Touch display expansion board: 1. Four buttons for setting operations 2. A rotary potentiometer for adjusting parameters 3. 320x240 color 16-bit TFT display, using SPI interface 4. Resistive screen touch sensor, using ADS7846 chip, SPI interface. 5.1-channel USB OTG interface, used to expand storage or input and other functions. In order to save IO, use the screen and ADS to share the SPI interface to control display and operation.
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