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From a protocol level, a BULK IN transfer starts when the host starts
polling the respective endpoint. For analysis, it is sometimes useful
to show when the devices starts to answer the requests.
As both are useful for different use cases (the old, default one emphasizes
the host behavior, the new one shows the endpoint/device behavior), make
the display configurable.
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E.g. CONTROL and BULK IN transfers may overlap each other, and as a result
only one of the two can be seen in pulseview.
Partly solves bug #1046. In case a device has multiple IN/OUT endpoints,
transfers would still overlap, but many simple devices have just one each.
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Append OUT data only if it has been ACKed. OUT transfers (BULK OUT or
CONTROL transfer DATA stage) are typically NACKed to create backpressure.
Always keep IN and OUT transfers separate. On the physical layer, the
endpoint number only uses 4 bits, and IN and OUT use separate tokens.
In case the transfer is an IN transfer, set the high bit as used in the
endpoint descriptors (i.e. 0x81 is IN enpoint 1, 0x01 is OUT endpoint 1).
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Improve robustness of some more protocol decoders. Few of them never
checked for the availability of a sample rate in the first place, others
checked for the presence of a spec but would not cope with a value of 0.
Some checked the value only after processing it, which could result in
runtime errors.
This change is motivated by bug #1118.
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Move initialization code of protocol decoders from the constructor to a
new reset() helper method. The libsigrokdecode backend could run this
method several times to clear the decoder's internal state, before new
data from another acquisition gets fed to decode() calls.
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According to the USB 2.0 spec, 8.5.3.4, a protocol stall condition lasts
until the next SETUP transfer. On reception of the SETUP, adjust the end
sample accordingly, and flush the previous CONTROL transfer.
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This is not really relevant for stacked PDs currently (they can be used
unmodified with either PDv2 or PDv3 low-level decoders), but it'll allow
us to drop PDv2 support completely.
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Remove the FSF postal address as it might change (it did in the past).
Reference the gnu.org website instead which is more stable.
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The libsigrokdecode backend now passes metadata (e.g. samplerate) to all
PDs, stacked and non-stacked (see bug #664), so this interim solution is no
longer needed.
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This is more consistent with annotation syntax and looks slightly
better in most cases.
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If a device or host did not receive a handshake 18 bit times after the
EOP, there was a transmission error and the host may repeat the
transmission
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The new decoder stacks on top of the usb_packet PD. It adds one new
annotation row, and is able to save the decoded data as PCAP trace.
It has been successfully tested against all traces in sigrok-dumps and
some more traces.
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