Re: cc2520 issue

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Hi Karol Poczesny,

On 05/12/2015 03:24 AM, Karol Poczesny wrote:

> Hello all,
>
> I have tested simple ping communication between two devices:
> 1.) Raspberry Pi with at86rf233 transceiver - (openlab module)
> and
> 2.) Raspberry Pi with CC2520 transceiver - my own radio board.

I used BeagleBoneBlack with cc2520. It worked for me. Able to communicate
with TinyOS nodes.

> I am able to run the interface and start transmit frames for both nodes,
> but only node with at86rf233 respond.
>
> Node with CC2520 can send e.g ping message but cannot answer for ping from
> at86rf233 node and ignore any other requests.
>
> I had checked my radio board - I complied my system with debug in cc2520.c
> and received this:
>
> ...
> [ 661.896458] cc2520 spi32766.0: SFD for RX
> [ 937.179079] cc2520 spi32766.0: SFD for RX

It will just a debug message that will indicate a packet has received. After a packet
has received cc2520 will generate SFD interrupt. 

> so - I received SFD interrupt for RX this function is processed and it
> seems that received packet stuck somewhere on Rx path.

Can you please enable the debug for mac802154 and see whether the packet is going
to the upper layers or not..?

> I'm going to track this anomaly but maybe someone had similar problem.
> Maybe there are some issues related with configuration cc2520 + RPi?
> Somebody tested this configuration ?
>
> I use pretty old kernel version (3.17.0-rc1+) and old userspace tool - iz
> on both sides. Configuration is this same as on openlab web.

Use the latest bluetooth-next [0] tree. And this iz tools are now deprecated
with the new kernel versions. Use the iwpan [1] tools (similar to iw for wireless). 

> Solution is described on my blog:
> [0] http://zanaster.blogspot.com/2015/05/rpi-6lowpan-solution-with-cc2520.html

Nice. 

> Best,
> Karol
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Thanks,

-- 
Varka Bhadram

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