[ECOS] [Fwd: AT91SAM7S : cyg_io_write /dev/ser0]

Andrew Lunn andrew@lunn.ch
Thu Sep 6 18:02:00 GMT 2007


On Thu, Sep 06, 2007 at 06:52:46PM +0100, Jonathan Larmour wrote:
> The attached mail was misaddressed....

> From: jc.caquet@kerlink.fr
> To: ecos-discuss-owner@ecos.sourceware.org
> Subject: AT91SAM7S : cyg_io_write /dev/ser0
> Date: Thu, 6 Sep 2007 18:58:50 +0200
> X-Spam-Status: No, score=4.3 required=5.0 tests=AWL,BAYES_99,
> 	MSGID_FROM_MTA_ID,NO_REAL_NAME autolearn=no version=3.0.4
> 
> Dear all,
> we use cyg_io_write on a serial device of AT91SAM7S board and when we try to
> send only 1 character cyg_io_write fails and returns -1 as a result code.
> Everything is OK as soon as we send more than 1 character, every character
> is always successfully output.
> Did anybody already face this problem??

AT91 is one of the two drivers which make use the block transfers in
the serial layer. So maybe you are seeing a bug in this code?

comment out the 

implements    CYGINT_IO_SERIAL_BLOCK_TRANSFER

in arm/at91/current/cdl/ser_arm_at91.cdl

and then do an 

ecosconfig tree ; make ;

so that it does not to block transfers. Do you still get the same
problem?

        Andrew

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