Set serial stop bit count on Two in Windows 10 iot with RPi3 UART

Question

I want to parameter my serial settings with 2 bit stop (in a UWP app) on a Raspberry Pi 3 to control a DMX512. My app is working and it works with a external FTDI, but not with the UART from the Raspberry Pi... I get a "parameter is incorrect" error when it execute the line with the stop bit parameter.

        _serialPort->WriteTimeout = _timeOut;
        _serialPort->ReadTimeout = _timeOut;
        _serialPort->BaudRate = 250000;
        _serialPort->Parity = Windows::Devices::SerialCommunication::SerialParity::None;
        _serialPort->DataBits = 8;
        _serialPort->StopBits = Windows::Devices::SerialCommunication::SerialStopBitCount::Two;
        _serialPort->Handshake = Windows::Devices::SerialCommunication::SerialHandshake::None;

With Linux, I know that the UART of RPi3 supports 2 stop bits.

Someone has a solution or it's just because of Windows IOT ?

Thanks.

Every UART supports 2 stop bits. The BaudRate is surely the real problem, 250000 is highly non-standard. Start first at 9600. — Hans Passant, Jun 24 '16 at 17:38
Nope, even at 9600 it doesn't work, it's only the parity which cause the error. — extazoië, Jun 27 '16 at 07:37

score 1 · Answer 1 · edited Apr 13 '17 at 12:56

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The exposed UART on the RPi3 doesn't support 2 stop bits, only 1 stop bit. Take a look at this answer for citation and more details about the capabilities of the exposed UART.

edited Apr 13 '17 at 12:56

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answered Jul 03 '16 at 03:48

Fls'Zen

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Set serial stop bit count on Two in Windows 10 iot with RPi3 UART

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