UART Core with CTS/RTS

use a terminal program (e.g. BRAY's TERMINAL) where you can switch on/off

RTS and where you can see the state of CTS.

see file altera_avalon_uart_regs.h

you can check CTS at nios side with...

uartstatus=IORD_ALTERA_AVALON_UART_STATUS(UART_1_BASE);

if(uartstatus&ALTERA_AVALON_UART_STATUS_CTS_MSK) {

... // cts is set (low)

}

you can set RTS with ...

ctrl=IORD_ALTERA_AVALON_UART_CONTROL(UART_1_BASE);

ctrl|=ALTERA_AVALON_UART_CONTROL_RTS_MSK;

// ctrl&=~ALTERA_AVALON_UART_CONTROL_RTS_MSK; // to clear

IOWR_ALTERA_AVALON_UART_CONTROL(UART_1_BASE,ctrl)

if CTS is not set, the fast driver will not send any byte,

RTS is ignored by the driver, you have to handle it by yourself.