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Re: at91 SPI in CS mode with 'PDC'
- From: Andrew Lunn <andrew at lunn dot ch>
- To: qiulinyuan <qlytianya at hotmail dot com>
- Cc: ecos-discuss at ecos dot sourceware dot org
- Date: Thu, 16 Sep 2010 15:23:28 +0200
- Subject: Re: [ECOS] at91 SPI in CS mode with 'PDC'
- References: <SNT137-w23EEC8B618309269145E57A17A0@phx.gbl>
On Thu, Sep 16, 2010 at 09:14:26PM +0800, qiulinyuan wrote:
>
> Hello, In the ecos at91 spi device driver,the chip select pin of SPI is configured in GPIO mode.
This is done because of silicon bugs in some AT91 devices. The
incorrect select pin is used when the SPI core drives the pin. Hence
the use of GPIO, which is always right.
Check the Errata for the device you are using. See if it also has the
silicon bug.
Andrew
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