Re: [lwip-users] UDP and TCP concurrent operation causing fault

[Sylvain Rochet]

Hi,

On Thu, Nov 15, 2018 at 05:59:58PM +0000, Applebee, Robert wrote:
> 
> My application is built with LWIP 1.4.1 running on a TI MCU and uses 
> raw TCP and raw UDP calls, no RTOS.

lwIP 1.4.1 was released 6 years ago…


> This is my main loop that outputs the UDP:
> 
>     // allocate pbuf for UDP
>     p=pbuf_alloc(PBUF_TRANSPORT, 32, PBUF_RAM);
> 
>     //
>     // Loop forever, processing the LED blinking.  All the work is done in
>     // interrupt handlers.

This doesn't seem right, are you sure you are not violating lwIP 
threading/contexts requirements ?

http://www.nongnu.org/lwip/2_1_x/pitfalls.html

RAW API (udp_*, tcp_*, netif_*, …) is not thread nor IRQ safe!!!


>     while(1)
>     {

Where are you calling lwIP timeouts in this loop ?


Sylvain

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