Although, one should note that both Igor & Charles did that purely in software, while OP's project is using PIO machinery, so it's strictly speaking not the same thing.
Back in 1999 we built a 100% bit-banged software implementation of 10BASE-T including all of the stack up to UDP & TCP. It was a demonstration project to show off the performance of the 50MHz/50MIPS Scenix microcontroller.
By the time it was commercialized in 2001 the PHY had moved into hardware, but the Ethernet MAC functionality was still software.
It is funny to see now that we named the chip IP2022 ... IIRC I don't think we were thinking that it was so futuristic it represented what the year 2022 would look like.
By the time it was commercialized in 2001 the PHY had moved into hardware, but the Ethernet MAC functionality was still software.
https://www.ic72.com/pdf_file/i/428749.pdf
It is funny to see now that we named the chip IP2022 ... IIRC I don't think we were thinking that it was so futuristic it represented what the year 2022 would look like.