Hi<div><br></div><div>I probe the program, you were right you can specify the device and it just work(attached example).</div><div>The controller have 3 chip selectors for the SPI (three slaves), although you can only connect two devices according to this: <a href="http://elinux.org/RPi_SPI">http://elinux.org/RPi_SPI</a>. You can confirm it with "ls /dev" command, there are only two SPI devices.</div><div>I read in some forum (can't remember which ones) this is due to how the library was written leaving out the third chip selector.</div><div><br></div><div> At the present time the only way to connect more SPI devices is: write your own SPI library (maybe with wiringPi) and use the GPIO's general purpose(pardon the redundancy) pins like selectors. It would be nice we can use the third selector with another "/dev/spidev0.2" in that way the external does not have to be modified and 24 analog inputs would be very good.</div><div><br></div><div>Luis G</div><div><br>On mié, jul 8, 2015 at 3:49 , Ivica Ico Bukvic <ico@vt.edu> wrote:<br>
<blockquote type="cite"><div class="plaintext" style="white-space: pre-wrap;">Hi Luis,
I am not 100% sure but if I recall correctly, you can specify which device you wish to open, so as long as each device is assigned a different /dev node, this should work just fine. I would appreciate it if you would please report your results and let us know. Alternately, there are larger D/A converters that provide you with more inputs, but will also require a customized version of disis_spi.
Hope this helps!
Best,
Ico
On 7/7/2015 11:41 PM, Luis G Angel wrote:
<blockquote>Hi list
I want to use two MCP3008 in order to connect 16 analog inputs to the Pi2, so my question is if the [disis_spi] is capable to manage 2 slaves.
If it is, how it should be the patch to manage that.
Thanks for any idea
Luis G
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</div>Ivica Ico Bukvic, D.M.A.
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Virginia Tech
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