foundry27 : Post

Forum Topic - devc-serusb data loss issue: (2 Items)

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Sylvain Barge(deleted)

03/24/2015 5:45 AM

post113590

Hi,

When using CDC-ACM ports to communicate between modem device and Nvidia Tegra AP running qnx 6.6, dev-serusb process is 
losing data packets sent by the modem. 
We've probe the usb link with a usb serial analyser, and we see that the modem is sending data to the AP, but the data 
retrieved by devc-serusb are not correct. the usb driver acknowledges the data packets from the modem, but it not able 
to retrieve all of them, and to pass them to the devc-serusb process.

The modem data rate on this link is about 6Mbytes/s. Was such an issue observed before? Was devc-serusb ever tested with
 high bit rates?

Thanks for your support,
Sylvain

Malte Mundt

04/01/2015 4:37 AM

post113657

Re: devc-serusb data loss issue

Hi Sylvain,

I'm not sure devc-serusb was ever tested with such high bitrates. I assume it is only meant to be used with bitrates up 
to the highest "native" serial bitrate that is common - 115kbps. But this is just my guess. Have you brought up this 
topic via QNX Support channels? I highly recommend a CSP (Custom Service Plan) contract with QNX, as with that one you 
can request QNX R&D to deliver a driver that operates within whatever parameters you specify (as long as the hardware 
can do it, of course ;-)).

Cheers,

- Malte

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