21.5.22 Loopback Control Register

Table 21-28. LOOPBACK_CR
Bit Number Name Reset Value Description
[31:4] Reserved 0
3 MSS_GPIOLOOPBACK 0 Controls whether internal loopback on the MSS GPIO is enabled. Allowed values:

0: No internal loopback

1: MSS GPIO outputs are looped back to MSS GPIO inputs
2 MSS_I2CLOOPBACK 0 Controls whether internal loopback between I2C_0 and I2C_1 is enabled. Allowed values:

0: No internal loopback

1: Traffic from I2C_0 is looped back to I2C_ and vice versa
1 MSS_SPILOOPBACK 0 Controls whether internal loopback between SPI_0 and SPI_1 is enabled. Allowed values:

0: No loopback

1: SPI_0 Tx is looped back to SPI_1 Rx. SPI_1 Tx is looped back to SPI_0 Rx
0 MSS_MMUARTLOOPBACK 0 0: No loopback between MMUART_0 and MMUART_1

1: MMUART_0 Tx is looped back to MMUART_1 Rx MMUART_1 Tx is looped back to MMUART_0 Rx
Note: Do not change these register fields dynamically for 005 and 010 devices, see 21.5.1 System Registers Behavior for M2S005/010 Devices.