[ECOS] RE : [ECOS] RE : [ECOS] Serial link problems

Guillaume Menant g.menant@ayrtontechnology.com
Fri Jan 12 10:59:00 GMT 2007


I've resolved the problem by setting the baudrate to 9600 (a lower one)

Thanks for your support.

Guillaume MENANT

-----Message d'origine-----
De : ecos-discuss-owner@ecos.sourceware.org
[mailto:ecos-discuss-owner@ecos.sourceware.org] De la part de Guillaume
Menant
Envoyé : vendredi 12 janvier 2007 09:58
À : ecos-discuss@sources.redhat.com
Objet : [ECOS] RE : [ECOS] Serial link problems

Thanks for your answer Gary.

I've understand the same thing but isn't it a driver problem? I'm currently
working at 38400 bauds no parity, no handshake 8 databits 1 stopbit. Like
you suggest, I will try at a lower baudrate like 9600 for example.

I will give you some news when I tried this. 

Guillaume MENANT

-----Message d'origine-----
De : ecos-discuss-owner@ecos.sourceware.org
[mailto:ecos-discuss-owner@ecos.sourceware.org] De la part de Gary Thomas
Envoyé : jeudi 11 janvier 2007 12:11
À : Guillaume Menant
Cc : ecos-discuss@sources.redhat.com
Objet : Re: [ECOS] Serial link problems

Guillaume Menant wrote:
> Hello,
> 
> While using RedBoot on AT697 (LEON Sparc V8), I've encountered problems
> using the serial link. It appears that the "_rb_gets_preloaded" function
> miss few characters arriving on the serial link. For example, I send
"help"
> and RedBoot understands "hlp".
> 
> I've tried to send this command with 2 different softwares: 
> 
> - The first one send the 4 ascii characters one after the other followed
by
> the carriage return -> RedBoot don't understand the command every time.
> - The second one sends each character as soon as the user hit a key on the
> keyboard (it's hyperterminal, included in windows XP) -> RedBoot
understand
> the command every time.
> 
> What can I do to resolve this problem? Obviously, it comes from the serial
> driver included in RedBoot (in io.c), but what kind of modification have I
> to do to prevent it?

What you're seeing is a serial overflow, caused when characters
come into RedBoot too quickly.  Your first case, all four characters
will be sent back to back, in the second, they'll only be sent as
fast as the person typing them.

Either run at a slower baud rate, or go with the one-character-at-a-time
style of input.

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

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