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The 'usb_signalling' decoder just decodes symbols from D+/D- levels,
handles bit stuffing and outputs the symbols and (potential) packets.
The 'usb_protocol' decoder takes that output and tried to parse USB
packets from it (SOF, SETUP, IN, OUT, DATA0, and so on).
This is the base decoder on top of which various others will stack
later on.
The two new PDs are work in progress, so we still keep the old 'usb' PD
around for a little while, until the two new ones are fully working and
well-tested.
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Also, add missing ones which are mentioned in the USB spec. However, not
all may be relevant for LS/FS signalling. But they're still useful to
have in the table, so we can output warnings like
"Warning: HS PID encountered, but device is FS???"
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Some of the differences of USB low-speed (compared to full-speed) are:
- 1.5Mb/s datarate, not 12MBit/s.
- The J and K states are swapped/inverted.
Note: This is work in progress, further changes may still be needed.
Add a 'signalling' option, which allows the user to select whether the
PD should decode using the low-speed or full-speed signalling protocol.
If unspecified, the default is full-speed.
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The samplenum/scount handling was broken recently (mea culpa), and the
DP/DM probes were swapped.
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Also, fix minor consistency issues, cosmetics, typos.
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- List all API methods and metadata variables in all PDs to make things
easier and more consistent for new PD writers.
- Fix probe assignment in a few PDs.
- Raise exceptions upon invalid states of the PD state machines (bug).
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