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Jan Käberich 2022-10-26 22:47:34 +02:00
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Documentation/DeveloperInfo/USB_protocol_v12.pdf
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Documentation/DeveloperInfo/USB_protocol_v12.tex
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@ -257,7 +257,7 @@ Received packets from the device are not acknowledged by the host; the host neve
\subsection{SweepSettings} \subsection{SweepSettings}
Transmitting this packet will switch the LibreVNA into VNA mode and start the sweep. During the sweep, VNADatapoint packets are generated for each completed point in the sweep. Transmitting this packet will switch the LibreVNA into VNA mode and start the sweep. During the sweep, VNADatapoint packets are generated for each completed point in the sweep.
The sampling for each frequency (or power) point in the sweep is done in stages. In each stage, the stimulus can be active at another port. A typical full two-port sweep would therefore use two stages, with the stimulus being active on port 1 during stage 1 and on port 2 during port 2. For faster measurements, this could be reduced to a single stage if only a subset of the S-parameters is required. Similarly, more than two stages can be used (with the stimulus inactive during some) when multiple devices are synchronized. Another device in the setup will have to generate the stimulus during the inactive stages. The sampling for each frequency (or power) point in the sweep is done in stages. In each stage, the stimulus can be active at another port. A typical full two-port sweep would therefore use two stages, with the stimulus being active on port 1 during stage 0 and on port 2 during stage 1. For faster measurements, this could be reduced to a single stage if only a subset of the S-parameters is required. Similarly, more than two stages can be used (with the stimulus inactive during some) when multiple devices are synchronized. Another device in the setup will have to generate the stimulus during the inactive stages.
The packet contains the following fields: The packet contains the following fields:
@ -926,6 +926,9 @@ This packet is used to make the device send the DeviceStatusV1 packet. It has no
\subsection{VNADatapoint} \subsection{VNADatapoint}
The VNADatapoint packet is generated by the device for every completed sweep point when in VNA mode. The VNADatapoint packet is generated by the device for every completed sweep point when in VNA mode.
\begin{important}
This packet has the CRC set to 0x00000000 as the CRC calculation would take too long when using high IF bandwidths.
\end{important}
The packet contains the following fields: The packet contains the following fields:
\begin{ThreePartTable} \begin{ThreePartTable}