I’m using an official WIZ850io module connected to an M4 MCU (via SPI).
After properly hard-resetting the w5500 via the RST pin (low@1ms, high then wait 400ms) and initializing the chip with
wizchip_init(), I’m not receiving any reply to any well-formed SPI frame.
I connected a digital analyzer to check the correctness of the SPI frames being sent to the w5500, and they did result to be correct as per the w5500 datasheet. As an example, the following sampling of a
ctlnetwork(CN_GET_NETINFO...) command (right after a
ctlnetwork(CN_SET_NETINFO,...) command with valid data - not all 0xFFs), shows that the w5500 is not responding (all 0xFFs):
The module is properly powered @3.3V (from the same MCU power lines) and correctly connected to the MCU’s SPI. It has a loopback plug inserted in the RJ45 connector, which is correctly triggering the ‘Link’ LED on the ethernet connector.
I have 3 of these modules, and all of them behave the same (i.e. unlikely that all are failing).
What could be the issue?
Thanks for any hint.