Re: [lwip-users] Need help with tcp-raw-api app. Wrong checksum sometimes calculatet ....THX !!!

[Simon Goldschmidt]

Steffen wrote:
> Thx for your fast answeres ! I don't use an operating system, so i don't 
> have threads.  The target is a PowerPc MPC5567. I call the 
> "SendDiagnoseMessage()" function, when results from another Bussystem 
> are available.
> My ETH Controller is in Interrupt mode ! When calling the 
> "SendDiagnoseMessage()" function,it is possible i get interrupted by the 
> receive Interrupt of the ETH controller,
>  (I told you that the wrong checksum only occurs, when a paket is 
> received 1ms bevor i send with"SendDiagnoseMessage()"). I think normaly 
> this should be no problem because the receive function allocates a new 
> pbuf  which is another than the send pbuf.

Do you only allocate a pbuf in interrupt context or do you also pass this pbuf 
into the stack? With interrupt context, it's the same as multithreading: it's 
not supported. Instead, put the received pbuf on a list and process this list 
in the main application context.

Simon
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