To write a driver for lwIP you need to read and understand the code in
the src/netif section. The file ethernetif.c is a skeleton for what you
have to provide to lwIP.
Check the wiki at wikia:
http://lwip.wikia.com/wiki/Writing_a_device_driver
Your input function depends on whether you use an RTOS or not.
All your Renesas' blue's belong to the Renesas forums. You might find
someone here knowing your hardware, or you might not. You will find
someone there.
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