Re: [ECOS] how to disable diag_printf output on serial port

[Sergei Gavrikov <sergei dot gavrikov at gmail dot com>]

On Sun, 6 Jun 2010, Alex Lindeijer wrote:
> Hi all
> We have an ROMRAM application that is started by the redboot start-up
> script. That uses diag_printf in the kernel (like in the TSEC/PHY eth
> drivers, even without DEBUG define etc). When compiled as RELEASE I
> don't want output on the serial port. I actually want to use it for
> something else.
> I tried disabling the TTY and HAL/diag serial driver in the config
> tool but without luck. I set the  ISO C library/default console device
> to /dev/null. I also tried to set TTY-mode serial device driver to
> /dev/null without luck.Even disabling the TTY drivers all together. We
> are not using Redboot as a ROM monitor. Might Redboot be used for
> diag_print...?
>
> Also when enabling the Hardware serial driver for /dev/ser1(same port
> as diag_printf uses now) my app crashes in cyg_io_read. We already use
> /dev/ser2 which works fine.
>
> So any hint to where the conflict might be? Thanks in advance

Hi Alex,

Your needs were discussed many times on the list. This famous chapter
from eCos reference manual explains what you would fix to manage your
"issue": http://ecos.sourceware.org/docs-latest/ref/hal-calling-if.html

So, keywords are: HAL_DIAG_INIT, HAL_WRITE_CHAR, HAL_READ_CHAR. To get
what diag_printf() is, refer, please, to infra/<version>/src/diag.cxx.

The eCos *diagnostic* I/O does not use Serial I/O driver. It uses a
simple polling mode for its I/O routines. It makes no sense to change
serial driver options if you try to manage diag_printf().

If you don't desire to circumvent VV interface, you can add some AUX
COMM in your HAL (for example, it would be LCD display, or even a
circular buffer in RAM) and use it as a console comm channel. Well,
hal/common: hal_if.[ch] sources will explain all needed for you.

Sergei

> Alex Lindeijer | 3D perception AS
> Senior System Designer

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