On 31/08/15 17:01, Greg Wilson-Lindberg wrote: > > >> -----Original Message----- >> From: Michael Welling [mailto:mwelling79@xxxxxxxxx] On Behalf >> Of Michael Welling >> Sent: Friday, August 28, 2015 5:32 PM >> To: Greg Wilson-Lindberg >> Cc: linux-iio@xxxxxxxxxxxxxxx >> Subject: Re: Adding MAX1363 to BBB >> >> On Fri, Aug 28, 2015 at 04:56:20PM -0700, Greg Wilson-Lindberg wrote: >>> >>> I've got the system running, but I get an invalid argument >> error on the call to iio_buffer_refill(). I'm basically >> using the same code as for the tsadc, just added in a fourth >> channel, and none of the setup calls are returning errors, >> but the first iio_buffer_refill() call returns an error. >> I've dumped out the parameter that is being passed to the >> iio_buffer_refill() call and it is the same as the value that >> was returned from the iio_device_create_buffer() call. >>> >>> I've looked at the libiio source and I don't see anything >> obvious that should return invalid argument for the >> iio_buffer_refill() call. >>> >> >> I believe that you need to register an interrupt for buffered >> access to work. >> >> Do you have an interrupt connected and registered? >> > > Nope, no interrupt. So I guess I would need to ask, how would I register the interrupt in the Device Tree? The max1363 (and similar) don't have a dataready interrupt as they are clocked of the actual clock cycles of the i2c transfers. So they only read on demand. > > Or, alternatively, can I just get individual readings through IIO? Either via sysfs, or by adding a sysfs trigger and poking that. To add a sysfs trigger you'll need to probe the module, then poke a number into the add_trigger attribute to create a trigger which can then be associated with the max1363 (as normal). Then to 'fire' the trigger write to the trigger_now attribute of the relevant trigger. Ideally Daniel will be back soonish with a final version of the high resolution timer trigger that would also work well here. (it's rather tied up with some configfs support which wis trickier!). Jonathan > -- > To unsubscribe from this list: send the line "unsubscribe linux-iio" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
