Function ser_set_dtr

src/serial.c:1173–1224

* \brief Set Data Terminal Ready (DTR) bit * \param p * \param state true/false * \return RIG_OK or < 0 */

 * \return RIG_OK or < 0
 */
int HAMLIB_API ser_set_dtr(hamlib_port_t *p, int state)
{
    unsigned int y = TIOCM_DTR;
    int rc;

    rig_debug(RIG_DEBUG_VERBOSE, "%s: DTR=%d\n", __func__, state);

    // silently ignore on microHam RADIO channel,
    // but (un)set ptt on microHam PTT channel.
    if (p->fd == uh_radio_fd)
    {
        return (RIG_OK);
    }

    if (p->fd == uh_ptt_fd)
    {
        uh_set_ptt(state);
        return (RIG_OK);
    }

#if defined(TIOCMBIS) && defined(TIOCMBIC)
    rc = IOCTL(p->fd, state ? TIOCMBIS : TIOCMBIC, &y);
#else
    rc = IOCTL(p->fd, TIOCMGET, &y);

    if (rc >= 0)
    {
        if (state)
        {
            y |= TIOCM_DTR;
        }
        else
        {
            y &= ~TIOCM_DTR;
        }

        rc = IOCTL(p->fd, TIOCMSET, &y);
    }

#endif

    if (rc < 0)
    {
        rig_debug(RIG_DEBUG_ERR,
                  "%s: Cannot change DTR - %s\n",
                  __func__,
                  strerror(errno));
        return (-RIG_EIO);
    }

    return (RIG_OK);
}


/**