Hello,
TivaWare 2.1.4.178 contains in uart.c an assertion
ASSERT(ui32Base == UART1_BASE);
in all the modem status/control related functions (e.g. UARTModemControlGet() or UARTModemStatusGet()).
But TM4C supports full control lines on UART0 too, and CTS + RTS on UART 2-4..
Is the assertion wrong?