SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7
The I2C modules can be placed into an internal-loopback mode for diagnostic or debug work by setting the I2C Master Configuration register (I2C:MCR) LPBK bit. In loopback mode, the SDA and SCL signals from the master and slave modules are tied together.