Driver for ADC088S052
Hi,
I need a driver for an ADC088S052 (National Semiconductor). This is an 8-bit successive-approximation A/D converter with 8 multiplexed inputs and an SPI interface.
It's relatively new, and Google doesn't report anything useful for Linux. So I don't have much hope, but I try it anyway:
Is anybody working on a driver for that chip, or knows of such a project? Any other hints?
Thanks,
Hans
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
Hi Hans,
Quoted 9 lines
Hi,
I need a driver for an ADC088S052 (National Semiconductor). This is an 8-bit successive-approximation A/D converter with 8 multiplexed inputs and an SPI interface.
It's relatively new, and Google doesn't report anything useful for Linux. So I don't have much hope, but I try it anyway:Is anybody working on a driver for that chip, or knows of such a project? Any other hints?
Whilst I'm not aware of a driver for that particular chip, it has a very simple interface so a basic driver would be relatively straight forward. As far as I can tell from a quick read it's just a case of doing full duplex 16 bit transfers with a few bits on the send specifying which channel to grab next?
However, as per the recent thread on this list and lkml, there are some issues with how and where to integrate such a driver with the main kernel that are somewhat dependent on what you want to do with it. (search for "accelerometer" to get the relevant discussion).
If your application is of the simple poll all inputs every now and then variety where a sysfs "readall" attribute would do the job then it should be straight forward to write such a driver from scratch. Perhaps you could give us a few more details of the application / requirements?
Jonathan
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
A message that is not in the archive (sent off-list or not yet received): 4845843E.2040000-KWPb1pKIrIJaa/[email protected]
Quoted 1 line · Jonathan Cameron
Hi Hans,
Hi Jonathan,
Quoted 7 lines
Quoted 7 lines
Hi,
I need a driver for an ADC088S052 (National Semiconductor). This is an 8-bit successive-approximation A/D converter with 8 multiplexed inputs and an SPI interface.
It's relatively new, and Google doesn't report anything useful for Linux. So I don't have much hope, but I try it anyway:
Quoted 7 lines
Quoted 2 lines
Is anybody working on a driver for that chip, or knows of such a project? Any other hints?
Whilst I'm not aware of a driver for that particular chip, it has a very simple interface so a basic driver would be relatively straight forward. As far as I can tell from a quick read it's just a case of doing full duplex 16 bit transfers with a few bits on the send specifying which channel to grab next?
Yep, looks like that.
Quoted 5 lines
However, as per the recent thread on this list and lkml, there are some issues with how and where to integrate such a driver with the main kernel that are somewhat dependent on what you want to do with it. (search for "accelerometer" to get the relevant discussion).
Yes, I read that thread and gave my opinion as well. I'm aware of the problem, and we'll probably have some discussion again where to put the driver files and the Kconfig entries...
Quoted 4 lines
If your application is of the simple poll all inputs every now and then variety where a sysfs "readall" attribute would do the job then it should be straight forward to write such a driver from scratch.
It is, I already wrote a basic skeleton. For _me_ it's sufficient to poll the inputs every now and then, but the chip could do much faster things. It has up to 500ksamples/sec, and if somebody wants to use that for some scope app, we'd need some other design. But it would be possible to add a char device on top of the basic SPI driver later that adds some ring buffer and a read() function.
Thanks,
Hans
-------------------------------------------------------------------------
Check out the new SourceForge.net Marketplace.
It's the best place to buy or sell services for
just about anything Open Source.
http://sourceforge.net/services/buy/index.php