It's actually set in the firmware software code, firmware/usrp3/x300/x300_main.c towards
the end. What the host-side UHD does is ask the firmware running on the X3x0 to reply with
the content of that piece of memory.
How to figure out such things: you see how the code you found access a leaf "fw_version"
in the almighty property tree.
You either get very clever with your debugger, or you're like me and just grep for
fw_version in the uhd/host/ source code for '"fw_version"', find where that property is
created (host/lib/usrp/x300/x300_impl.cpp), then check that source code file for the
values/getters/setters that this property has, and see it is just in the end a value poked
(via `iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_COMPAT_NUM));`) from the
firmware.
From there, you go into uhd/firmware directory and find that place.
I'd honestly do roughly the same as for that firmware compatibility number, but outside
the firmware, directly in FPGA fabric: you instantiate a settings_reg module in your
verilog/VHDL, pick an address that isn't in use yet, and then query it from the iface with
peek just like the compat version getter does. I'd recommend copying an already
functioning settings_reg instance and modifying the address parameter accordingly :)
Best regards,
Marcus
On 08.11.22 18:47, [email protected] wrote:
I found the following line in uhd_usrp_probe that looks like it does what I’m
looking for:
|if (tree->exists(path / "fw_version")) {|
|ss << "FW Version: " << tree->access<std::string>(path / "fw_version").get()|
|<< std::endl;|
|}|
The next question is where does the firmware version get set? I did some poking around
fpga/usrp3/top, but it’s not immediately obvious. Is this set somewhere in the build
scripts? I run the standard Makefile when I build my custom image. I would like to write
something so I can definitely distinguish this FPGA is running my modified firmware.
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