uhd/blob/master/host/lib/usrp/multi_usrp.cpp>
|void set_gpio_src( const std::string&, const
std::vector<std::string>&, const size_t) override { throw
uhd::not_implemented_error( "set_gpio_src() not implemented for this
motherboard!"); } |
Could this functionality be implemented with a script that directly
accesses the ATR or tx/rx status registers? Or would I need to build
custom firmware and modify the UHD drivers? Are there any good
resources or tutorials for how to do either of these things?
You'd need to take a deep dive into the B200 implementation code on both
the host side, and the FPGA side. I think what you're
looking for is what we call a "structured walk-through" of the
codebase. No such document exists. The source code is
freely available.
One of the problems with the GPIO is that it has evolved
considerably--used to be something that *SOME* daughterboards
supported, then it started being a motherboard feature, and the
feature-sets and semantics differ considerably depending
on which USRP you're dealing with.
For the B2xx, some models (like the B200) didn't have any GPIO ports
populated, but the B210 did, and so do the "minis".
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