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Re: Fwd: Re: Can't read with cyg_io_read()


Can someone acknowledge that the driver "/dev/haldiag" ist only intended for output of traces and is not able to read anything?

I am asking because in documentation there is no explanation of the individual drivers.


-------- Original-Nachricht --------
> Datum: Thu, 14 Feb 2008 15:29:59 +0100
> Von: Gentleman.nbg@gmx.de
> An: ecos-discuss@ecos.sourceware.org
> Betreff: [ECOS] Fwd: Re: [ECOS] Can\'t read with cyg_io_read()

> Hi,
> 
> in debugging mode I found out, that I could not use neither /dev/tty0 nor
> /dev/serial0 driver as my handle. The only working driver is /dev/haldiag/.
> 
> Where can I change the configuration? with ecos configuration tool?
> 
> I am asking because, I am building my eCos image with a makefile and gnu
> make.
> 
> Do you really think that /dev/haldiag/ is not able to read from serial
> port? It can write, so I think it should be able to read too.
> 
> Thank You
> 
> 
> -------- Original-Nachricht --------
> Datum: Wed, 13 Feb 2008 17:48:06 +0100
> Von: Andrew Lunn <andrew@lunn.ch>
> An: Gentleman.nbg@gmx.de
> CC: ecos-discuss@ecos.sourceware.org
> Betreff: Re: [ECOS] Can\'t read with cyg_io_read()
> 
> On Wed, Feb 13, 2008 at 04:07:13PM +0100, Gentleman.nbg@gmx.de wrote:
> > hi eCos fans,
> > 
> > I don't know if it is the apropriate way to ask such things, but I
> haven't found a board for ecos-developers, so I'll make it short:
> > 
> > I am testing the serial communication via eCos api. Writing is not the
> issue, there is a example, and it works.
> > 
> > But I can't read anything from serial device. I connected it to my PC
> where I am tryting to write (with keyboard) some characters via a terminal
> e.g. MS Hyperterminal. I also tried it by sending a "hello" via the Win32
> Serial API. But my controller application waits forever. I am sure that I have
> sent the characters (as I used a serial port scanner).
> > 
> > My eCos example code would look like this:
> > 
> > static void simple_prog(CYG_ADDRESS data)
> > {
> >     cyg_io_handle_t handle;
> >     Cyg_ErrNo err;
> >     
> > 	const char send_string[] = "Hallo";
> > 	cyg_uint32 len = strlen(send_string)+1;
> > 	
> > 	char read_string[6];
> > 	cyg_uint32 len2 = 6;
> > 
> >     
> >     	err = cyg_io_lookup( "/dev/haldiag", &handle );
> 
> You will find it work better if you use /dev/tty0. You will need to
> change you configuration a little, add the interrupt serial device
> driver and the TTY driver.
> 
>        Andrew
> 
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