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| author | Stefan Brüns <stefan.bruens@rwth-aachen.de> | 2019-06-17 19:51:29 +0200 |
|---|---|---|
| committer | Stefan Brüns <stefan.bruens@rwth-aachen.de> | 2019-06-17 19:51:29 +0200 |
| commit | 7c4029417cbdd12fdbfbd2a94107e215c1eaa605 (patch) | |
| tree | c127f00bce1ce593ec731b6b36472d835cbff687 | |
| parent | ff73d589b60677cf405d8e6af8810c849595fd7a (diff) | |
| download | libsigrokdecode-7c4029417cbdd12fdbfbd2a94107e215c1eaa605.tar.gz libsigrokdecode-7c4029417cbdd12fdbfbd2a94107e215c1eaa605.zip | |
usb_request: Fix some decoding errors
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).
| -rw-r--r-- | decoders/usb_request/pd.py | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/decoders/usb_request/pd.py b/decoders/usb_request/pd.py index 49b0b35..25ee4c5 100644 --- a/decoders/usb_request/pd.py +++ b/decoders/usb_request/pd.py @@ -211,7 +211,8 @@ class Decoder(srd.Decoder): self.handle_request(request_started, request_end) elif request['type'] in (None, 'BULK OUT') and self.transaction_type == 'OUT': request['type'] = 'BULK OUT' - request['data'] += self.transaction_data + if self.handshake == 'ACK': + request['data'] += self.transaction_data self.handle_request(request_started, request_end) # CONTROL, SETUP stage @@ -231,7 +232,8 @@ class Decoder(srd.Decoder): request['data'] += self.transaction_data elif request['type'] == 'SETUP OUT' and self.transaction_type == 'OUT': - request['data'] += self.transaction_data + if self.handshake == 'ACK': + request['data'] += self.transaction_data if request['wLength'] == len(request['data']): self.handle_request(1, 0) @@ -339,6 +341,8 @@ class Decoder(srd.Decoder): self.es_transaction = es self.transaction_state = 'TOKEN RECEIVED' self.transaction_ep = ep + if ep > 0 and pname == 'IN': + self.transaction_ep = ep + 0x80 self.transaction_addr = addr self.transaction_type = pname # IN OUT SETUP |