We're loosing serial bytes from PC to phone

Hopsing K hopsingk at gmail.com
Thu Mar 25 11:40:45 UTC 2010


Maybe 0x0 is a hardware processed escape sequence. In that case
you'd have to find the sequence that escapes the escape. Just a idea.
-- K

2010/3/21 Harald Welte <laforge at gnumonks.org>

> Just another intermediate update:
>
> 1) I've pushed my current debugging code to the uart-debug branch
>
>   Simply run osmocon + layer23 and the hello_world.bin image.  layer23
>   will send a 62 byte sized HLDC message every 10 seconds to the phone,
>   and various instances of the code will print what they see.  The
>   payload of the packet is supposed to be
>        0a 00 00 01 02 03 04 05 06 07 00 01 02 03 04 05 06 07
>              00 01 02 03 04 05 06 07 00 01 02 03 04 05 06 07
>              00 01 02 03 04 05 06 07 00 01 02 03 04 05 06 07
>              00 01 02 03 04 05 06 07 00 01 02 03 04 05
>
>   but what the firmware sees is:
>        0a 00       02 03 04 05 06 07       02 03 04 05 06 07
>                    02 03 04 05 06 07       02 03 04 05 06 07
>                    02 03 04 05 06 07       02 03 04 05 06 07
>                    02 03 04 05 06 07       02 03 04 05
>
>   So as you can see, every '00 01' sequence has been chopped out,
>   despite 10ms delays between the characters. If you change the
>   payload to not include zero-bytes, all bytes are received fine.
>
> 2) Enabling various misc UART interrupt sources and checking for error
>   conditions in LSR does not help
>
> Regards,
>        Harald
> --
> - Harald Welte <laforge at gnumonks.org>
> http://laforge.gnumonks.org/
>
> ============================================================================
> "Privacy in residential applications is a desirable marketing option."
>                                                  (ETSI EN 300 175-7 Ch. A6)
>
>
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