Hi Clemens, On Wed, Jan 4, 2017 at 2:00 PM, Clemens Gruber <clemens.gruber@xxxxxxxxxxxx> wrote: > Hi, > > I observed odd behavior of the current tty/serial/imx.c driver in RS-485 > mode. > > RX works fine, but TX does not: When sending data, it arrives multiple I am also trying to get rs485 in half-duplex mode to work on mx6dl with kernel 4.9. RX also works for me, but TX does not. On my board it is the MX6QDL_PAD_CSI0_DAT16__UART4_RTS_B pin that controls the rs485 transceiver flow, but I do not see RTS to toggle to 1 during transmit. It stays always at 0. I see you use CTS pin instead, but I thought RTS pin should be used. On my userspace application I have: /* enable RS485 mode: */ rs485conf.flags |= SER_RS485_ENABLED; /* set logical level for RTS pin equal to 1 when sending: */ rs485conf.flags |= SER_RS485_RTS_ON_SEND; /* set logical level for RTS pin equal to 0 after sending: */ rs485conf.flags &= ~(SER_RS485_RTS_AFTER_SEND); Any ideas as to how to make RTS go to one so that the data can go through the rs485 transceiver? Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
