w5500 arduino comunication problem

Question

Hi I have two w5500 chinese ethernet module. one of them somtimes work and somtimes doesnt work. arduino says ethernet shield was not found. I think it is a spi problem but somtimes works good i thing ethernet module could have spi frequency problem or oscillator problem or cs pin and rst pin pull up. am i right ? how can i test According to Probable problems? I use ethernet.h library

irina · Answer

If you bought a module that we didn’t sell, I can’t say that it can work. Because the schematic is unknown. I think you should check the SPI waveform with an oscilloscope. Please capture the waveform that reads the Mac address and upload it, and I’ll check it with you.