First, create an instance of the library for your touchscreen. The digital pin used for chip select is required. The normal MISO, MOSI and SCK pins will be used automatically. #define CS_PIN 8 XPT2046 ...

I2C protocol in principal can have two masters on the same bus, but this is not a practical or a good practice as the master creates the clock on the databus (SCL) which the data (SDA) is transferred ...