hm, try to disable events, I think it breaks something On 02/23/2016 05:19 PM, John Syne wrote: > Oops, I didn’t copy the complete config: > > CONFIG_IIO_DUMMY_EVGEN=m > CONFIG_IIO_SIMPLE_DUMMY=m > CONFIG_IIO_SIMPLE_DUMMY_EVENTS=y > CONFIG_IIO_SIMPLE_DUMMY_BUFFER=y > # CONFIG_IIO_SIMPLE_DUMMY_BUFFER_KFIFO is not set > CONFIG_IIO_SIMPLE_DUMMY_BUFFER_DMA=y > > Regards, > John > > > > >> On Feb 22, 2016, at 9:31 AM, Lars-Peter Clausen <lars@xxxxxxxxxx> wrote: >> >> On 02/22/2016 06:25 PM, John Syne wrote: >>> Hi Lars, >>> >>> It seems like there are other config selections that are selecting KFIFO so it seems to be enabled always. I can enable DMA buffer, but I will see how to disable KFIFO. When I get this working, should I see a waveform in IIO Oscilloscope? >> >> Hi, >> >> There is one for the dummy buffer. >> >> IIO_SIMPLE_DUMMY_BUFFER_DMA needs to be set and >> IIO_SIMPLE_DUMMY_BUFFER_KFIFO needs to be unset. >> >> - Lars >> >> >>> >>> Regards, >>> John >>> >>> >>> >>> >>>> On Feb 22, 2016, at 3:44 AM, Lars-Peter Clausen <lars@xxxxxxxxxx> wrote: >>>> >>>> On 02/22/2016 05:51 AM, John Syne 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. >>>>> >>>> >>>> Hi, >>>> >>>> The patch was dropped for now to avoid conflicts with other ongoing work on >>>> the dummy driver. The patch will come back in a slightly overhauled version >>>> soonish. >>>> >>>> As for your problem, make sure that you have the part of the patch which >>>> updates things so you can choose in Kconfig whether you want to use the DMA >>>> buffer or the KFIFO buffer. And then select the DMA buffer in your .config. >>>> >>>> - Lars >>>> >>>> >>>>> 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 >>> >> > > -- > 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
