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Message-ID: <1291292489-32362-2-git-send-email-michael.hennerich@analog.com> Date: Thu, 2 Dec 2010 13:21:27 +0100 From: <michael.hennerich@...log.com> To: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org CC: drivers@...log.com, jic23@....ac.uk, device-drivers-devel@...ckfin.uclinux.org, Michael Hennerich <michael.hennerich@...log.com> Subject: [RFC 1/3] IIO: Direct digital synthesis abi documentation From: Michael Hennerich <michael.hennerich@...log.com> Proposed ABI documentation Signed-off-by: Michael Hennerich <michael.hennerich@...log.com> --- .../staging/iio/Documentation/sysfs-bus-iio-dds | 103 ++++++++++++++++++++ 1 files changed, 103 insertions(+), 0 deletions(-) create mode 100644 drivers/staging/iio/Documentation/sysfs-bus-iio-dds diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio-dds b/drivers/staging/iio/Documentation/sysfs-bus-iio-dds new file mode 100644 index 0000000..2c99889 --- /dev/null +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio-dds @@ -0,0 +1,103 @@ + +What: /sys/bus/iio/devices/device[n]/ddsX_freqY +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Stores frequency into tuning word register Y. + There can be more than one ddsX_freqY file, which allows for + pin controlled FSK Frequency Shift Keying + (ddsX_pincontrol_freq_en is active) or the user can control + the desired active tuning word by writing Y to the + ddsX_freqsymbol file. + +What: /sys/bus/iio/devices/device[n]/ddsX_freq_scaleY +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Scale to be applied to ddsX_freqY in order to obtain the + desired value in Hz. If shared across all frequency registers + Y is not present. + +What: /sys/bus/iio/devices/device[n]/ddsX_freqsymbol +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Specifies the active output frequency tuning word. The value + corresponds to the Y in ddsX_freqY. To exit this mode the user + can write ddsX_pincontrol_freq_en or ddsX_out_disable file. + +What: /sys/bus/iio/devices/device[n]/ddsX_phaseY +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Stores phase into phase register Y. + There can be more than one ddsX_phaseY file, which allows for + pin controlled PSK Phase Shift Keying + (ddsX_pincontrol_phase_en is active) or the user can + control the desired phase Y which is added to the phase + accumulator output by writing Y to the en_phase file. + +What: /sys/bus/iio/devices/device[n]/ddsX_phase_scaleY +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Scale to be applied to ddsX_phaseY in order to obtain the + desired value in rad. If shared across all phase registers + Y is not present. + +What: /sys/bus/iio/devices/device[n]/ddsX_phasesymbol +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Specifies the active phase Y which is added to the phase + accumulator output. The value corresponds to the Y in + ddsX_phaseY. To exit this mode the user can write + ddsX_pincontrol_phase_en or disable file. + +What: /sys/bus/iio/devices/device[n]/ddsX_pincontrol_en +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Both, the active frequency and phase is controlled by the + respective phase and frequency control inputs. + +What: /sys/bus/iio/devices/device[n]/ddsX_pincontrol_freq_en +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + The active frequency is controlled by the respective + frequency control/select inputs. + +What: /sys/bus/iio/devices/device[n]/ddsX_pincontrol_phase_en +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + The active phase is controlled by the respective + phase control/select inputs. + +What: /sys/bus/iio/devices/device[n]/ddsX_out_disable +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Disables any signal generation on all outputs. + +What: /sys/bus/iio/devices/device[n]/ddsX_outY_disable +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Disables any signal generation on output Y. + +What: /sys/bus/iio/devices/device[n]/ddsX_outY_wavetype +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Specifies the output waveform. + (sine, triangle, ramp, square, ...) + For a list of available output waveform options read + available_output_modes. + +What: /sys/bus/iio/devices/device[n]/ddsX_outY_available_wavetypes +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + Lists all available output waveform options. -- 1.6.0.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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