[En-Nut-Discussion] Ethernut3.1 RS232 DTR pin

[Paul Govers]

Hi Thiago,

i already tried to set UART_SETSTATUS with UART_DTRENABLED
_ioctl(_fileno(cd.cd_rs232), UART_SETSTATUS, UART_DTRENABLED);
but still RS232 DTR pin 0 volt :-(

i will also take a look in the UART driver, maybe ill find the solution 
there

Greetings
Paul

----- Original Message ----- 
From: "Thiago A. Corrêa" <thiago.correa at gmail.com>
To: "Ethernut User Chat (English)" <en-nut-discussion at egnite.de>
Sent: Thursday, December 17, 2009 1:04 PM
Subject: Re: [En-Nut-Discussion] Ethernut3.1 RS232 DTR pin


> On Thu, Dec 17, 2009 at 6:56 AM, Paul Govers <egnite at paulgovers.com> 
> wrote:
>> Hello Thiago,
>>
>> The ethernut board (http://www.ethernut.de/en/hardware/enut3/index.html) 
>> iam
>> using has a fully wired RS232 connector. i checked the schematics and the
>> DTR pin is connected. i have also tried to connect DTR to the DSR on the
>> RS232 side of my heating system but this does not help. i think that the
>> heating system has not implement the DSR pin/functionality :-(
>
> Ok, I will take a look at the driver to see if I can find it implemented.
>
>> your other suggestion to set the DTR pin, with code that would looks
>> like(where UART_DTR can be a other name)
>> unsigned long on = 1;
>> _ioctl(_fileno(cd.cd_rs232), UART_DTR, &on);
>> is maby the solution, i will try this piece of code
>>
>
> Looked up my code, it is actually:
>
>                long temp = 0;
> temp = UART_DTRENABLED;
> if ( data->settings->flowcontrol != 2 ) // Not RTS/CTS
> temp |= UART_RTSENABLED; // Keep RTS line up just like the PC does.
> _ioctl(_fileno(data->serialPort), UART_SETSTATUS, &temp);
>
> So, the constant you are looking for is UART_DTRENABLED from 
> UART_SETSTATUS.
>
> Kind Regards,
>     Thiago A. Correa
> _______________________________________________
> http://lists.egnite.de/mailman/listinfo/en-nut-discussion