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Re: [Fwd: AT91SAM7S : cyg_io_write /dev/ser0]
- From: Andrew Lunn <andrew at lunn dot ch>
- To: eCos discussion <ecos-discuss at ecos dot sourceware dot org>
- Date: Thu, 6 Sep 2007 20:02:30 +0200
- Subject: Re: [ECOS] [Fwd: AT91SAM7S : cyg_io_write /dev/ser0]
- References: <46E03E6E.1080409@jifvik.org>
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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