Debugging Issues with W5500/LAN8720 Communication with STM32 and Gigabit Switch Chips
The premise is that the hardware circuit is basically designed according to the official recommendations, and the software is also ported from the official demo. 1. First, check if the crystal oscillator is oscillating. The oscilloscope should show a DC bias of about 1.5V and an AC amplitude of approximately 0.5V with a 25MHz oscillation … Read more