[Xenomai-help] error after timeout on serial port

[Xenomai-help] error after timeout on serial port

[Lauener Nathan]

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Hi,

I am polling on a serial port during an init sequence of a positioning
device. Every once in a while I get a return code indicating that a
timeout occured, code -110 (ETIMEDOUT). After a timeout occured I can't
read the port anymore. Whenever I call rt_dev_read() again the function
returns the error code -14 (EFAULT). Is there a flag I must clear to get
the port operatioanl again?

Regards
Nathan   



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Re: [Xenomai-help] error after timeout on serial port

[Jan Kiszka]

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Lauener Nathan wrote:
> Hi,
> 
> I am polling on a serial port during an init sequence of a positioning
> device. Every once in a while I get a return code indicating that a
> timeout occured, code -110 (ETIMEDOUT). After a timeout occured I can't
> read the port anymore. Whenever I call rt_dev_read() again the function
> returns the error code -14 (EFAULT). Is there a flag I must clear to get
> the port operatioanl again?

I /tend/ to say it's an application bug, because we are using the driver
heavily, and our sluggish devices often cause timeouts during setup.
Some colleague should have already slapped me otherwise. :)

Are you sure that a valid buffer and a valid size is passed to
rt_dev_read after the timeout (because those should be the reason for
EFAULT)? If yes, maybe you can post a simple demo for the effect.

Jan


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AW: [Xenomai-help] error after timeout on serial port

[Lauener Nathan]

Hi Jan,

Thank you for your advice. After receiving a timeout I didn't set the size again before calling rt_dev_read(). It now works smoothly. Thanks again.

Nathan  

-----Ursprüngliche Nachricht-----
Von: jan.kiszka@domain.hid [mailto:jan.kiszka@domain.hid
Gesendet: Freitag, 23. Februar 2007 15:52
An: Lauener Nathan
Cc: xenomai@xenomai.org
Betreff: Re: [Xenomai-help] error after timeout on serial port

Lauener Nathan wrote:
> Hi,
> 
> I am polling on a serial port during an init sequence of a positioning 
> device. Every once in a while I get a return code indicating that a 
> timeout occured, code -110 (ETIMEDOUT). After a timeout occured I 
> can't read the port anymore. Whenever I call rt_dev_read() again the 
> function returns the error code -14 (EFAULT). Is there a flag I must 
> clear to get the port operatioanl again?

I /tend/ to say it's an application bug, because we are using the driver heavily, and our sluggish devices often cause timeouts during setup.
Some colleague should have already slapped me otherwise. :)

Are you sure that a valid buffer and a valid size is passed to rt_dev_read after the timeout (because those should be the reason for EFAULT)? If yes, maybe you can post a simple demo for the effect.

Jan