这个问题解决了吗，我现在也是遇到这种情况

I see, thanks for additional information. You can also try to play with `input_delay_ns` SPI configuration parameter. It helped me to make SPI work at higher frequencies. Please also make sure you have proper SPI signal routing in your PCB design. I got the esp32s3-devkitc-v1, have same question in...

I have not tested with iperf. For the problem above, I have found out the cause, it is due to the CS setup timing to small when running the spi clock at 40MHz. After I set the clock back to 20MHz, it works fine. Since DM9051 support 100Mbps, and it can run at 50MHz clock, I want the spi bus speed t...