14.3.2.3 Use Model 3: I²C Loopback Mode

I2C_0 and I2C_1 are internally connected in Loopback mode, as shown in the following figure. The MSS_I2CLOOPBACK bit of the LOOPBACK_CR System register is used to enable the Loopback mode.

Following are the steps to configure I2C_0 and I2C_1 in Loopback mode to verify the data transfer between I²C peripherals.

• Enable the I2C_0 and I2C_1 in the MSS configurator of the Libero SoC design project.
• Initialize I2C_0 and I2C_1 in the SoftConsole application.
• Set the MSS_I2CLOOPBACK bit of the LOOPBACK_CR System register in the SoftConsole application. For further details, see 14 Inter-Integrated Circuit Peripherals.
• Use I²C read and write APIs from the MSS I²C driver to send and receive the data. While using APIs from the MSS I²C driver, ensure that either I2C_0 or I2C_1 is in Master mode.
• The data traffic from I2C_0 is looped back to I2C_1, and vice versa.