I apologize for the noise. I was right the first time. It is iio_simple_dummy_buffer_dma.c that isn’t getting called, but I guess that should be done in the iio_simple_dummy.c probe function. Is that correct? Regards, John > On Feb 21, 2016, at 11:34 PM, John Syne <john3909@xxxxxxxxx> wrote: > > Sorry, that should be “iio_simple_dummy_configure_buffer” isn’t called. > > Regards, > John > > > > >> On Feb 21, 2016, at 8:57 PM, John Syne <john3909@xxxxxxxxx> wrote: >> >> Seems like “iio_simple_dummy_configure_buffer_dma" never gets called and that is why the demo doesn’t work. >> >> Regards, >> John >> >> >> >> >>> On Feb 21, 2016, at 8:51 PM, John Syne <john3909@xxxxxxxxx> wrote: >>> >>> BTW, I seem to remember that Lars removed iio_simple_dummy_buffer_dma.c in his V3 patch so this won’t be in the IIO repo, but I don’t know how to test the IIO DMA framework without this file. >>> >>> Regards, >>> John >>> >>> >>> >>> >>>> On Feb 21, 2016, at 8:41 PM, John Syne <john3909@xxxxxxxxx> wrote: >>>> >>>> Hi, >>>> >>>> I am interested in using the IIO DMA framework and tried to use your dummy driver. >>>> >>>> I attempting to get the iio_dummy working with dma and seem to be having sum difficulty. >>>> >>>> Here is what I have done so far: >>>> >>>> I’m working on a BeagleBoneBlack running a 4.1 Linux Kernel. I have back ported the latest IIO code from git://git.kernel.org/pub/scm/linux/kernel/git/jic23 >>>> >>>> As a test I tried ti_am335x_adc.ko and enabled in_voltage0_en and then enabled the buffer. Reading from /dev/iio:device0 provided the waveform of the signal generator I had connected to ADC0 on the board. I was even able to run iiod and then connected IIO Oscilloscope which showed the same waveform. I did get a message WARNING: High-speed mode not enabled, but I guess there is no mmap in the driver and that is probably the issue. >>>> >>>> In linux config, I have enabled the following: >>>> CONFIG_IIO_SIMPLE_DUMMY_EVENTS >>>> CONFIG_IIO_SIMPLE_DUMMY_BUFFER >>>> CONFIG_IIO_SIMPLE_DUMMY_BUFFER_DMA >>>> CONFIG_IIO_BUFFER_CB >>>> CONFIG_IIO_BUFFER_DMA >>>> CONFIG_IIO_BUFFER_DMAENGINE >>>> CONFIG_IIO_KFIFO_BUF >>>> CONFIG_IIO_TRIGGERED_BUFFER >>>> CONFIG_IIO_TRIGGER >>>> CONFIG_IIO_CONSUMERS_PER_TRIGGER 2 >>>> >>>> When I "modprobe iio_dummy”, the following modules are loaded: >>>> >>>> industrialio >>>> industrialio_buffer_dma >>>> iio_dummy >>>> kfifo_buf >>>> iio_dummy_evgen >>>> >>>> I then modprobe iio_trig_sysfs which gives me /sys/bus/iio/device/iio_sysfs_trigger. To create a trigger I did: >>>> >>>>> echo 1 > /sys/bus/iio/device/iio_sysfs_trigger/add_trigger >>>>> cat name /sys/bus/iio/device/trigger0/name >>>>> sysfstrig1 >>>>> echo sysfstrig1 > /sys/bus/iio/device/iio:device0/trigger/current_trigger >>>> >>>> Now to enable a measurement: >>>> >>>>> echo 1 > /sys/bus/iio/device/iio:device0/scan_elements/in_voltage0_en >>>> >>>> Finally to enable the buffer: >>>> >>>>> echo 1 /sys/bus/iio/device/iio:device0/buffer/enable >>>> >>>> When I read "/dev/iio:device0" I get nothing. Connecting IIO Oscilloscope I get the following error message: >>>> >>>> WARNING: High-speed mode not enabled >>>> ERROR: Reading from device failed: -110 >>>> Client Exited >>>> >>>> In iio_simple_dummy_buffer_dma.c, I see iio_dummy_dma_source which generates a rect, sine, tri and saw waveforms. Not sure what I need to do to get these waveforms to generate. Is this demo functional? >>>> >>>> >>>> Regards, >>>> John >>>> >>>> >>>> >>>> >>> >> > -- 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
