Hello,
I am trying to get UDP (transmitting and receiving) with lwIP working on an S32K344EVB-S172 project of mine. I can successfully transmit and receive UDP packets (through port 7, the echo port) in the NXP-provided lwIP example (lwip_s32k344), along with pinging. However, I am entirely unable to get any traffic whatsoever (even an ARP) in my own project (not the example project).
The configuration of all the relevant clocks, pins, and peripherals (tcipip_stack, GMAC, MCU, PIT, etc.) are pretty much identical. The same goes for the code — I copied the initialization code from the example verbatim.
Since I wasn't able to get it to work in my project, I figured I'd make a separate, minimal reproducible example project from the ground up which has the same setup and also doesn't work. See the attached project (UDP_Ground_Up.zip).
Here are some things which I've observed in the non-working project:
- The EMAC TX counters are incrementing
- The PHY registers (read over MDIO) are identical to the working example (including the LINK UP one)
- The EMAC RX counters are not incrementing despite pinging the board's IP
- Nothing (at all) shows up on WireShark
- Debugging into the SDK and lwIP code doesn't reveal any kind of errors happening
I've also attached all my version information in case it is relevant (see ver_info.txt).
Thank you,
Elliot.
