Re: [lwip-users] lwIP hangs after some data transferred

[Grzegorz Niemirowski]

Grzegorz Niemirowski <address@hidden> napisał(a):
> Further analysis gave following observations:
> - thread blocks on fetch because packets are no longer inserted into mbox
> - packets are not inserted because the ETH interrupt is no longer raised
> - there is no interrupt because reception is suspended, set bits in the 
> DMASR register show:
> RPS bits: 100: Suspended: Receive descriptor unavailable
> RBUS bit: Receive buffer unavailable status
> Descriptors are freed inside low_level_input after PBUF has been
> allocated and incoming packet has been copied. But it happens that
> pbuf_alloc returns NULL. What could be the reason? The traffic is not
> big, just a few kB/s. Maybe there is not enough space for PBUFs, but
> the problem doesn't occur immediately, usually a few thousand packets
> are transmitted without any issue before the stack stalls.

I've finally found the solution. I had SYS_LIGHTWEIGHT_PROT defined as 0. 
After defining the macro as 1 the stack became stable.

Grzegorz Niemirowski