Hi Marinkovic, The first argument to UART_open() is suppose to be an index into the UART's HWAttrs table. The HWAttrs table may list more than one UARTs and the index tells UART_open() which one you want to open. The UART's HWAttrs table is defined in the board.c file. I have shown a screenshot of this structure below: Since you are new to TI-RTOS, I would recommend starting with an existing UART example. TI-RTOS ships with 3 UART examples - UART Console, UART Echo and UART Logging. You can import one of these through TI Resource Explorer in CCS. Best, Ashish
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