Synchronizing USRP Events Using Timed Commands in UHD

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Application Note Number

AN-TC

Revision History

Date Author Details
2020-02-10 Sam Reiter Initial creation

Abstract

This AN discusses Timed Commands in UHD. We will explore usecases, theory of operation, and examples of timed command use in UHD 3.x.

Overview

This application note will cover testing your USRP to verify it is operational. You will need to have a working installation of UHD to preform the following steps to verify your USRP. If you do not have UHD installed, please reference the Building and Installing the USRP Open-Source Toolchain (UHD and GNU Radio) on Linux, OS X and Windows Application Notes.

Alternatively, you may use the Live SDR Environment to perform the following steps. More information about the Live SDR Environment is available at the Live SDR Environment Getting Started Guides page.

Timed Commands: Overview and Usecases

Clocking and Timekeeping in the USRP

CHDR Packet Types and Structure

VITA Time

PPS (Pulse Per Second)

Radio Core Block Timing

General RFNoC block Timing

Command Queue

Summary

USRP Time Sources

Internal PPS

External PPS

GPSDO

UHD API for Timed Commands

Overview of Relevant Methods

Timed Commands vs. Stream Commands with time_spec (remove this?)

Commands that can be timed

Time Resolution of Timed Commands

Example: Using Timed Commands to Phase Align Channels

Example: Using Timed Commands to Control GPIO

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