>-----Original Message-----
>Cc: [email protected]
>Subject: Re: [spi-devel-general] Status of Linux SPI slave
>
>Roger Frøysaa wrote:
>> Hi.
>>
>
>For example, I have an SPI master device that streams data to a Linux
>processor at 11Mbit/sec, but never expects any response from the
>processor; this data is written over the 100baseT network to an NFS
>file system at an effective 5GBytes/hour. To make it work, I have
>heavily modified the pxa2xx-spi driver for the target Gumstix system so
>that it can accept data driven by an external clock, and so that it uses
>a queue of DMA descriptors to prevent interrupt latency from limiting
>service of the receive FIFO. I did not have to modify a single line of
>code anywhere else in the SPI framework. All other parts of the SPI
>framework, as well as my protocol driver and user-space code, still
>operate as if they were part of an SPI master; they just keep full a
>queue of SPI messages that request buffers to be filled by SPI reads.
>Basically, this is a VERY limited slave function, where the Linux system
>is not in control of the timing, but also there is never any sort of
>query/response between the master and slave.
Well, now I get the minimal use of slave side transfer. As David suggested
of having spi_slave struct wrapping the hardware, have you thought of
something like that and how would your existing pxa2xx-spi driver will be
impacted?
And thanks for starting this thread:).
Actually, in my case I had to modify controller driver to support SPI in
master and slave mode as well, with standard transfers (half/full duplex
communication).
Regards,
Girish
>
>-------------------------------------------------------------------------
>This SF.net email is sponsored by: Splunk Inc.
>Still grepping through log files to find problems? Stop.
>Now Search log events and configuration files using AJAX and a browser.
>Download your FREE copy of Splunk now >> http://get.splunk.com/
>_______________________________________________
>spi-devel-general mailing list
>[email protected]
>https://lists.sourceforge.net/lists/listinfo/spi-devel-general
-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems? Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/
_______________________________________________
spi-devel-general mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/spi-devel-general
