[ECOS] Echo on tty/serial...

Andrew Lunn andrew@lunn.ch
Fri Sep 23 10:11:00 GMT 2005

On Thu, Sep 22, 2005 at 05:38:10PM +0200, Stefan Sommerfeld wrote:
> Hi,
> I want to use the serial port from my eCos application. I tried to use 
> /dev/ttydiag, but i cannot disable the echo to the output. Every 
> cyg_io_read() causes the echo even if i disable it using tty_out_flags = 
> CYG_TTY_OUT_FLAGS_CRLF and tty_in_flags = 0. An important thing to know is, 
> that i'm using posix. Printf works flawless.
> Is there another serial device which i could use (and have to enable for my 
> ecos)? How could it work if i also use printf?

Yes, use the "proper" serial driver. /dev/ttydiag is intended for
diagnostic output and is very simple. It does not support the various
flags needed to disable echos etc. 

Enabling CYGPKG_IO_SERIAL_DEVICES will cause the interrupt driver
serial driver to be built. This then provides /dev/ser?. You will want
to layer on top of that the tty driver. So enable
/dev/tty0. You can then use the yg_io_set_config() calls as described
If you want to use termio you need to add the termio driver to the
stack in the same way.


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