LPC MicrocontrollersのトピックRe: SDK 2.5.0:USB0 host ctrl:ISO IN cbf invoked with "transfer->transferSofar" always 0

SDK 2.5.0:USB0 host ctrl:ISO IN cbf invoked with "transfer->transferSofar" always 0

belmontbob59 — Tue, 19 Mar 2019 18:28:55 GMT

There is a bug for the SDK for host controller ISO IN transfer. The USB stack invokes the transfer callback with parameter “transferSofar” equals to 0 for payload length > 0 at transport. So there is no way from the cbf's perspective to determine how many bytes the device actually sent.

Please see attached device enumeration. I hooked up KEIL debugger to inspect the transfer parameter upon call back. I armed an ISO in transfer for 96 bytes. Upon call back, the buffer the transfer points to (transfer->transferBuffer = 0x2000321B) actually contains the data the device sent (please compare to USB analyzer actual data) but transfer->transferSoFar is 0. It should be 88 instead.

Please note that this issue does not occur with Interrupt-IN transfer.

attached USB trace : AcquisitionFile0000.ufo. (please use Ellysis free viewer to inspect the trace)

1)ISO in at transport (snapshot from USB trace)

2)transfer cbf inspection

2.a) transfer structure

2.b) transfer buffer

-> The USB stack actually received the data from the device but "TransferSoFar" is 0 instead of 88 so the cbf can not determine how many bytes were actually received.

Please advise.

Re: SDK 2.5.0:USB0 host ctrl:ISO IN cbf invoked with "transfer->transferSofar" always 0

FelipeGarcia — Mon, 25 Mar 2019 18:34:44 GMT

Hi Bob,

First of all let me apologize for the late reply.

Thanks a lot for your feedback. Could you please let me know the specific SDK project you are working on so I can report this issues?

Best regards,

Felipe

Re: SDK 2.5.0:USB0 host ctrl:ISO IN cbf invoked with "transfer->transferSofar" always 0

belmontbob59 — Mon, 25 Mar 2019 19:33:47 GMT

SDK 2.5.0. I can not give you any specific project because there is no ISO-IN example available in the SDK as far as I know.

Re: SDK 2.5.0:USB0 host ctrl:ISO IN cbf invoked with "transfer->transferSofar" always 0

belmontbob59 — Wed, 03 Apr 2019 21:55:49 GMT

Any update on this matter?

Re: SDK 2.5.0:USB0 host ctrl:ISO IN cbf invoked with "transfer->transferSofar" always 0

FelipeGarcia — Fri, 05 Apr 2019 22:05:56 GMT

Hi Bob,

I have sent your comments to the USB team. Thanks again for reporting this issues.

Regards,

Felipe