anant.tripa...@technosci.com wrote: > Pretty much what the title says, our goal is to sync the timestamps to the > rising edge of the 1PPS signal such that they get reset exactly on the rising > edge of the 1pps signal, and increment the count of a custom metadata tag, to > the outgoing stream to the UHD application that we are working on.
--- Hey,\ \ If you are using the existing PPS in port, [there are already existing functions that can set the timestamps to an arbitrary value on the next PPS edge.](https://uhd.readthedocs.io/en/latest/classuhd_1_1rfnoc_1_1mb__controller_1_1timekeeper.html#a7a33e5c85c32cfb8c23937eb29b51a84)\ \ Since you did not specify which USRP device you are using I am just going to give the general approach.\ \ Via RFNoC Python API you should be able to access these via the timekeeper on the motherboard:\ \ `graph = uhd.rfnoc.RfnocGraph("addr=<Address of your device>") # Set pps source to external here if you need it, depending on device this would be the time_source=external argument.` `tk = graph.get_mb_controller().get_timekeeper(0) # Some devices have more then one timekeeper, using 0 as default.` `tk.set_ticks_next_pps(0) # Sets timestamp counter to 0 on next pps edge, you can also set it to an arbitrary value here.` \ Regarding getting GPIO access from within your custom RFNoC block, that is dependent on the device you have, and can be a little bit more complicated. Hope this helps a little. Regards, \ Niels
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