Hi,

I bought the RS485 Cap and i'm trying to use it correctly.

The connection is set to the UART 2 with the switch. ( rx and tx )

i correctly set the pin mux to enable the uart 2:

echo 21 > /sys/kernel/debug/omap_mux/spi0_sclk
echo 1 > /sys/kernel/debug/omap_mux/spi0_d0


In my code, i'm able to open the connection, but not to initiate it :


    int fd = open ("/dev/ttyO2", O_RDWR);
    if (fd < 0) {
        printf("error\n");
        /* Error handling. See errno. */
    }
    // it works
    struct serial_rs485 rs485conf;

    rs485conf.flags |= SER_RS485_ENABLED;
    rs485conf.delay_rts_before_send = 0x00000004;
    int test = ioctl(fd, TIOCSRS485, &rs485conf);
    if(test<0){
        test=0;
       /// i'm stuck here .........
    }else{
        test=1;
    }


Would you like to explain me what is wrong with me ?

Thx you very much,