W6100 stuck in wizphy_getphylink(). Not Linking

Question

I wrote firmware for a custom board I was making and tested it on a W6100-EVB-Pico and everything worked fine. Then I received my custom board and changed PICO_BOARD from "pico" to "none" in the top level CMakeLists.txt. Upon debugging (Cortex-Debug) I found my device gets stuck in this while-loop in w6x00_spi.c (inside function wizchip_initialize(void)): /* Check PHY link status */ do { if (ctlwizchip(CW_GET_PHYLINK, (void *)&temp) == -1) { printf(" Unknown PHY link status
"); return; } } while (temp == PHY_LINK_OFF); When stepping through this part of the code on the W6100-EVB-Pico hardware, it loops once then exits the loop (as is expected). With the custom board, the reason it seems to get stuck is that temp does not change from 0 (equivalent to PHY_LINK_OFF). The io6Library docs tell us that since ctlwizchip is returning 0 that indicates "success". The error code block is not triggered because no error code is triggered. What am I missing here? My team and I have ruled out all possible hardware issues we could think of. I know the problem is not from custom code because I have used the RP2040-v6-HAT-C example code in my most recent exploration. We are using the W6100 on a custom board with an RP2040 and an RJ45. I can provide more information if needed.

TheoIm · Answer

You mentioned that the issue occurred after changing PICO_BOARD from "pico" to "none". If you are using the RP2040, I don't see why you would need to change it to "none". Or is the firmware you are using your own custom firmware? It is important to check the following: Whether pico_sdk_init() is being called correctly. Whether the board configuration is properly applied when PICO_BOARD=none is set. Whether there are any issues with SPI and GPIO pin mappings that differ from expectations. From what I see, it seems that an incorrect GPIO configuration is preventing the device from receiving the link signal. If you share your CMakeLists.txt file, I can analyze it in more detail. Regards,