LPC546xx LWIP and Hardware Checksum

florentfortin — Fri, 22 Jan 2021 14:49:19 GMT

Hello
We are using LPC546xx Microcontroler

To Maximizing throughput on the processor, I would like to activate the option "CHECKSUM_BY_HARDWARE"

As proposed here:
https://lwip.fandom.com/wiki/Maximizing_throughput

Do you know what must be done on Ethernet Controler Part ?
I see In the User Manual:

IP checksum offload support for TCP, UDP, or ICMP payloads encapsulated over IP

So, I activated the bit 27 "IPC" of MAC_CONFIG

but as soon activated the Ethernet communication is not working any more

Re: LPC546xx LWIP and Hardware Checksum

xiangjun_rong — Sun, 07 Feb 2021 09:03:55 GMT

Hi, Florent,

I think you have to set the COE bits in the MAC HW Feature0 register, I copy it here:

Pls check the IPS bit for the IP part checksum.

Hope it can help you

XiangJun Rong