SPRUJB6B November 2024 – May 2025 AM2612
The PRU-ICSS UART0 can be placed in the diagnostic mode using the [4]LOOP bit in the modem control register - UART_MCTR, which internally connects the PRU-ICSS UART0 output back to the PRU-ICSS UART0's input. In this mode, the transmit and receive data paths, the transmitter and receiver interrupts, and the modem control interrupts can be verified without connecting to another UART.