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另外这个也不错:
https://github.com/kodera2t/ESP32_OLED_LAN8720_sample
Sample code for "ESP32 Monster board" with LAN8720 and SH1106 OLED display details can be found at https://www.tindie.com/products/microwavemont/esp32-monster-board-ether-can-oled-all-in-one/
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