Re: IIO Drivers

[Lars-Peter Clausen <lars@metafoo.de>]

On 02/27/2013 07:28 PM, Jonathan Cameron wrote:
> On 02/27/2013 05:36 PM, Chris Micali wrote:
>> lars, 
>>
>> I was under the impression that flag gets added automatically by iio_triggered_buffer_setup (industrialiio-triggers.c:77) - I actually am now able to enable the scan_element after changing my channel .channel and .scan_index to 0 (trying to match exactly the other drivers.)
> 

Yea, you are right I missed the iio_triggered_buffer_setup part.

> Strange, scan_index should have defaulted to zero and the .channel value shouldn't have mattered
> for buffered reads (just effects naming).  Might have caused issues with userspace expecting a channel 0
> though...

I guess the scan_index had nothing to do with this, but I suggested to set
scan_elements/in_voltage0_en to 1, so this clearly wouldn't have worked with
.channel being 1.

> 
>>  When i run general_buffer (from the docs dir) with that scan element enabled it can no longer read the trigger (Could not open /trigger/current_trigger  Failed to write current_trigger file) - this succeeds if that scan_element is not enabled.  

You can't change the trigger if the buffer is currently enabled. Make sure that
he buffer is disabled (check the buffer/enable attribute).

- Lars
u