[lwip-devel] [bug #42633] Write many frames at high speed to a PC stops communication random.

[Bart Houkes]

Follow-up Comment #6, bug #42633 (project lwip):

Dear friends,

BUG analysed. Thanks for helping out! 
ISSUE: Checksum is wrong calculated sometimes. This part of code was also
changed, because TI DSP's have a strange architecture with 16 bits per byte. 

Reentrancy was not the issue, since I lock the core during writing. DMA is no
issue, because I read data without DMA. 

                LOCK_TCPIP_CORE();
                err = tcp_write( tpcb, ptr, length, flags);
                if ( err ==ERR_OK)
                {
                        tcp_output( tpcb);
                }
                UNLOCK_TCPIP_CORE();

Today I have to solve the checksum issue!!

I didn't find this earlier, because Wireshark disables the checksum
validation. ONLY after I switch it on, I found the issue. I would always check
the checksum in Wireshark, since it is only for 20 bytes. :-)

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