Hello everyone,
I ran into a problem while implementing the LwIP stack v1.3.2 onto the
STM32F4 Evalboard.
My Intention is to build a bootloader application while using Raw API. I
want to transmit the .bin file in Parts of 64kB (matching the CCM) to
the microcontroller, put it into the CCM and after that is filled or all
data is transmitted to write the data into the FLASH. As long the file
to transfer is smaller than this magical 29200 Bytes every thing works
fine, but if it exceeds that limit the TCP connection freezes after
transmitting the 29200Bytes. Wireshark didn't see any messages following
that freeze not even a keep alive message. If i stop my terminal program
that is sending the data the frame for closing the connection is send
and answered. To control the data transmission i have a second tcp
connection to another port where i am sending control instructions like
how many bytes to expect. The acknowledgements to these frames had
somehow a decreasing window size.
That happens as follows: //
1. frame window is 2920
2. receive frame length 13
3. ack frame window 2907
Is there a mistake in interfacing the lwIP stack? The windowsize
update function is disabled.
I took the driver as well as the interface out of the ethernet example
for STM32F4Evalboar + STM32F4DIS-BB from element 14.
i would be grateful for any hint.
sincerly,
Norbert
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