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Re: Reading data from ttyS fails

On May 24 14:25, thunderboy42 wrote:
> I have an embedded system connectet with my PC which sends debug data over the
> rs232. A simple terminal program unter cygwin is used to analyze this data.
> before cygwin 1.7.10 evertything went fine, but now it seems, most transmitted
> characters get lost. even this simple example from wikibooks does not work
> anymore:
>         ...
>         memset(&tio,0,sizeof(tio));
>         tio.c_iflag=0;
>         tio.c_oflag=0;
>         tio.c_cflag=CS8|CREAD|CLOCAL;  
>         tio.c_lflag=0;
>         tio.c_cc[VMIN]=1;
>         tio.c_cc[VTIME]=5;
>         tty_fd=open("/dev/ttyS0", O_RDWR | O_NONBLOCK);
>         cfsetospeed(&tio,B115200);            // 115200 baud
>         cfsetispeed(&tio,B115200);            // 115200 baud
>         tcsetattr(tty_fd,TCSANOW,&tio);
>         while (c!='q')
>         {
>                 if (read(tty_fd,&c,1)>0)        write(STDOUT_FILENO,&c,1);
>         }
>         ...
> So what can I do?

Can you please create a simple testcase for reading from ttyS0
which can be compiled out of the box?


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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