Reversed Payload Bits?

Reversed Payload Bits?

[Remi Philippe]

Hello,
A generic question, have you ever run into issues such as payload bits
arriving reversed (AT86RF215 to CC1200 on Contiki, but I guess it
would be the same for AT86RF230)?

At first look it could have been and endianess problem, but I don't see why...

Thanks,
Remi

Re: Reversed Payload Bits?

[Alexander Aring]

On Sun, Apr 03, 2016 at 10:35:29PM +0400, Remi Philippe wrote:
> Hello,
> A generic question, have you ever run into issues such as payload bits
> arriving reversed (AT86RF215 to CC1200 on Contiki, but I guess it
> would be the same for AT86RF230)?
> 

- which layer? MAC, 6LoWPAN?

- bit or byte ordering?


If you code something and missed byteordering handling you can check it
with:

make C=2 net/ieee802154/ net/mac802154/

this requires the software "sparse".

_But_ this works only if you use correct the byteorder typedefs such as
"__le16", etc...

> At first look it could have been and endianess problem, but I don't see why...
> 

Which contiki version? I tested 2.6 with some self ported board only.
I know versions below had some fragmentation issues, which you not use.

- Alex

Re: Reversed Payload Bits?

[Remi Philippe]

Thanks Alex, will look into your suggestion. It seems it's a bit reversal issue.
Contiki is 3.0 (master)

I just noticed that we were playing with the RPi version which doesn't
integrate most of the patches of bluetooth-next. Will first try to
create a diff between RPi and 802154 related to see if it fixes the
issue.

On Mon, Apr 4, 2016 at 12:04 PM, Alexander Aring <alex.aring@gmail.com> wrote:
> On Sun, Apr 03, 2016 at 10:35:29PM +0400, Remi Philippe wrote:
>> Hello,
>> A generic question, have you ever run into issues such as payload bits
>> arriving reversed (AT86RF215 to CC1200 on Contiki, but I guess it
>> would be the same for AT86RF230)?
>>
>
> - which layer? MAC, 6LoWPAN?
>
> - bit or byte ordering?
>
>
> If you code something and missed byteordering handling you can check it
> with:
>
> make C=2 net/ieee802154/ net/mac802154/
>
> this requires the software "sparse".
>
> _But_ this works only if you use correct the byteorder typedefs such as
> "__le16", etc...
>
>> At first look it could have been and endianess problem, but I don't see why...
>>
>
> Which contiki version? I tested 2.6 with some self ported board only.
> I know versions below had some fragmentation issues, which you not use.
>
> - Alex