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
