How to use spi communication with rak3172

Hi guy. I want to use SPI communication with rak3172 but don’t see the documentation talking about it. I hope there is an example of SPI with rak3172 on the Arduino IDE.
P/S: I want to use rak3172 to display E-Ink. To connect it requires SPI

Welcome to the forum @Xuanminh
You use SPI the same way you would use it from an Arduino sketch.
The SPI functions are listed in our RUI3 API Documentation

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